CN108304147A - Two tone image generation method and device - Google Patents

Abstract

The invention provides a two-color image generation method and device. The two-color image generation method of the present invention includes: acquiring the initial brightness value of each pixel in the color image. According to the type of the color image, the brightness value of the first designated color and the brightness value of the second designated color are determined. According to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, color replacement processing is performed on each initial brightness value to obtain each target brightness value of the two-color image. The invention can set the color of the two-color image according to the color specified by the user, and can also improve the quality of the two-color conversion process.

Description

Two-color image generation method and device

technical field

The present invention relates to the field of printing technology, in particular to a method and device for generating a two-color image.

Background technique

Multi-color printers can perform graphic processing on color images formed by input data to obtain color printed documents. For most printing materials, two-color printing can meet the actual needs.

In the existing method for generating a two-color image, a multi-color printer generates a two-color image document by dividing the color image into two different colors according to the difference in color depth. However, in the existing two-color image generation method, the light color is easy to generate white, and the dark color is easy to generate black, and then the generated two-color image document may have inaccurate color reproduction and the like.

Contents of the invention

The invention provides a two-color image generation method and device to solve the problem of inaccurate color restoration caused by replacing the color image with the two-color image according to the difference in color depth in the existing two-color image generation method.

In a first aspect, the present invention provides a method for generating a two-color image, comprising:

Get the initial brightness value of each pixel in the color image;

determining the brightness value of the first specified color and the brightness value of the second specified color according to the type of the color image;

According to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, perform color replacement processing on each initial brightness value to obtain each target brightness value of the two-color image.

Optionally, according to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, performing color replacement processing on each initial brightness value to obtain each target brightness value of the two-color image ,include:

According to each initial brightness value and the brightness value of the first designated color, or according to each initial brightness value and the brightness value of the second designated color, perform color region division on each initial brightness value to obtain a first designated color region and a second specified color region;

Color replacement processing is performed on each initial brightness value of the first designated color area and each initial brightness value of the second designated color area to obtain each target brightness value of the two-color image.

Optionally, when there is one color channel corresponding to the first designated color, according to each initial brightness value and the brightness value of the first designated color, each initial brightness value is divided into color regions to obtain the first A specified color area and a second specified color area, including:

When the sum of the differences between the color channel value corresponding to the first designated color and the remaining color channel values in the initial brightness value satisfies the first preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the the first designated color area;

When the sum of the differences between the color channel value corresponding to the first designated color and the remaining color channel values in the initial brightness value does not meet the first preset range, determine the pixel point corresponding to the initial brightness value Belongs to said second designated color zone;

When the color channel corresponding to the first designated color is one, according to the initial brightness values and the brightness value of the second designated color, each initial brightness value is divided into color regions to obtain the first designated color region and a second specified color region, consisting of:

When the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value does not meet the second preset range, determine that the pixel point corresponding to the initial brightness value belongs to the the first designated color area;

When the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value satisfies the second preset range, it is determined that the pixel point corresponding to the initial pixel belongs to the the second specified color area.

Optionally, when the number of color channels corresponding to the first designated color is 2 or more, the color region is performed on each initial brightness value according to each initial brightness value and the brightness value of the first designated color. Divide to obtain the first specified color area and the second specified color area, and also include:

When the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color satisfies a third preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the the first designated color area;

When the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color does not meet the third preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the the second designated color area;

When the number of color channels corresponding to the second specified color is 2 or greater, the initial luminance values are divided into color regions according to the initial luminance values and the luminance values of the second specified color, to obtain the first luminance value. A specified color area and a second specified color area, including:

When the sum of the difference between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color does not meet the fourth preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the the first designated color area;

When the sum of the difference between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color satisfies the fourth preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the The second specifies the color region.

Optionally, performing color replacement processing on each initial brightness value of the first designated color area and each initial brightness value of the second designated color area to obtain each target brightness value of a two-color image, including:

When the first specified color is a color, set the color channel value corresponding to the first specified color in the initial brightness value of the first specified color area as the maximum color channel value, and set the first specified color to The rest of the color channel values in the initial brightness value of the color area are all set as the first preset color channel value to obtain the target brightness value of the two-color image;

When the second specified color is a color, set the color channel value corresponding to the second specified color in the initial brightness value of the second specified color area as the maximum color channel value, and set the second specified color to The remaining color channel values in the initial brightness value of the color area are all set to the second preset color channel value to obtain the target brightness value of the two-color image; or,

When the second designated color is an achromatic color, all color channel values in the initial brightness value of the second designated color area are set as the third preset color channel value to obtain the target brightness value of the two-color image.

Optionally, the first preset color channel value and the second preset color channel value are any one of the maximum value, minimum value and average value of all color channel values in the initial brightness value, the The third preset color channel value is a minimum value or an average value of all color channel values in the initial brightness value.

Optionally, the method also includes:

Acquiring target brightness values satisfying a preset condition in the two-color image obtained, wherein the preset condition is that all color channel values in the target brightness value are extreme values of color channel values, and the target brightness All color channel values in the initial brightness value corresponding to the value are not all equal;

Perform color correction processing on the target brightness value, and replace the target brightness value with the corrected brightness value.

Optionally, performing color correction processing on each target brightness value includes:

Setting the color channel value corresponding to the first specified color in the target brightness value as the maximum color channel value, and setting the remaining color channel values as the fourth preset color channel value; or

Set the color channel value corresponding to the second specified color in the target brightness value as the maximum color channel value, and set the other color channel values as the fifth preset color channel value.

Optionally, the fourth preset color channel value is a minimum value or an average value of all color channel values in the initial brightness value corresponding to the target brightness value.

In a second aspect, the present invention provides a two-color image generating device, comprising:

An acquisition module, configured to acquire the initial brightness value of each pixel in the color image;

A determination module, configured to determine the brightness value of the first specified color and the brightness value of the second specified color according to the type of the color image;

The processing module is configured to perform color replacement processing on each initial brightness value according to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, so as to obtain each target brightness value of the two-color image.

Optionally, the processing module includes: a division unit and a replacement unit;

The dividing unit is configured to divide each initial brightness value into a color region according to each initial brightness value and the brightness value of the first designated color, or according to each initial brightness value and the brightness value of the second designated color , get the first specified color area and the second specified color area;

The replacement unit is configured to perform color replacement processing on each initial brightness value of the first designated color region and each initial brightness value of the second designated color region to obtain each target brightness value of the two-color image.

Optionally, the dividing unit is specifically configured to, when there is one color channel corresponding to the first designated color, the value of the color channel corresponding to the first designated color and other colors in the initial brightness value When the sum of the differences of the channel values satisfies the first preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the first designated color area;

When the sum of the differences between the color channel value corresponding to the first designated color and the remaining color channel values in the initial brightness value does not meet the first preset range, determine the pixel point corresponding to the initial brightness value Belongs to said second designated color zone;

When there is one color channel corresponding to the second specified color, the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value does not satisfy the second predetermined value. When setting the range, it is determined that the pixel point corresponding to the initial brightness value belongs to the first specified color area;

When the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value satisfies the second preset range, it is determined that the pixel point corresponding to the initial pixel belongs to the the second specified color area.

Optionally, the dividing unit is specifically further configured to, when the number of color channels corresponding to the first designated color is 2 or greater, the value of each color channel of the initial brightness value and the first designated color When the sum of the difference values of the respective color channel values corresponding to the color satisfies a third preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the first designated color area;

When the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color does not meet the third preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the the second designated color area;

When the number of color channels corresponding to the second designated color is 2 or more than 2, the sum of the differences between the values of the respective color channels of the initial brightness value and the values of the respective color channels corresponding to the second designated color is not When the fourth preset range is satisfied, it is determined that the pixel corresponding to the initial brightness value belongs to the first designated color region;

When the sum of the difference between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color satisfies the fourth preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the The second specifies the color region.

Optionally, the replacement unit is specifically configured to set the color channel value corresponding to the first specified color in the initial brightness value of the first specified color region when the first specified color is a color The maximum color channel value, and the remaining color channel values in the initial brightness value of the first specified color area are all set as the first preset color channel value to obtain the target brightness value of the two-color image;

When the second specified color is a color, set the color channel value corresponding to the second specified color in the initial brightness value of the second specified color area as the maximum color channel value, and set the second specified color to The remaining color channel values in the initial brightness value of the color area are all set to the second preset color channel value to obtain the target brightness value of the two-color image; or,

When the second designated color is an achromatic color, all color channel values in the initial brightness value of the second designated color area are set as the third preset color channel value to obtain the target brightness value of the two-color image.

Optionally, the first preset color channel value and the second preset color channel value are any one of the maximum value, minimum value and average value of all color channel values in the initial brightness value, the The third preset color channel value is a minimum value or an average value of all color channel values in the initial brightness value.

Optionally, the method also includes:

The obtaining module is also used to obtain the obtained target brightness value satisfying a preset condition in the two-color image, wherein the preset condition is that all color channel values in the target brightness value are color channel values Extreme value, and all color channel values in the initial brightness value corresponding to the target brightness value are not all equal;

A correction module, configured to perform color correction processing on the target brightness value, and replace the target brightness value with a corrected brightness value.

Optionally, the correction module is specifically configured to set the color channel value corresponding to the first specified color in the target brightness value as the maximum color channel value, and set the remaining color channel values as the fourth preset color channel value; or,

Set the color channel value corresponding to the second specified color in the target brightness value as the maximum color channel value, and set the other color channel values as the fifth preset color channel value.

Optionally, the fourth preset color channel value is a minimum value or an average value of all color channel values in the initial brightness value corresponding to the target brightness value.

In a third aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the two-color image generation method described in the first aspect is implemented.

In a fourth aspect, the present invention provides a two-color image generating device, comprising:

processor; and

a memory for storing executable instructions of the processor;

Wherein, the processor is configured to execute the two-color image generation method described in the first aspect by executing the executable instructions.

The two-color image generation method and device provided by the present invention determine the brightness value of the first specified color or the brightness value of the second specified color according to the type of the color image by acquiring the initial brightness value of each pixel in the color image. Then, according to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, color replacement processing is performed on each initial brightness value to obtain each target brightness value of the two-color image. The invention solves the problem of inaccurate color restoration caused by replacing the color with two colors according to the difference in color depth in the existing two-color image generation method, and can specify the color of the two-color image according to the actual needs of users, and perform region division and color replacement processing on the color image , realizing the two-color conversion processing of the color image, and improving the quality of the two-color conversion.

Description of drawings

Fig. 1 is the flowchart one of the two-color image generating method provided by the present invention;

Fig. 2 is the second flow chart of the two-color image generation method provided by the present invention;

Fig. 3 is a flow chart three of the two-color image generation method provided by the present invention;

Fig. 4 is a structural schematic diagram 1 of a two-color image generating device provided by the present invention;

Fig. 5 is the second structural schematic diagram of the two-color image generating device provided by the present invention;

FIG. 6 is the third structural schematic diagram of the two-color image generating device provided by the present invention.

Detailed ways

Fig. 1 is the flowchart one of the two-color image generating method provided by the present invention, as shown in Fig. 1, the two-color image generating method of the present embodiment may include:

S101. Acquire an initial brightness value of each pixel in the color image.

Specifically, in this embodiment, the color image may be a corresponding color image obtained by the user inputting data through a user interface, and the user interface may be an operation panel, a driver interface, a web page, or an app interface of an image forming device such as a printer. Either. This embodiment does not limit it.

Furthermore, in this embodiment, the brightness value of each pixel on the color image needs to be confirmed, and the type of the color image is not limited in this embodiment. Optionally, the type data of the color image includes RGB image or CMYK image. For example, when the type of the color image is an RGB image, the brightness value of each pixel on the color image is an RGB value (r, g, b). When the type of the color image is a CMYK image, the brightness value of each pixel on the color image is a CMYK value (c, m, y, k).

Determining the initial brightness value of each pixel in the color image is a conventional technique for those skilled in the art, and will not be repeated here.

S102. Determine the brightness value of the first specified color and the brightness value of the second specified color according to the type of the color image.

Specifically, the two-color image in this embodiment is formed based on two colors specified by the user on the user interface of the image forming apparatus such as a printer. Specifically, the colors of the two-color image include a first specified color and a second specified color. In addition, in this embodiment, the first specified color may be selected as chromatic, and the second specified color is not limited. The chromatic color is a color other than black or gray, and the non-color is black or gray. For example, the user may set red as the first specified color and black as the second specified color, or the user may set red as the first specified color and blue as the second specified color. In this embodiment, the specific colors of the first specified color and the second specified color are not limited.

Further, since the printed document in this embodiment is two-color, the printed document after replacing the color image in this embodiment has only two colors, the first specified color and the second specified color, and this embodiment can According to the type of the color image, the brightness value of the first designated color or the brightness value of the second designated color is determined. This embodiment does not limit the specific implementation forms of the brightness value of the first designated color and the brightness value of the second designated color.

For example, when the type of the color image is an RGB image, if red is selected as the first specified color or the second specified color, the brightness value of red is the RGB value (255, 0, 0), where 255 is the value of the color channel The maximum value; if black is selected as the first specified color or the second specified color, the brightness value of black is the RGB value (0, 0, 0); if blue is selected as the first specified color or the second specified color, The brightness value of blue is the RGB value (0, 0, 255).

As another example, when the type of color image is a CMYK image, if red is selected as the first specified color or the second specified color, the brightness value of red is CMYK value (0, 100, 100, 0), where 100 is the color The maximum value of the channel value; if black is selected as the first specified color or the second specified color, the brightness value of black is the CMYK value (0, 0, 0, 100); if blue is selected as the first specified color or The second specified color, the brightness value of blue is CMYK value (100, 100, 0, 0).

S103. According to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, perform color replacement processing on each initial brightness value to obtain each target brightness value of the two-color image.

Specifically, in this embodiment, each initial brightness value can perform color replacement processing according to the brightness value of the first designated color and the brightness value of the second designated color, so that each initial brightness value becomes each target brightness value.

The two-color image generation method provided in this embodiment determines the brightness value of the first specified color or the brightness value of the second specified color according to the type of the color image by acquiring the initial brightness value of each pixel in the color image. Then, according to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, color replacement processing is performed on each initial brightness value to obtain each target brightness value of the two-color image. This embodiment solves the problem that the existing two-color image generation method replaces the color with two colors according to the difference in color depth and causes inaccurate color restoration. It can specify the color of the two-color image according to the actual needs of the user, and perform color replacement processing on the color image. The two-color conversion processing of the color image is improved, and the quality of the two-color conversion is improved.

On the basis of the above embodiments, the technical solution of the method for generating a two-color image in this embodiment will be described in detail.

First, in this embodiment, the specific implementation manner of performing color replacement processing on each initial brightness value to obtain each target brightness value of a two-color image is not limited. For the convenience of description, the specific implementation manner of the two-color image generation method of this embodiment will be described in detail below with reference to FIG. 2 .

Fig. 2 is the flow chart two of the two-color image generation method provided by the present invention, as shown in Fig. 2, the two-color image generation method of the present embodiment comprises:

S201. Acquire an initial brightness value of each pixel in the color image.

S202. Determine the brightness value of the first specified color and the brightness value of the second specified color according to the type of the color image.

Wherein, the implementation manners of S201 and S202 are similar to those of S101 and S102 in the embodiment of FIG. 1 , and will not be repeated here in this embodiment.

S203. According to each initial brightness value and the brightness value of the first designated color, or according to each initial brightness value and the brightness value of the second designated color, perform color region division on each initial brightness value, and obtain the first designated color region and the second designated color region. Two specifies the color area.

S204. Perform color replacement processing on each initial brightness value of the first designated color area and each initial brightness value of the second designated color area, respectively, to obtain each target brightness value of the two-color image.

Specifically, in this embodiment, the pixels in the color image can be divided into two areas, which are respectively the first specified color area and the second specified color area. For any pixel on the color image, this embodiment can determine whether the pixel corresponding to the initial brightness value is the first designated color area according to the first designated color and the initial brightness value. For example, when the first designated color is red, it is necessary to determine whether each pixel on the color image belongs to the red area. Wherein, this embodiment does not limit the specific size and specific form of the first preset range.

Further, when some pixels belong to the first specified color area, the remaining pixels belong to the second specified color area; when some pixels do not belong to the first specified color area, these pixels belong to the second specified color area , the rest of the pixels belong to the first specified color area.

Correspondingly, for any pixel point on the color image, this embodiment can also judge whether the pixel point corresponding to the brightness value belongs to the second designated color area by judging the initial brightness value and the second designated color. For example, when the second designated color is blue, it is necessary to determine whether each pixel on the color image belongs to the blue area. Wherein, this embodiment does not limit the specific size and specific form of the first preset range.

Further, when a part of the initial pixels belong to the second specified color area, the remaining part of the initial pixels belong to the first specified color area; when a part of the initial pixels do not belong to the second specified color area, this part of the initial pixels The points belong to the first designated color area, and the remaining initial pixel points belong to the second designated color area.

Further, since this embodiment can divide each pixel point on a color image into a first designated color area and a second designated color area, in this way, this embodiment can, according to the brightness value of the first designated color and each initial brightness value, Perform the replacement process of the first designated color on each initial pixel in the first designated color area, and perform a second replacement process on each initial pixel in the second designated color area according to the brightness value of the second designated color and each initial brightness value. The replacement process of the specified color makes the brightness value corresponding to any pixel point on the color image belong to the first specified color area or the second specified color area, realizing the conversion process from the color image to the two-color image.

The two-color image generation method provided in this embodiment determines the brightness value of the first specified color or the brightness value of the second specified color according to the type of the color image by acquiring the initial brightness value of each pixel in the color image. Then, according to each initial brightness value and the brightness value of the first designated color, or, according to each initial brightness value and the brightness value of the second designated color, each initial brightness value is divided into color regions to obtain the first designated color region and the second designated color region. Specifies the color region. Next, color replacement processing is performed on each initial brightness value of the first designated color area and each initial brightness value of the second designated color area to obtain each target brightness value of the two-color image. This embodiment solves the problem of inaccurate color reproduction caused by replacing the color with two colors according to the difference in color depth in the existing two-color image generation method, and can specify the color of the two-color image according to the actual needs of the user, and according to the color of each pixel in the color image In the color area, the color replacement process is performed on each brightness value corresponding to each pixel point to realize the conversion process from a color image to a two-color image, which improves the quality of the two-color conversion, and in this embodiment, the color area is firstly distinguished based on the color specified by the user. Then perform color replacement to improve the accuracy of color conversion.

Secondly, in this embodiment S203, according to each initial brightness value, the brightness value of the first specified color, and the brightness value of the second specified color, the pixel points corresponding to each initial brightness value in the color image can be divided into color regions to obtain the first Each initial brightness value of a designated color region and each initial brightness value of a second designated color region. In this embodiment, there are various specific manners for dividing the color regions of each pixel, which are not limited in this embodiment.

Specifically, when there is one color channel corresponding to the first specified color, the following two implementation manners may be used in this embodiment to describe in detail the specific process of dividing the color regions of each pixel.

In a feasible implementation, when the sum of the differences between the color channel value corresponding to the first specified color and the remaining color channel values in the initial brightness value satisfies the first preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the first A specified color area.

When the sum of the differences between the color channel value corresponding to the first designated color and the remaining color channel values in the initial brightness value does not meet the first preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the second designated color area.

Specifically, for any initial brightness value in a color image, the initial brightness value includes multiple color channel values, the multiple color channel values respectively correspond to different colors, and there is one color channel value or multiple color channel values and Corresponding to the first designated color, there is also a color channel value or multiple color channel values corresponding to the second designated color. For example, any initial brightness value in an RGB image includes three color channel values, and any initial brightness value in a CMYK image includes four color channel values.

Further, when one color corresponds to one color channel, this embodiment can make a difference between the color channel value corresponding to the first specified color and the remaining color channel values to obtain the sum of the differences, and then determine the sum of the differences Whether it is in the first preset range, if the sum of the differences satisfies the first preset range, it means that the initial brightness value belongs to the first designated color area; otherwise, the initial brightness value belongs to the second designated color area. Wherein, the value range of the first preset range in this embodiment can be set according to the actual situation, which is not limited in this embodiment.

Another feasible implementation is to determine the pixel corresponding to the initial brightness value when the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value does not meet the second preset range Belongs to the first designated color area.

When the sum of differences between the color channel value corresponding to the second designated color and the remaining color channel values in the initial brightness value satisfies a second preset range, it is determined that the pixel point corresponding to the initial pixel belongs to the second designated color area.

Correspondingly, this embodiment can also make a difference between the color channel value corresponding to the second designated color and other color channel values to obtain the sum of the differences, and then determine whether the sum of the differences is within the second preset range, if it is If the sum of the differences satisfies the second preset range, it means that the initial brightness value belongs to the second specified color area; otherwise, the initial brightness value belongs to the first specified color area. Wherein, in this embodiment, the value range of the second preset range can be set according to the actual situation, and in this embodiment, the second preset range and the first preset range can be equal or unequal. This is not limited.

It should be noted here that the difference in this embodiment is the difference after the absolute value, that is, the sum of the differences is generally greater than or equal to 0, and the subsequent descriptions about the difference all meet this condition, and will not be repeated in the future. .

For example, if red is selected as the first designated color, and the brightness value of red is (255, 0, 0), when the first preset range and the second preset range are set to be greater than 160, if the initial brightness of a certain pixel The value is (238, 58, 140), then (238-58)+(238-140)=278 satisfies the first preset range, so that the pixel belongs to the first specified color area. If the initial brightness value of a pixel is (0, 14, 39), then (14-0)+(39-0)=53, 53 does not meet the first preset range, so the pixel belongs to the second designation color area. Similarly, selecting red as the second specified color can also complete the division of color regions according to the above method.

Further, when the number of color channels corresponding to the first specified color is 2 or more, this embodiment may adopt the following two implementation manners to describe in detail the specific process of color region division for each pixel.

In a feasible implementation, when the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color satisfies a third preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the first specified color. a specified color area;

When the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color does not satisfy the third preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the second specified color area.

Specifically, when there are multiple color channels corresponding to one color, this embodiment can make a difference between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color to obtain the sum of the differences, and then determine Whether the sum of the differences is within the third preset range, if the sum of the differences satisfies the third preset range, it means that the initial brightness value belongs to the first designated color area, otherwise, the initial brightness value belongs to the second designated color area . Wherein, the value range of the third preset range in this embodiment can be set according to the actual situation, which is not limited in this embodiment.

In another feasible implementation manner, when the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color does not meet the fourth preset range, determine the pixel point corresponding to the initial brightness value Belongs to the first designated color zone;

When the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color satisfies a fourth preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the second specified color area,

Correspondingly, when there are multiple color channels corresponding to one color, this embodiment can make a difference between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color to obtain the sum of the differences, and then determine Whether the sum of the differences is in the fourth preset range, if the sum of the differences satisfies the fourth preset range, it means that the initial brightness value belongs to the second specified color area, otherwise, the initial brightness value belongs to the first specified color area . Wherein, the value range of the fourth preset range in this embodiment can be set according to the actual situation, which is not limited in this embodiment.

For example, if purple is selected as the first specified color, and the brightness value of purple is (255, 0, 255), when the first preset range and the second preset range are set to be greater than 160, if the initial brightness of a certain pixel If the value is (238, 58, 140), then (255-238)+(58-0)+(255-140)=190 satisfies the first preset range, so that the pixel belongs to the first designated color area. If the initial brightness value of a pixel is (255, 14, 201), then (255-255)+(14-0)+(255-201)=68 does not meet the first preset range, so the pixel Belongs to the second designated color area. Similarly, selecting purple as the second designated color can also complete the division of color regions according to the above method.

Further, in this embodiment, there is one color channel corresponding to the first specified color, and there are two or more color channels corresponding to the second specified color, which can also complete the color area division of each pixel. Similarly, there is one color channel corresponding to the second specified color, and there are two or more color channels corresponding to the first specified color, so that the color region division of each pixel can be completed. In this embodiment, the number of color channels corresponding to the first specified color and the second specified color is not limited.

Next, in S204 of this embodiment, the color replacement process is performed on each initial brightness value to obtain each target brightness value of the two-color image. There are many specific implementation manners, which are not limited in this embodiment. Those skilled in the art can understand that in the first case, when the first specified color is chromatic, the second specified color can be chromatic or achromatic. In the second case, when the second specified color is chromatic, the first specified color can be either chromatic or achromatic. In this embodiment, the first case is taken as an example to describe in detail the specific manner of obtaining each target brightness value of the two-color image.

On the one hand, when the first specified color is a color, set the color channel value corresponding to the first specified color in the initial brightness value of the first specified color area as the maximum color channel value, and set the initial brightness of the first specified color area to The remaining color channel values in the value are all set to the first preset color channel value to obtain the target brightness value of the two-color image.

Specifically, when the type of the color image is an RGB image, if it is determined that the pixel point corresponding to the initial brightness value belongs to the first designated color area, and the first designated color is red, the value of each color channel in the red brightness value is r The color channel value is 255, the color channel value of g and the color channel value of b are both 0 as an example, then in the target pixel value corresponding to the initial brightness value, the color channel value of r is 255, the color channel value of g and b’s The color channel value is the first preset color channel value. In this way, color replacement is performed on the initial brightness value of the pixel, so that the pixel corresponding to the target brightness value belongs to the red area.

Further, when the type of the color image is a CMYK image, if it is determined that the pixel point corresponding to the initial brightness value belongs to the first designated color area, and the first designated color is selected as red, the value of each color channel in the red brightness value is c The color channel value of and the color channel value of k are both 0, the color channel value of m and the color channel value of y are both 100 as an example, then the initial brightness value corresponds to the color channel value of m and the color of y in the target brightness value The channel values are both 100, the color channel value of c and the color channel value of k are the first preset color channel value, so that the initial brightness value of the pixel is replaced by color, so that the pixel corresponding to the target brightness value It belongs to the red area.

On the other hand, when the second specified color is chromatic, set the color channel value corresponding to the second specified color in the initial brightness value of the second specified color area as the maximum color channel value, and set the initial brightness value of the second specified color area to The rest of the color channel values in the brightness value are all set to the second preset color channel value to obtain the target brightness value of the two-color image.

When the second designated color is achromatic, all color channel values in the initial brightness value of the second designated color area are set to the third preset color channel value to obtain the target brightness value of the two-color image.

Specifically, when the type of the color image is an RGB image, if it is determined that the pixel point corresponding to the initial brightness value belongs to the second specified color area, and the second specified color is blue, the value of each color channel in the blue brightness value is The color channel value of r and the color channel value of g are both 0, and the color channel value of b is 255 as an example, then in the initial brightness value, the color channel value of b is 255, the color channel value of r and the color channel value of g are the second preset color channel values, so that the initial brightness value of the pixel is replaced by color, so that the pixel corresponding to the target brightness value belongs to the blue area.

Further, when the type of the color image is a CMYK image, if it is determined that the pixel point corresponding to the initial brightness value belongs to the second specified color area, and the second specified color is selected as blue, the value of each color channel in the blue brightness value The color channel value of c and the color channel value of m are both 100, the color channel value of y and the color channel value of k are both 0 as an example, then in the initial brightness value, the color channel value of c and the color channel value of m is 100, the color channel value of y and the color channel value of k are the second preset color channel value, so that the initial brightness value of the pixel is replaced by color, so that the pixel corresponding to the target brightness value belongs to blue area.

Further, when the type of the color image is an RGB image, if it is determined that the pixel corresponding to the initial brightness value belongs to the second specified color area, and the second specified color is black, then in the initial brightness value, the color channel value of r, b The color channel value of and the color channel value of g are both the third preset color channel value, so that the initial brightness value of the pixel is replaced by color, so that the pixel corresponding to the target brightness value belongs to the black area.

Further, when the type of the color image is a CMYK image, if it is determined that the pixel point corresponding to the initial brightness value belongs to the second specified color area, and the second specified color is selected as black, then in the initial brightness value, the color channel value of c, The color channel value of m, the color channel value of y and the color channel value of k are the third preset color channel value, so that the initial brightness value of the pixel is replaced by color, so that the pixel corresponding to the target brightness value belong to the black area.

Wherein, this embodiment does not limit the specific implementation manner and size of the first preset color channel value, the second preset color channel value, and the third preset color channel value. Optionally, the first preset color channel value and the second preset color channel value are any of the maximum value, minimum value and average value of all color channel values in the initial brightness value, and the third preset color channel value is The minimum or average of all color channel values in the initial luminosity value.

Finally, in the process of using the above color replacement to obtain a two-color image, some wrong white areas may appear in the pixels corresponding to each target brightness value, that is, when the brightness value of the initial pixel point in the color image is lighter, after color replacement processing Afterwards, it is easy to replace it with white pixels, thereby causing the image content to be lost and causing inconvenience to the user. Therefore, in order to improve the accuracy of color restoration, below in conjunction with FIG. 3, the specific implementation of the two-color image generation method in this embodiment Give a detailed explanation.

Fig. 3 is a flow chart three of the method for generating a two-color image provided by the present invention. As shown in Fig. 3, the method for generating a two-color image in this embodiment may include:

S301. Acquire an initial brightness value of each pixel in the color image.

S302. Determine the brightness value of the first specified color and the brightness value of the second specified color according to the type of the color image.

S303. According to each initial brightness value, the brightness value of the first specified color, and the brightness value of the second specified color, perform color replacement processing on each initial brightness value to obtain each target brightness value of the two-color image.

Wherein, S301, S302, and S303 are respectively similar to S101, S102, and S103 in the embodiment of FIG.

Further, in this embodiment, the color correction process is performed on the initial brightness value corresponding to the target brightness value, and there are many specific implementation methods for replacing the target brightness value with the corrected initial brightness value, which is not limited in this embodiment .

S304. Obtain the target brightness value satisfying the preset condition in the obtained two-color image, wherein the preset condition is that all the color channel values in the target brightness value are extreme values of the color channel values, and the target brightness value corresponds to an initial brightness value Not all color channel values in are equal.

S305. Perform color correction processing on the target brightness value, and replace the target brightness value with the corrected brightness value.

Specifically, the extreme values of the color channel values in this embodiment are not limited. When the color image type is RGB, the preset condition is that all the color channel values in the target brightness value are the maximum value of the color channel value, and all the color channel values in the initial pixel value corresponding to the target pixel value are not all equal; when the image type When it is CMYK, the preset condition is that all the color channel values in the target brightness value are the minimum value of the color channel value, and all the color channel values in the initial pixel value corresponding to the target pixel value are not all equal.

Furthermore, in the two-color image that has been obtained, this embodiment can obtain the target brightness corresponding to all color channel values that are extreme values of color channel values, and all color channel values in the initial brightness value corresponding to the target pixel value are not all equal Values, that is, these pixels become white pixels after color replacement processing. Therefore, this embodiment can perform color correction processing on these target brightness values, and replace the target brightness values with the corrected brightness values, so that these pixels Dots can be displayed in a two-color image, thereby solving the problem of color image content loss.

Optionally, set the color channel value corresponding to the first specified color in the target brightness value as the maximum color channel value, and set the remaining color channel values as the fourth preset color channel value; or,

Set the color channel value corresponding to the second specified color in the target brightness value as the maximum color channel value, and set the other color channel values as the fifth preset color channel value.

For example, when the color image type is RGB, when the first specified color is red, the pixel value of the pixel after the color replacement process is (255, 255, 255), but the pixel value of the corresponding initial pixel is (0 , 255, 255), since (255-0)+(255-0)=510, 510 satisfies the first preset range (such as greater than 160), that is, the corresponding initial pixel belongs to the red area, after color replacement, the The target pixel corresponding to the initial pixel is (255, 255, 255) which is an all-white pixel, which does not belong to the first color area, and the image content is lost. Therefore, color correction processing is required. Specifically, the target pixel The pixel value of (255, 255, 255) is corrected to (255, 0, 0), so that the color-corrected pixel and the corresponding initial pixel belong to the same color region.

Further, when the color image type is CMYK, when the first designated color is red, the CMYK value corresponding to red is (0, 100, 100, 0), and the pixel value of the pixel point processed by color replacement is (0, 0, 0, 0), but the pixel value of the corresponding initial pixel point is (0, 0, 100, 100), because (0-0)+(100-0)+(100-100)+(100-0 )=200, 200 satisfies the first preset range (such as greater than 160), that is, the corresponding initial pixel point belongs to the red area, after color replacement, the target pixel point corresponding to the initial pixel point is (0, 0, 0, 0 ) is an all-white pixel point, which does not belong to the first color area, and the image content is lost. Therefore, color correction processing is required, specifically, the pixel value (0, 0, 0, 0) of the target pixel point is corrected to ( 0, 100, 100, 0), so that the color-corrected pixel and the corresponding initial pixel belong to the same color region.

Wherein, this embodiment does not limit the specific implementation manners of the fourth preset color channel value and the fifth preset color channel value. Optionally, the fourth preset color channel value and the fifth preset color channel value are the minimum value or the average value of all the color channel values in the initial brightness value corresponding to the target brightness value.

Further, this embodiment can effectively correct the image corresponding to the white area that may appear in the two-color image, making each target brightness value more accurate, improving the image quality of the two-color image, and avoiding the phenomenon of color loss.

In a specific embodiment, the color image is an RGB image, and red and black are respectively the first specified color and the second specified color, according to whether the difference between each initial brightness value and the brightness value of red satisfies the first preset range , and both the first preset range and the second preset range are greater than 160, the first preset color channel and the second preset color channel are the maximum value of all color channel values in each initial brightness value as an example, for this implementation The two-color image generation method in the example is described in detail.

1. Obtain the initial brightness value of each pixel in the RGB image. If only three pixels are taken as an example, the initial brightness value of the first pixel is the RGB value (238, 48, 167) and the initial brightness of the second pixel The value is RGB value (92, 72, 38) and the initial brightness value of the third pixel is RGB value (72, 118, 255).

2. According to the type of the RGB image, determine that the brightness value of red is RGB value (255, 0, 0), and the brightness value of black is RGB value (0, 0, 0).

3. Calculate the initial luminance value of the first pixel. The sum of the difference between the color channel value corresponding to red and the remaining color channels in the RGB value (238, 48, 167) is (238-48)+(238-167) =261>160, if the first preset range is satisfied, then the first pixel point belongs to the red area.

Calculate the sum of the difference between the color channel value corresponding to red and the remaining color channels in the initial brightness value (92,72,38) of the second pixel point as (92-72)+(92-38)=74<160, If the first preset range is not satisfied, the second pixel belongs to the black area.

Calculate the sum of the difference between the color channel value corresponding to red and the remaining color channels in the initial brightness value (72, 118, 255) of the third pixel point as (118-72)+(255-72)=229, 229> 160. If the first preset range is met, the third pixel belongs to the red area.

4. Set the color channel value of r in the initial brightness value (238, 48, 167) of the first pixel to 255, the color channel value of g and the color channel value of b to 167, then the target of the first pixel Brightness values are (255, 167, 167).

Set the color channel value of r, the color channel value of g and the color channel value of b in the initial brightness value (92, 72, 38) of the second pixel to 92, then the target brightness value of the second pixel is ( 92, 92, 92).

Set the color channel value of r in the initial brightness value (72, 118, 255) of the third pixel to 255, set the color channel value of g and the color channel value of d to 255, then the third pixel's The target brightness value is (255, 255, 255).

5. Perform region division and color replacement processing on the rest of the initial brightness values in the color image according to steps 3 and 4, to obtain each target brightness value in the two-color image.

6. The target luminance value of the third pixel is marked as the luminance value of white, therefore, it is necessary to perform color correction processing on the target luminance value of the third pixel, and the initial luminance value of the third pixel (72, 118, 255 The color channel value of r in ) is set to 255, the color channel value of g and the color channel value of b are set to the minimum value of 118, then the third target brightness value is (255, 118, 118), which belongs to the red area.

An embodiment of the present invention provides a computer-readable storage medium, including: a readable storage medium and a computer program, the computer program is used to implement the technical solutions of the above-mentioned method embodiments of the present invention, and its implementation principle and technical effect are similar. Here, I won't repeat them here.

Fig. 4 is a schematic structural diagram of a two-color image generating device provided by the present invention. As shown in Fig. 4, the two-color image generating device of this embodiment may include:

An acquisition module 11, configured to acquire the initial brightness value of each pixel in the color image;

A determining module 12, configured to determine a brightness value of a first specified color and a brightness value of a second specified color according to the type of the color image;

A processing module 13, configured to perform color replacement processing on each initial brightness value according to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, to obtain each target brightness value of the two-color image .

Optionally, the processing module 13 includes: a division unit 131 and a replacement unit 132;

The dividing unit 131 is configured to carry out color division of each initial brightness value according to each initial brightness value and the brightness value of the first designated color, or according to each initial brightness value and the brightness value of the second designated color. Divide to obtain the first specified color area and the second specified color area;

The replacement unit 132 is configured to perform color replacement processing on each initial brightness value of the first designated color region and each initial brightness value of the second designated color region to obtain each target brightness value of the two-color image.

Optionally, the dividing unit 131 is specifically configured to, when there is one color channel corresponding to the first specified color, the value of the color channel corresponding to the first specified color in the initial brightness value and the rest When the sum of the differences of the color channel values satisfies the first preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the first designated color area;

When the sum of the differences between the color channel value corresponding to the first designated color and the remaining color channel values in the initial brightness value does not meet the first preset range, determine the pixel point corresponding to the initial brightness value Belongs to said second designated color zone;

When there is one color channel corresponding to the second specified color, the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value does not satisfy the second predetermined value. When setting the range, it is determined that the pixel point corresponding to the initial brightness value belongs to the first specified color area;

When the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value satisfies the second preset range, it is determined that the pixel point corresponding to the initial pixel belongs to the the second specified color area.

Optionally, the dividing unit 131 is specifically further configured to, when the number of color channels corresponding to the first designated color is 2 or greater, between each color channel value of the initial brightness value and the first color channel value When the sum of the difference values of the respective color channel values corresponding to the specified color satisfies a third preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the first specified color area;

When the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color does not meet the third preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the the second designated color area;

When the number of color channels corresponding to the second designated color is 2 or more than 2, the sum of the differences between the values of the respective color channels of the initial brightness value and the values of the respective color channels corresponding to the second designated color is not When the fourth preset range is satisfied, it is determined that the pixel corresponding to the initial brightness value belongs to the first designated color region;

When the sum of the difference between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color satisfies the fourth preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the The second specifies the color region.

Optionally, the replacement unit 132 is specifically configured to set the color channel value corresponding to the first specified color in the initial brightness value of the first specified color region when the first specified color is a color is the maximum color channel value, and the remaining color channel values in the initial brightness value of the first specified color area are all set as the first preset color channel value to obtain the target brightness value of the two-color image;

When the second specified color is a color, set the color channel value corresponding to the second specified color in the initial brightness value of the second specified color area as the maximum color channel value, and set the second specified color to The remaining color channel values in the initial brightness value of the color area are all set to the second preset color channel value to obtain the target brightness value of the two-color image; or,

When the second designated color is an achromatic color, all color channel values in the initial brightness value of the second designated color area are set as the third preset color channel value to obtain the target brightness value of the two-color image.

Optionally, the first preset color channel value and the second preset color channel value are any one of the maximum value, minimum value and average value of all color channel values in the initial brightness value, the The third preset color channel value is a minimum value or an average value of all color channel values in the initial brightness value.

Fig. 5 is a structural schematic diagram II of the two-color image generating device provided by the present invention. As shown in Fig. 5, the two-color image generating device of this embodiment further includes:

The acquiring module 11 is further configured to acquire target luminance values in the obtained two-color image that satisfy a preset condition, wherein the preset condition is that all color channel values in the target luminance value are color channel values , and all color channel values in the initial brightness value corresponding to the target brightness value are not all equal;

The correction module 14 is configured to perform color correction processing on the target brightness value, and replace the target brightness value with a corrected brightness value.

Optionally, the correction module 14 is specifically configured to set the color channel value corresponding to the first specified color in the target brightness value as the maximum color channel value, and set the remaining color channel values as the fourth preset color channel value; or,

When the second designated color is color, set the color channel value corresponding to the second designated color in the target brightness value as the maximum color channel value, and set the remaining color channel values as the fifth preset color channel value.

Optionally, the fourth preset color channel value and the fifth preset color channel value are a minimum value or an average value of all color channel values in the initial brightness value corresponding to the target brightness value.

The two-color image generation device of this embodiment can be used to implement the technical solution of the above-mentioned two-color image generation method embodiment, and its implementation principle and technical effect are similar, and will not be repeated here.

In the present invention, the functional modules of the two-color image generating device can be divided according to the above method example, for example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. It should be noted that the division of modules in each embodiment of the present invention is schematic, and is only a logical function division, and there may be other division methods in actual implementation.

Fig. 6 is a structural schematic diagram III of a two-color image generating device provided by the present invention. As shown in Fig. 6, the two-color image generating device of this embodiment may include:

processor 21; and

a memory 22, configured to store executable instructions of the processor 21;

Wherein, the processor 21 is configured to execute the above-mentioned two-color image generation method by executing the executable instructions.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (12)

1. A two-color image generation method, characterized in that, comprising: Obtain the initial brightness value of each pixel in the color image; determining the brightness value of the first specified color and the brightness value of the second specified color according to the type of the color image; According to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, perform color replacement processing on each initial brightness value to obtain each target brightness value of the two-color image. 2. The method according to claim 1, characterized in that, according to each initial brightness value, the brightness value of the first specified color and the brightness value of the second specified color, the initial brightness values are color-coded. Replacement processing to obtain each target brightness value of the two-color image, including: According to each initial brightness value and the brightness value of the first designated color, or according to each initial brightness value and the brightness value of the second designated color, perform color region division on each initial brightness value to obtain a first designated color region and a second specified color region; Color replacement processing is performed on each initial brightness value of the first designated color area and each initial brightness value of the second designated color area to obtain each target brightness value of the two-color image. 3. The method according to claim 2, wherein when the color channel corresponding to the first specified color is one, the initial brightness value and the brightness value of the first specified color are used for Each initial brightness value is divided into color regions to obtain the first designated color region and the second designated color region, including: When the sum of the differences between the color channel value corresponding to the first designated color and the remaining color channel values in the initial brightness value satisfies the first preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the the first designated color area; When the sum of the differences between the color channel value corresponding to the first designated color and the remaining color channel values in the initial brightness value does not meet the first preset range, determine the pixel point corresponding to the initial brightness value Belongs to said second designated color zone; When the color channel corresponding to the second designated color is one, according to each initial brightness value and the brightness value of the second designated color, each initial brightness value is divided into color regions to obtain a first designated color region and a second specified color region, consisting of: When the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value does not meet the second preset range, determine that the pixel point corresponding to the initial brightness value belongs to the the first designated color area; When the sum of the differences between the color channel value corresponding to the second specified color and the remaining color channel values in the initial brightness value satisfies the second preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the The second specifies the color region. 4. The method according to claim 2, wherein when the number of color channels corresponding to the first specified color is 2 or more than 2, the The brightness value is divided into color regions for each initial brightness value to obtain the first specified color region and the second specified color region, which also includes: When the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color satisfies a third preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the the first designated color area; When the sum of the differences between each color channel value of the initial brightness value and each color channel value corresponding to the first specified color does not meet the third preset range, it is determined that the pixel point corresponding to the initial brightness value belongs to the the second designated color area; When the number of color channels corresponding to the second specified color is 2 or greater, the initial luminance values are divided into color regions according to the initial luminance values and the luminance values of the second specified color, to obtain the first luminance value. A specified color area and a second specified color area, including: When the sum of the difference between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color does not meet the fourth preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the the first specified color area; When the sum of the difference between each color channel value of the initial brightness value and each color channel value corresponding to the second specified color satisfies the fourth preset range, it is determined that the pixel corresponding to the initial brightness value belongs to the The second specifies the color region. 5. The method according to claim 2, wherein the color replacement process is carried out to each initial brightness value of the first designated color region and each initial brightness value of the second designated color region respectively, to obtain Each target brightness value of a two-color image, including: When the first specified color is a color, set the color channel value corresponding to the first specified color in the initial brightness value of the first specified color area as the maximum color channel value, and set the first specified color to The rest of the color channel values in the initial brightness value of the color area are all set as the first preset color channel value to obtain the target brightness value of the two-color image; When the second specified color is a color, set the color channel value corresponding to the second specified color in the initial brightness value of the second specified color area as the maximum color channel value, and set the second specified color to The remaining color channel values in the initial brightness value of the color area are all set to the second preset color channel value to obtain the target brightness value of the two-color image; or, When the second designated color is an achromatic color, all color channel values in the initial brightness value of the second designated color area are set as the third preset color channel value to obtain the target brightness value of the two-color image. 6. The method according to claim 5, wherein the first preset color channel value and the second preset color channel value are the maximum value and the minimum value of all color channel values in the initial brightness value value and the average value, the third preset color channel value is the minimum value or the average value of all the color channel values in the initial brightness value. 7. The method according to claim 1, further comprising: Acquiring target brightness values satisfying a preset condition in the two-color image obtained, wherein the preset condition is that all color channel values in the target brightness value are extreme values of color channel values, and the target brightness All color channel values in the initial brightness value corresponding to the value are not all equal; Perform color correction processing on the target brightness value, and replace the target brightness value with the corrected brightness value. 8. The method according to claim 7, wherein said performing color correction processing on each target brightness value comprises: Set the color channel value corresponding to the first specified color in the target brightness value as the maximum color channel value, and set the remaining color channel values as the fourth preset color channel value; or, Set the color channel value corresponding to the second specified color in the target brightness value as the maximum color channel value, and set the other color channel values as the fifth preset color channel value. 9. The method according to claim 8, wherein the fourth preset color channel value is a minimum value or an average value of all color channel values in the initial brightness value corresponding to the target brightness value. 10. A two-color image generating device, comprising: An acquisition module, configured to acquire the initial brightness value of each pixel in the color image; A determination module, configured to determine the brightness value of the first specified color and the brightness value of the second specified color according to the type of the color image; The replacement module is configured to perform color replacement processing on each initial brightness value according to each initial brightness value, the brightness value of the first designated color, and the brightness value of the second designated color, so as to obtain each target brightness value of the two-color image. 11. A computer-readable storage medium, on which a computer program is stored, wherein when the computer program is executed by a processor, the method for generating a two-color image according to any one of claims 1-9 is realized. 12. A two-color image generating device, comprising: processor; and a memory for storing executable instructions of the processor; Wherein, the processor is configured to execute the two-color image generation method according to any one of claims 1-9 by executing the executable instructions.