CN101630501A - Method and system for displaying image - Google Patents

Abstract

The present invention is applicable to the field of image processing, and provides an image display method and system. The method includes the following steps: calculating the pixel points in the source image mapped to the physical display device according to the coordinate values of the pixel points in the source image. Coordinate value; according to the coordinate value of the pixel in the source image mapped to the physical display device, and the color depth value and resolution of the physical display device, calculate the position of the pixel in the source image in the video memory of the physical display device , and store the pixels in the source image to the positions of the pixels in the video memory of the physical display device; display the pixels stored in the video memory of the physical display device on the physical display device. In the embodiment of the present invention, when replacing a physical display device with a different resolution or a different color space, only the corresponding interface of the image display method needs to be modified, which has good portability and reduces the difficulty of maintenance.

Description

Image display method and system

technical field

The invention belongs to the field of image processing, and in particular relates to an image display method and system.

Background technique

In the field of image display, existing image display methods generally adopt a two-layer architecture, that is, a source image layer and a physical display layer. When displaying the source image on the physical display device, the existing image display method is to directly display the source image on the physical display device. In this image display method, since the source image is directly displayed on the physical display device, when a physical display device with a different resolution or a different color space is replaced, the image display method needs to be redesigned, so that the image display method can Poor portability, difficult maintenance, and inconvenience to developers.

Contents of the invention

The purpose of the embodiments of the present invention is to provide an image display method, aiming at solving the problems of poor portability and difficult maintenance in the existing image display method.

The embodiment of the present invention is achieved in this way, an image display method, the method includes the following steps:

Calculate the coordinate values of the pixels in the source image mapped to the physical display device according to the coordinate values of the pixels in the source image;

According to the coordinate values of the pixel points in the source image mapped to the physical display device, and the color depth value and resolution of the physical display device, calculate the position of the pixel point in the source image in the video memory of the physical display device, and set The pixels in the source image are stored to the positions of the pixels in the video memory of the physical display device;

Display the pixels stored in the video memory of the physical display device on the physical display device.

Another object of the embodiments of the present invention is to provide an image display system, the system comprising:

A pixel mapping unit, configured to calculate the coordinate values of each pixel in the source image mapped to the physical display device according to the coordinate values of each pixel in the source image;

A video memory position calculation unit, used to calculate the position of each pixel in the source image in the video memory of the physical display device according to the coordinate value calculated by the pixel mapping unit, and the resolution and color depth value of the physical display device, and The color value of each pixel in the source image is stored to the calculated position in the corresponding video memory;

The image display unit is configured to display the pixels stored in the video memory of the physical display device on the physical display device.

In the embodiment of the present invention, the coordinate value of the pixel point in the source image mapped to the physical display device is calculated, and the pixel point of the source image is calculated according to the coordinate value, the color depth value and the resolution of the physical display device. The location in the video memory of the display device, so that when replacing a physical display device with a different resolution or a different color space, only the corresponding interface in the logic processing layer needs to be modified, which has good portability and reduces the difficulty of maintenance.

Description of drawings

FIG. 1 is a flowchart of an implementation of an image display method provided by an embodiment of the present invention;

Fig. 2 is a flow chart for realizing the mapping of each pixel in the calculation source image to the coordinate value on the physical display device provided by the embodiment of the present invention;

Fig. 3 is a flow chart for realizing the mapping of the initial display pixel point of the calculation source image to the coordinate value on the physical display device provided by the embodiment of the present invention;

Fig. 4 is a schematic diagram of Cartesian coordinates of an initial source image provided by an embodiment of the present invention;

Fig. 5 is a schematic diagram of Cartesian coordinates for setting the display area of the source image in the initial meta image provided by the embodiment of the present invention;

FIG. 6 to FIG. 9 are schematic diagrams of mapping the initial display pixel point of the source image to the physical display device provided by the embodiment of the present invention;

Fig. 10 is an implementation flowchart of calculating the position of each pixel in the source image in the video memory of the physical display device provided by the embodiment of the present invention;

Fig. 11 is an implementation flow chart of performing precision conversion on a pixel in a source image to obtain a new color value of the pixel provided by an embodiment of the present invention;

Fig. 12 is a schematic diagram of precision conversion of component values of color values of pixels provided by an embodiment of the present invention;

Fig. 13 is a schematic diagram of the architecture of an image display system provided by an embodiment of the present invention;

FIG. 14 is a structural diagram of an image display system provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the embodiment of the present invention, a logical processing layer independent of the source image layer and the physical display device layer is set between the existing source image layer and the physical display device layer, through which the pixel points in the source image are calculated Map to the coordinate value on the physical display device, and calculate the pixel position of the source image in the video memory of the physical display device according to the coordinate value, and the color depth value and resolution of the physical display device, so that when replacing with a different resolution Or when using physical display devices with different color spaces, you only need to modify the corresponding interface in the logical processing layer, which has good portability and reduces the difficulty of maintenance.

Figure 1 shows the implementation process of the image display method provided by the embodiment of the present invention, which is described in detail as follows:

In step S101, coordinate values mapped from pixels in the source image to physical display devices are calculated.

In step S102, according to the coordinate value and the color depth value and resolution of the physical display device, calculate the position of the pixel in the source image in the video memory of the physical display device, and store the pixel in the source image to the physical display The location in the device's video memory.

In step S103, the pixels stored in the display memory are displayed on the physical display device.

Fig. 2 shows an embodiment of the present invention that calculates the pixel points in the source image and maps them to the coordinate values on the physical display device, and displays the pixels in the source image on the calculated coordinate values corresponding to the physical display device. The implementation process of location is described in detail as follows:

In step S201, the coordinate value of the initial display pixel point of the source image is obtained, and the coordinate value mapped to the physical display device by the initial display pixel point of the source image is calculated;

In step S202, it is judged whether the pixel points in the source image have been mapped, if yes, the pixel point mapping ends, otherwise, step S203 is performed;

In step S203, the coordinate value of the next pixel in the source image is obtained, and the coordinate value of the pixel mapped to the physical display device is calculated;

In step S204, it is determined whether the coordinate value of the pixel point mapped to the physical display device exceeds the display range of the physical display device, if yes, execute step S202, otherwise execute step S205.

In step S205, the pixel points in the source image are displayed at positions corresponding to the coordinate values mapped to the physical display device, and step S204 is continued.

Through the above steps S201 to S205, the coordinates of all the pixels in the source image mapped to the physical display device can be calculated.

Fig. 3 shows the implementation process of obtaining the coordinate value of the initial display pixel point of the source image provided by the embodiment of the present invention, and calculating the coordinate value mapped from the initial display pixel point of the source image to the physical display device, which is described in detail as follows :

In step S301, the coordinate values (X ₀ , Y ₀ ) of the initial display pixel point in the source image are acquired.

When obtaining the coordinate value of the initial display pixel point in the source image, the coordinate value (X ₀ , Y ₀ ) of the initial display pixel point in the source image may be obtained from the source image layer. The coordinate values (X ₀ , Y ₀ ) of the initial display pixel do not exceed the range of the initial source image. That is, assuming that the rectangular coordinates of the initial source image are as shown in Figure 4, the range of the initial source image is from pixel point (X ₀₀ , Y ₀₀ ) to pixel point (X _n , Y _n ), and X ₀₀ ≤ _{X n} , Y ₀₀ ≤Y _n , then the acquired coordinate values (X ₀ , Y ₀ ) of the initial display pixel need to satisfy the following conditions: X ₀₀ ≤X ₀ ≤X _n , Y ₀₀ ≤Y ₀ ≤Y _n .

In step S302, the display area of the source image is set according to the coordinate value of the initial display pixel point in the source image.

In the embodiment of the present invention, when setting the display area of the source image, it will be located at the bottom right of the initial display pixel in the source image (that is, the abscissa of the pixel in the source image is greater than or equal to the abscissa of the initial pixel, and the ordinate of the pixel is greater than or equal to the ordinate of the initial pixel), the area formed by all the pixels is set as the display area of the source image, and its effect is shown in FIG. 5 . That is, assuming that the coordinate value of the pixel point is (X _p , Y _p ), then the area composed of all pixel points (X _p , Y _p ) satisfying X ₀ ≤ X _p ≤ X _n , Y ₀ ≤ Y _p ≤ _{Y n is} is the display area of the source image.

In step S303, determine whether the length (L_p) of the display area of the source image is greater than the length (L_s) of the physical display device, and whether the width (W_p) of the display area of the source image is greater than the width (W_s) of the physical display device.

If L_p≤L_s, and W_p≤W_s, that is, when the length and width of the display area of the source image are both less than or equal to the length and width of the physical display device, execute step S304; if L_p>L_s, and W_p≤W_s, that is, the source image When the length of the display area is greater than the length of the physical display device, and the width of the display area of the source image is less than or equal to the width of the physical display device, execute step S305; if L_p≤L_s, and W_p>W_s, that is, the display area of the source image When the length of is less than or equal to the length of the physical display device, and the width of the display area of the source image is greater than the width of the physical display device, execute step S306; if L_p>L_s, and W_p>W_s, that is, the length of the display area of the source image and When the widths are both greater than the length and width of the physical display device, step S307 is performed.

In step S304, the initial display pixel point (X ₀ , Y ₀ ) in the source image is mapped to the center position (X _s , Y _s ) of the physical display device, so that the source image can be displayed in the center of the physical display device position, where X _s =(L_s-L_p)/2, Y _s =(W_s-W_p)/2. The effect of mapping the initial display pixel point (X ₀ , Y ₀ ) of the source image to the centered position (X _s , Y _s ) of the physical display device is shown in FIG. 6 .

In step S305, the initial display pixel point (X ₀ , Y ₀ ) in the source image is mapped to the vertical center position (X _s , Y _s ) of the physical display device, so that the source image can be aligned in the horizontal direction of the physical display device , and at the same time centered in the vertical direction of the physical display device, where X _s =0, Y _s =(W_s-W_p)/2. The effect of mapping the initial display pixel point (X ₀ , Y ₀ ) in the source image to the left vertical center position (X _s , Y _s ) of the physical display device is shown in FIG. 7 .

In step S306, the initial display pixel point (X ₀ , Y ₀ ) in the source image is mapped to the horizontal center position (X _s , Y _s ) of the physical display device, so that the source image can be aligned in the vertical direction of the physical display device , and displayed at the center in the horizontal direction of the physical display device at the same time, where X _s =(L_s-L_p)/2, Y _s =0. The effect of mapping the initial display pixel point (X ₀ , Y ₀ ) in the source image to the horizontal center position (X _s , Y _s ) of the physical display device is shown in FIG. 8 .

In step S307, the initial display pixel point (X ₀ , Y ₀ ) in the source image is mapped to the origin position (X _s , Y _s ) of the physical display device, so that the initial display pixel point in the source image is consistent with the physical display device The origin of is aligned, where X _s =0, Y _s =0. The effect of mapping the initial display pixel point (X ₀ , Y ₀ ) in the source image to the origin position (X _s , Y _s ) of the physical display device is shown in FIG. 9 .

After the above steps S301 to S307, the coordinate values (X _s , Y _s ) mapped from the initial display pixel point (X ₀ , Y ₀ ) of the source image to the physical display device can be calculated. It can be understood that after the initial display pixel point (X ₀ , Y ₀ ) of the source image is calculated and mapped to the coordinate value (X s , Y s ) of the physical display device, the initial display pixel point (X _s , Y _s ) of the source image is obtained. ₀ , Y ₀ ), and map the pixel point (X ₀ , Y ₁ ) to the next coordinate value _of the coordinate value (X _s , Y _{s )} of the physical display device (X _s , _{Y s+1} ), according to the above method, the coordinate value (X _d , _{Y d} ).

Fig. 10 shows the coordinate values of the pixels in the source image mapped to the physical display device provided by the embodiment of the present invention, as well as the color depth value and resolution of the physical display device, and the calculation of the pixel points in the source image on the physical display The specific steps for the location in the video memory of the device are as follows:

In step S1001, a physical display device is initialized.

In the embodiment of the present invention, when initializing the physical display device, it is necessary to initialize the hardware logic of the physical display device and the storage sequence mode of the pixels in the display memory. After the physical display device is initialized, the color depth value (P2_bpp) supported by the physical display device, the base address of the video memory (pBase) and the storage order mode of the pixels in the video memory are obtained.

The storage order mode of the pixels in the video memory can be LBLP (Little Endian Byte, Little Endian Pixel order) mode, BBBP (Big Endian Byte, Big Endian Pixel order) mode, or LBBP (Little Endian Byte, Big Endian Pixel order) mode.

In step S1002, determine whether the color depth value (P1_bpp) of the source image is consistent with the color depth value (P2_bpp) supported by the physical display device, if not, execute step S1003, otherwise execute step S1004.

In step S1003, the precision conversion is performed on the color value of the pixel in the source image to obtain a new color value of the pixel.

In step S1004, according to the coordinate values (Xd, Yd) that the pixels in the source image are mapped to the physical display device, and the color depth value and resolution of the physical display device, calculate the distance between the pixels in the source image and the physical display device. location in video memory.

In the embodiment of the present invention, if the color depth value supported by the physical display device is less than 8BPP, such as 1BPP, 2BPP or 4BPP, the step of calculating the position of the pixel in the source image in the video memory of the physical display device is specifically:

A. Calculate the byte position of the pixel in the source image in the video memory of the physical display device, in bytes, and the calculation formula is as follows:

pByte=pBase+(Y _d *screen_width+X _d )*P2_bpp/8, where pBase is the base address of the video memory, (X _d , Y _d ) is the coordinate value of the pixel in the source image mapped to the physical display device, screen_width *screen_height is the resolution of the physical display device, where screen_width is the number of pixels occupied by a row on the physical display device, and screen_height is the number of pixels occupied by a column on the physical display device. P2_bpp is the color depth value supported by the physical display device.

B. Calculate the offset poffset of a pixel in a byte;

In the embodiment of the present invention, the offset poffset can be calculated in the following two ways. One way is to directly query the relationship between the pixel point corresponding to one byte and the offset in each mode in the physical display device. Correspondence table; the other is to calculate the offset poffset of a pixel in a byte through the following calculation formula:

poffset=((Yd*screen_width+Xd)&((1<<(3-index))-1))<<index;

Wherein, when the color depth value of the physical display device is 1BPP, then index=0; when the color depth value of the physical display device is 2BPP, then index=1; when the color depth value of the physical display device is 4BPP, then index= 2;

C. Adjust the offset poffset according to the storage sequence mode of the pixels in the video memory of the physical display device.

When the LBLP mode is used, since LBLP is the default pixel storage mode of the physical display device, there is no need to adjust the offset poffset;

When using BBBP mode, use the following adjustment formula to adjust the offset poffset:

poffset＝(((Y _d *screen_width+X _d )&((unsigned int)((unsigned int)1<<(3-index))-1))<<index)^((unsigned int)((unsigned int) int)7<<index)&7);

Wherein, when the color depth value of the physical display device is 1BPP, then index=0; when the color depth value of the physical display device is 2BPP, then index=1; when the color depth value of the physical display device is 4BPP, then index= 2.

When using LBBP mode, use the following adjustment formula to adjust the offset poffset:

poffset＝(((Yd*screen_width+Xd)&((unsigned int)((unsigned int)1<<(3-index))-1))<<index)^((unsigned int)((unsigned int) 7<<index)&7);

Wherein, when the color depth value of the physical display device is 1BPP, then index=0; when the color depth value of the physical display device is 2BPP, then index=1; when the color depth value of the physical display device is 4BPP, then index= 2.

D. Determine the position of the pixel in the source image in the video memory of the physical display device pAdd=pByte+poffset according to the calculated position pByte of the pixel in the source image in the video memory of the physical display device and the calculated offset poffset .

In the embodiment of the present invention, when calculating the position pAdd of the pixel in the source image in the display memory of the physical display device, the calculation formula used is pAdd=pBase+(Y _d *screen_width+X _d )*P2_bpp, where the calculated pAdd is in bits.

In the embodiment of the present invention, since the display of the physical display device stores pixels in bytes, it is necessary to convert the calculated pAdd in units of bits into pAdd in units of bytes (called pAdd in units of bytes). is pByte), where pByte=pBase+(Yd*screen_width+Xd)*P2_bpp/8.

If the color depth value supported by the physical display device is equal to or greater than 8BPP, such as 8BPP, 16BPP or 24BPP, no matter what pixel storage mode the video memory in the physical display device uses, the following calculation formula is used: pAdd=pBase+(Yd* screen_width+Xd)*P2_bpp/8, calculate the position of the pixel in the source image in the video memory of the physical display device. Fig. 11 shows the implementation process of performing precision conversion on the color value of a pixel in the source image to obtain a new color value of the pixel provided by an embodiment of the present invention, and the details are as follows:

In step S1101, each component value of the color value of the pixel in the source image is acquired.

In the embodiment of the present invention, assuming that the color value of the pixel point of the source image is RGB_value, and assuming that the maximum component values of the components corresponding to RGB_value are R_Max_value, G_Max_value and B_Max_value respectively, then according to the color value and color of the pixel point in the source image The component values R_Src_value, G_Src_value and B_Src_value of the pixel color value obtained by the maximum value of the component corresponding to the value are:

R_Src_value＝(RGB_value＞＞(G1_bits+B1_bits))&R_Max_value;

G_Src_value＝(RGB_value＞＞B1_bits)&G_Max_value;

B_Src_value=RGB_value & B_Max_value.

Where G1_bits and B1_bits are respectively the number of bits of the components R and G of the color value (RGB_value) of the pixel of the source image.

In step S1102, precision conversion is performed on the component values R_Src_value, G_Src_value and B_Src_value of the color value of each pixel in the source image using the precision conversion formula.

Please refer to FIG. 12 , which is a schematic diagram of precision conversion for component values of color values of pixels in a source image provided by an embodiment of the present invention. The precision conversion formula adopted in the embodiment of the present invention is P_Src_value/P_Src_max=P_Obj_value/P_Obj_max, wherein P_Src_value and P_Src_max are respectively the component value and the maximum component value of the color value of the pixel point of the source image, and P_Obj_value and P_Obj_max are respectively supported by the physical display device The component value and maximum component value of the color value of the image pixel.

The specific process of precision conversion of the color value components R_Src_value, G_Src_value and B_Src_value of each pixel of the source image is as follows: Assume that the component values of the color value of the image pixel after precision conversion are R_Obj_value, G_Obj_value and B_Obj_value, And assuming that the maximum component value of the color value of the pixel supported by the physical display device is R_Max_Obj_value, G_Max_Obj_value and B_Max_Obj_value, then

R_Obj_value=(R_Src_value/R_Max_value)*R_Max_Obj_value;

G_Obj_value=(G_Src_value/G_Max_value)*G_Max_Obj_value;

B_Obj_value=(B_Src_value/B_Max_value)*B_Max_Obj_value.

In step S1103, the component values of the converted color value of the pixel point are reassembled into a new color value of the pixel point by using a displacement operation. The specific process is as follows:

Assuming that the component values of the color values of the pixels are reassembled and the color value is RGB_New_value, then RGB_New_value=(unsigned short)(((unsigned short)R_Obj_value<<(G_bits+B_bits))

|((unsigned short)G_Obj_value＜＜B_bits)

|(unsigned short)B_Obj_value). (Where G_bits is the number of digits occupied by component G of the color value of the physical display device, B_bits is the number of digits occupied by component B of the color value of the pixel point of the physical display device)

Through the above steps S1101 to S1103, the pixel point in the source image can be converted in precision to obtain the new color value RGB_New_value of the pixel point.

At this time, during the process of storing the pixels in the source image to the calculated position in the display memory, when the color depth value of the source image is consistent with the color depth value supported by the physical display device, the pixel points of the source image The color value is stored in the calculated position of the pixel in the video memory of the physical display device; when the color depth value of the source image is inconsistent with the color depth value supported by the physical display device, the color value of the pixel in the source image is The new color value of the pixel obtained by precision conversion is stored to the calculated position of the pixel in the video memory of the physical display device.

In the embodiment of the present invention, when the color depth value of the pixel in the source image is inconsistent with the color depth value supported by the physical display device, precision conversion is performed on the pixel in the source image so that the pixel in the source image There will be no distortion in the display on the physical display device. Therefore, when replacing the physical display device with different color depth values or resolutions, the pixels are converted to precision and the corresponding interface of the program that implements the above method is modified, namely The source image can be displayed on the replaced physical display device, which has good portability and is convenient for later maintenance.

Fig. 13 shows the architecture of the image display system provided by the embodiment of the present invention. According to the functions of the image display system, the image display system is divided into three layers, namely source image layer, logical abstraction layer and physical display layer. The logic abstraction layer gradually maps the pixels of the source image in the source image layer to the coordinate values on the physical display device, and calculates the source image according to the coordinate values of the physical display device, as well as the color depth value and resolution of the physical display device. The position of each pixel in the video memory of the physical display device, and store each pixel of the source image in the position of the pixel in the video memory of the physical display device, and the physical display layer displays the pixels stored in its video memory on the physical displayed on the device.

FIG. 14 shows the structure of the image display system obtained according to the architecture of the image display system shown in FIG. 13 . For convenience of description, only the parts related to the embodiment of the present invention are shown.

The pixel mapping unit 1 calculates the coordinate values (X _d , Y _d ) where the pixel points in the source image are mapped to the physical display device according to the coordinate values (X _p , Y _p ) of the pixel points in the source image. The image display area setting module 11 determines the display area of the source image according to the initial display pixel set by the user. The pixel coordinate acquisition module 12 acquires the coordinate values (X _p , Y _p ) of each pixel in the display area of the source image. The pixel coordinate mapping module 13 calculates the coordinate values (X _d , Y p ) of each pixel in the display area of the source image mapped to the physical display device according to the coordinate values (X _p , Y _{p )} of each pixel point in the display area of the source image. _d ).

The pixel coordinate acquisition module 12 first obtains the coordinate value (X ₀ , Y ₀ ) of the initial pixel point in the display area of the source image, and the pixel coordinate mapping module 13 judges whether the length (L_p) of the display area of the source image is greater than that of the physical display device length (L_s), and whether the width (W_p) of the display area of the source image is greater than the width (W_s) of the physical display device.

When L_p≤L_s, and W_p≤W_s, the pixel coordinate mapping module 13 maps the starting pixel point in the source image to the center position (X _s , Y _s ) of the physical display device, so that the source image can be displayed on the physical display The central position of the device, where X _s =(L_s-L_p)/2, Y _s =(W_s-W_p)/2;

When L_p>L_s, and W_p≤W_s, the pixel coordinate mapping module 13 maps the starting pixel point in the source image to the vertically centered starting point (X _s , Y _s ) of the physical display device, so that the source image can be displayed on the physical display device Aligned horizontally, where X _s =0, Y _s =(W_s-W_p)/2;

When L_p≤L_s, and W_p>W_s, the pixel coordinate mapping module 13 maps the starting pixel point in the source image to the horizontally centered starting point (X _s , Y _s ) of the physical display device, so that the source image can be displayed on the physical display device Align in the vertical direction, where X _s =(L_s-L_p)/2, Y _s =0;

When L_p>L_s, and W_p>W_s, the pixel coordinate mapping module 13 maps the initial pixel point in the source image to the origin (X _s , Y _s ) of the physical display device, so that the initial display pixel point of the source image is consistent with the physical The origin of the display device is aligned, where X _s =0, Y _s =0.

After calculating the coordinate value of the initial display pixel point of the display area of the source image mapped to the physical display device, the pixel coordinate acquisition module 12 acquires the coordinate value of the next pixel point of the initial pixel point in the display area of the source image (X ₀ , Y ₁ ), the pixel coordinate mapping module 13 maps _the pixel point (X ₀ , Y ₁ ) to the coordinate value ( _{X s} , Y _{s+ 1} ), and so on, any pixel point (X _p , Y _p ) in the display area of the source image can be mapped to the coordinate value (X _d , Y _d ) of the physical display device.

The memory position calculation unit 2 calculates the coordinate value of each pixel in the source image obtained by the pixel mapping unit 1 and maps to the physical display device, as well as the resolution and color depth value of the physical display device, and calculates the position of each pixel in the source image on the physical display device. location in video memory. Wherein the initialization module 21 initializes the hardware logic of the physical display device and the storage order mode of the pixels in the video memory to obtain the bit width pixel_width_bytes of a single pixel, the base address pBase of the video memory, the BPP mode and the storage order mode of the pixels in the video memory . The storage order mode of the pixels in the video memory can be LBLP mode (Little Endian Byte, Little Endian Pixel order), BBBP mode (Big Endian Byte, Big EndianPixel order), or LBBP mode (Little Endian Byte, Big Endian Pixel order).

The color depth value judging module 22 judges whether the color depth value of the source image is consistent with the color depth value supported by the physical display device, if not, the precision conversion module 23 performs precision conversion to the pixel in the source image to obtain the pixel's The new color value. The color value acquisition module 231 acquires the component values R_Src_value, G_Src_value and B_Src_value of the color value of each pixel in the source image. The specific process is as described above and will not be repeated here. The component value precision conversion module 232 uses a precision conversion formula to perform precision conversion on the component values R_Src_value, G_Src_value and B_Src_value of the color value of each pixel in the source image. In the embodiment of the present invention, the precision conversion formula adopted is P_Src_value/P_Src_max=P_Obj_value/P_Obj_max, wherein P_Src_value and P_Src_max are respectively the component value and the maximum component value of the color value of the source image pixel, and P_Obj_value and P_Obj_max are respectively the physical display device The component values and maximum component values of the color values of the supported pixels. The specific process of component value precision conversion is as described above, and will not be repeated here. The component value splicing module 233 resplices the converted component values of the pixel's color value into a new color value of the pixel by using a displacement operation. The specific process is as described above and will not be repeated here.

The display memory position calculation module 24 calculates the pixel points according to the coordinate values (Xd, Yd) mapped to the physical display device by each pixel in the source image display area obtained by the pixel mapping unit 1, and the resolution and color depth value of the physical display device The specific process of the storage location in the video memory of the physical display device is as described above, and will not be repeated here.

The pixel point storage module 25 stores the color value of the source image obtained by the precision conversion module 23 or the original color value of the source image into the corresponding position in the video memory of the physical display device calculated by the video memory position calculation module 24 .

The image display unit 3 displays the pixels stored in the video memory of the physical display device on the physical display device.

In the embodiment of the present invention, a logical processing layer independent of the source image layer and the physical display device layer is set between the existing source image layer and the physical display device layer, and the pixels in the source image are processed by the logical processing layer The points are gradually mapped to the coordinates on the physical display device, and the position of the source image in the video memory of the physical display device is calculated according to the coordinates of the physical display device, the color depth value of the pixel point, and the resolution of the physical display device, so that when changing the source When changing the resolution and chromaticity space of the image or changing the physical display device, you only need to modify the corresponding interface of the corresponding program in the logic processing layer to display the source image on the physical display device, which has good portability and increases program development. The flexibility of the software also reduces the cycle of secondary development of the software and simplifies the maintenance of the software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (16)

1. An image display method, characterized in that the method comprises the following steps: According to the coordinate value of the pixel point in the source image, obtain the coordinate value of the pixel point in the source image mapped to the physical display device; According to the coordinate value of the pixel in the source image mapped to the physical display device, and the color depth value and resolution of the physical display device, obtain the position of the pixel in the source image in the video memory of the physical display device, and The pixels in the source image are stored to the positions of the pixels in the video memory of the physical display device; Display the pixels stored in the video memory of the physical display device on the physical display device. 2. The method according to claim 1, wherein the step obtains the coordinate values of the pixels in the source image mapped to the physical display device according to the coordinate values of the pixels in the source image as follows: Obtain the coordinate value of the initial display pixel point of the source image, and calculate the coordinate value of the initial display pixel point mapped to the physical display device; Obtain the coordinate value of the next pixel in the source image, calculate the coordinate value of the pixel mapped to the physical display device, and execute in a loop until all the pixels in the source image are mapped. 3. The method according to claim 2, wherein the step of obtaining the coordinate value of the initial display pixel point of the source image and calculating the coordinate value of the initial display pixel point mapped to the physical display device is specific for: Obtain the coordinate value (X ₀ , Y ₀ ) of the initial display pixel point in the source image; Set the display area of the source image according to the coordinate value (X ₀ , Y ₀ ) of the initial display pixel point; According to the display area of the source image, the coordinate values (X ₀ , Y ₀ ) of the initial display pixel in the source image are mapped to the coordinate values on the physical display device. 4. The method according to claim 3, wherein the step calculates the coordinate value (X ₀ , Y ₀ ) of the initial display pixel point in the source image according to the display area of the source image and maps it to the physical The coordinate values on the display device are specifically: Determine whether the length L_s of the display area of the source image is greater than the length L_p of the physical display device, and whether the width W_s of the display area of the source image is greater than the width (W_p) of the physical display device; When L_p≤L_s, and W_p≤W_s, map the initial display pixel point (X ₀ , Y ₀ ) of the source image to the centered position (X _s , Y _s ) of the physical display device, where X _s =(L_s-L_p)/2, Y _s =(W_s-W_p)/2; When L_p>L_s, and W_p≤W_s, map the initial display pixel point (X ₀ , Y ₀ ) of the source image to the vertical center position (X _s , Y _s ) of the physical display device, where X _s = 0, Y _s = (W_s-W_p)/2; When L_p≤L_s, and W_p>W_s, map the initial display pixel point (X ₀ , Y ₀ ) of the source image to the horizontal center position (X _s , Y _s ) of the physical display device, where X _s = (L_s-L_p)/2, Y _s =0; When L_p>L_s, and W_p>W_s, map the starting display pixel point (X ₀ , Y ₀ ) of the source image to the origin (X _s , Y _s ) of the physical display device, where X _s =0, Y _s =0. 5. The method according to claim 1, characterized in that, in the step, according to the coordinate values mapped from the pixels in the source image to the physical display device, and the color depth value and resolution of the physical display device, obtain The position of the pixel in the source image in the video memory of the physical display device, and storing the pixel in the source image to the position of the pixel in the video memory of the physical display device is specifically: Initialize the physical display device; Judging whether the color depth value of the source image is consistent with the color depth value supported by the physical display device, if inconsistent, performing precision conversion on the color value of the pixel in the source image to obtain a new color value of the pixel; Calculate the position of the pixel in the video memory of the physical display device according to the coordinate value of the pixel in the source image mapped to the physical display device, and the resolution and color depth value of the physical display device; The color value of the pixel point of the source image is stored in the position of the pixel point in the video memory of the physical display device. 6. The method according to claim 5, wherein the step of performing precision conversion on the color values of pixels in the source image to obtain new color values of the pixels is specifically as follows: Get each component value of the color value of the pixel in the source image; performing precision conversion on the component values respectively; The component values after the precision conversion are reassembled into a new color value of the pixel. 7. The method according to claim 6, characterized in that, when performing precision conversion on said component values respectively, the precision conversion formula adopted is: P_Src_value/P_Src_max=P_Obj_value/P_Obj_max, Among them, P_Src_value and P_Src_max are the component value and maximum component value of the color value of the pixel in the source image, respectively, and P_Obj_value and P_Obj_max are the component value and maximum component value of the color value of the pixel supported by the physical display device, respectively. 8. The method according to claim 5, wherein when the color depth value of the physical display device is equal to or greater than 8BPP, the calculation method of the video memory location is: pAdd=pBase+(Y _d *screen_width+X _d )*P2_bpp/8, Among them, pBase is the base address address of the video memory, (X _d , Y _d ) is the coordinate value of the pixel in the source image mapped to the physical display device, screen_width is the number of pixels occupied by a line on the physical display device, and P2_bpp is the physical Displays the color depth values supported by the device. 9. The method according to claim 5, wherein the storage order mode of the pixels in the video memory is LBLP mode, BBBP mode, or LBBP mode. 10. The method according to claim 8, wherein when the color depth value of the physical display device is less than 8BPP, the pixel points in the source image are mapped to the coordinate values of the physical display device and the physical display device The steps for calculating the position of the pixel in the video memory of the physical display device based on the resolution and color depth value are as follows: Calculate the byte position pByte of the pixel in the source image in the video memory of the physical display device; Calculate the offset poffset of a pixel in a byte; Adjusting the offset poffset according to the storage order mode of the pixels in the video memory; The position pAdd=pByte+poffset of the pixel in the source image in the display memory of the physical display device is determined according to the byte position pByte and the adjusted offset poffset. 11. The method according to claim 9, wherein the method of calculating the offset poffset of a pixel in a byte is by directly querying the physical display device corresponding to a byte in each mode The correspondence table between the pixel and the offset poffset, or calculate the offset poffset of a pixel in a byte for use. 12. The method according to claim 9, wherein the step of adjusting the offset poffset according to the storage sequence mode of the pixels in the video memory is specifically as follows: When the storage order mode of the pixels in the video memory is LBLP mode, the offset poffset is not adjusted; When the storage order mode of pixels in video memory is BBBP mode or LBBP mode, use the formula poffset=(((Y _d *screen_width+X _d )&((unsigned int)((unsigned int)1<<(3-index ))-1))<<index)^((unsigned int)((unsigned int)7<<index)&7) adjusts the offset poffset; Wherein, when the color depth value of the physical display device is 1BPP, index=0; when the color depth value of the physical display device is 2BPP, index=1; when the color depth value of the physical display device is 4BPP, index=2. 13. An image display system, characterized in that the system comprises: A pixel mapping unit, configured to calculate the coordinate values of each pixel in the source image mapped to the physical display device according to the coordinate values of each pixel in the source image; A video memory position calculation unit, used to calculate the position of each pixel in the source image in the video memory of the physical display device according to the coordinate value calculated by the pixel mapping unit, and the resolution and color depth value of the physical display device, and The color value of each pixel in the source image is stored to the calculated position in the corresponding video memory; The image display unit is configured to display the pixels stored in the video memory of the physical display device on the physical display device. 14. The system of claim 13, wherein the pixel mapping unit comprises: The image display area setting module is used to determine the display area of the source image according to the initial display pixel set by the user; A pixel coordinate acquisition module, configured to acquire the coordinate values of each pixel in the display area of the source image; The pixel coordinate mapping module is used to calculate the coordinate value of each pixel in the display area of the source image mapped to the physical display device according to the coordinate value of each pixel in the display area of the source image. 15. The system according to claim 13, wherein the memory location calculation unit comprises: The initialization module is used to initialize the physical display device; The color depth value judging module is used to judge whether the color depth value of the source image is consistent with the color depth value supported by the physical display device; A precision conversion module, configured to perform precision conversion on the color value of a pixel in the source image to obtain a new color value of the pixel when the judgment result of the color depth value judging module is negative; A video memory position calculation module, configured to calculate the position of the pixel in the video memory of the physical display device according to the coordinate value of the pixel in the source image mapped to the physical display device, and the resolution and color depth value of the physical display device; The pixel point storage module is used to store the pixel point of the source image to the position of the pixel point in the video memory of the physical display device. 16. The system according to claim 15, wherein the precision conversion module comprises: A color value acquisition module, configured to acquire each component value of the color value of a pixel in the source image; A component value precision conversion module, configured to perform precision conversion on the component values respectively; The component value splicing module is configured to resplice the component values after precision conversion into a new color value of the pixel.

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