KR100658359B1 - Image processing apparatus and image processing method of plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel, and more particularly, to an image processing apparatus and an image processing method of a plasma display panel capable of removing noise generated when an image of the plasma display panel is implemented.

According to the present invention, an image processing apparatus of a plasma display panel includes at least two subfield mapping tables having different numbers of real gray levels mapped to each other, and the subfield mapping table corresponds to motion information of an input image signal. It is characterized in that it is used selectively.

Description

Image Processing Device and Method for Plasma Display Panel

1 illustrates a structure of a general plasma display panel.

2 is a diagram illustrating a method of implementing an image of a conventional plasma display panel.

3 is a graph comparing luminance characteristics of a plasma display panel and a cathode ray tube.

4 is a graph illustrating inverse gamma correction in a conventional plasma display panel.

5A and 5B illustrate dithering methods of a conventional plasma display panel.

6 is a diagram illustrating an error diffusion method of a conventional plasma display panel.

7 is a block diagram illustrating an image processing apparatus of a plasma display panel according to an exemplary embodiment of the present invention.

8 is a block diagram schematically illustrating a motion information generator according to an embodiment of the present invention.

9 is a view for explaining the operation characteristics of the luminance corrector according to an embodiment of the present invention.

10 is a flowchart for explaining an image processing method of a plasma display panel according to an embodiment of the present invention.

***** Explanation of symbols for main parts of drawing *****

710; Inverse gamma correction units 720 and 800; Motion information generator

730; A luminance corrector 740; Half Toning Section

750; Subfield mapping unit 760; Data sorter

770; A data driver 780; APL Department

810; Motion amount measuring unit 820; Motion level determination unit

830; Subfield Mapping Table Selection

The present invention relates to a plasma display panel, and more particularly, to an image processing apparatus and an image processing method of a plasma display panel capable of removing noise generated when an image of the plasma display panel is implemented.

In general, a plasma display panel (Plasma Display Panel) is a partition wall formed between the front substrate and the rear substrate forms a unit cell, each of the Neon (He), helium (He) or neon and helium mixed gas A main discharge gas such as (Ne + He) and an inert gas containing a small amount of xenon are filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration.

1 illustrates a structure of a general plasma display panel.

As shown in FIG. 1, a plasma display panel includes a front substrate in which a plurality of sustain electrode pairs formed by pairing a scan electrode 102 and a sustain electrode 103 are formed on a front glass 101, which is a display surface on which an image is displayed. The rear substrate 110 having the plurality of address electrodes 113 arranged to intersect the plurality of sustain electrode pairs on the back glass 111 forming the back surface 100 and the rear surface is coupled in parallel with a predetermined distance therebetween. .

The front substrate 100 may include a scan electrode 102 and a sustain electrode 103, that is, a transparent electrode a made of a transparent indium thin oxide (ITO) material for mutual discharge in one discharge cell and maintaining light emission of the cell. It is covered by one or more dielectric layers 104 which limit the discharge current of the scan electrode and the sustain electrode 103 provided with the bus electrode b made of a metal material and insulate the electrode pairs. A protective layer 105 in which magnesium oxide (MgO) is deposited is formed on the entire surface of the dielectric layer 104 to facilitate discharge conditions.

The rear substrate 110 is arranged in such a manner that a plurality of discharge spaces, that is, barrier ribs 112 of a stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 113 which perform address discharge to generate vacuum ultraviolet rays are arranged in parallel with the partition wall 112. On the upper side of the rear substrate 110, R, G, and B phosphors 114 which emit visible light for image display during address discharge are coated. A dielectric layer 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113.

2 is a diagram illustrating a method of implementing an image of a conventional plasma display panel.

As shown in FIG. 2, the plasma display panel divides one frame period into a plurality of subfields having different discharge times, and emits the plasma display panel in a subfield period corresponding to a gray value of an input image signal. An image is implemented.

Each subfield is divided into a reset period for uniformly generating a discharge, an address period for selecting a discharge cell, and a sustain period for implementing gray scale according to the number of discharges. For example, when the image is to be displayed with 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields.

In addition, each of the eight subfields is divided into a reset period, an address period, and a sustain period. Here, the sustain period is increased at the ratio of 2 ⁿ (n = 0,1,2,3,4,5,6,7) in each subfield. As described above, since the sustain period is changed in each subfield, gray levels of an image can be realized.

3 is a graph comparing luminance characteristics of a plasma display panel and a cathode ray tube.

As shown in FIG. 3, a cathode-ray tube and a liquid crystal display display a desired gray scale by controlling the displayed light in an analog manner with respect to an input video signal. It has a luminance characteristic of. In contrast, the plasma display panel modulates the number of light pulses using a matrix array of discharge cells that can be turned on and off, thereby expressing gray scale, and thus has a linear luminance characteristic.

The gray scale expression method of the plasma display panel is called a PWM (pulse width modulation) method. The luminance of the plasma display panel changes linearly with the number of pulses, but since the degree of perception of our vision is nonlinear, noise is generated when the gray scale is expressed in the low gray scale region. Therefore, in order to solve the problem, the plasma display panel inversely gamma corrects the input image signal data as shown in FIG. 4.

4 is a graph illustrating inverse gamma correction in a conventional plasma display panel. In Fig. 4, the target luminance is an ideal inverse gamma result to be corrected, and the actual luminance is a measured luminance value as a result after inverse gamma correction, and the plasma display panel luminance is a luminance value measured in the absence of inverse gamma correction. 3 or less is shown.

As shown in FIG. 4, the target luminance is expressed as luminance values having different gray levels of 61 to 0 to 60, respectively. In contrast, the actual luminance is expressed by only eight luminance values of 61 gray levels from 0 to 60. Therefore, when the inverse gamma correction is performed in the plasma display panel, sufficient gray scale expression cannot be expressed in a dark area, resulting in a contour noise in which images are aggregated.

In order to express the insufficient gray level of the plasma display panel, a half tone method such as a dithering method and an error diffusion method is used.

First, the dithering method will be described with reference to FIGS. 5A and 5B.

5A and 5B illustrate dithering methods of a conventional plasma display panel. 5A is a conventional 2x2 dither mask, and FIG. 5B is a dither mask pattern by a 2x2 dither mask.

As illustrated in FIGS. 5A and 5B, the dithering method is a method of determining whether a carry occurs by comparing a gray value of each pixel with a specific threshold value of the dither mask. In this case, it is intended to increase the insufficient gradation expression power by turning on the off-pixel and turning off the off-pixel.

In addition, the dithering method is a method that adds appropriate noise so that the pseudo contour is not visible. In the related art, a three-dimensional dither mask pattern corresponding to a plurality of frames, a plurality of lines, and a plurality of columns of a plasma display panel is repeatedly used.

However, the dithering method has a problem in that dithering noise for reducing the image quality at a specific gray level is generated. In addition, there is a problem that an error indicating how large or less than a threshold value is not considered at all when generating a digitization.

An error diffusion method, which is another method, is described with reference to FIG. 6.

6 is a diagram illustrating an error diffusion method of a conventional plasma display panel.

As shown in FIG. 6, the error diffusion method is a method for spatially correcting an error that is discarded by causing an error generated when the corresponding pixel is quantized to affect neighboring pixels. Here, the error diffusion method multiplies each error value generated in neighboring pixels a, b, c, and d by a specific coefficient. Thereafter, error values obtained by multiplying the coefficients are added to an i value, and then quantized. Thereafter, the error value generated by the quantization is stored in the line memory again and repeated for every pixel.

However, in the error diffusion method, the error diffusion coefficient is set constant for neighboring pixels. In low gradation, an error diffusion pattern is generated due to a constant error diffusion coefficient repeated every line and every frame.

Halftoning noise, such as dithering noise and error diffusion fringes, increases with less real gray to display on the screen. This is because the actual gradation decreases, thereby increasing the gradation for displaying through half-toning. Here, the real gradation refers to a gradation represented by a combination of subfields having different gradation weights, and not a gradation displayed through image processing such as half-toning, and refers to a gradation as a reference for image processing.

The number of real gray scales to be displayed on the screen has a correlation with pseudo contour noise and half toning noise.

In other words, when a large amount of real gray scale is used, half-toning noise is reduced, while pseudo contour noise is increased, and a current of a data driving circuit applying an address pulse Va for displaying the real gray scale is increased. .

Using less real gray scale reduces pseudo contour noise and current of the data driving circuit, while increasing half-toning noise.

The present invention is to solve the above problems, and to improve the image processing apparatus and image processing method of the plasma display panel, an image processing apparatus and an image processing method of the plasma display panel that can reduce the noise generated when the image is implemented. The purpose is to provide.

In addition, another object of the present invention is to provide an image processing apparatus and an image processing method of a plasma display panel which can improve gray scale linearity and gray scale expression power when implementing an image by improving an image processing apparatus and an image processing method of a plasma display panel. .

In order to achieve the above object, the display device of the plasma display panel of the present invention includes at least two or more subfield mapping tables having different numbers of real gray levels mapped, and the subfield mapping table includes an input video signal. Characterized in that it is selectively used according to the motion (motion) information of.

An image processing apparatus of a plasma display panel of the present invention includes: a motion information generation unit for selecting a subfield mapping table to be used according to a motion amount of a video signal; A luminance corrector for correcting luminance corresponding to an average picture level (APL) of an image signal according to the actual number of gray levels of the selected subfield mapping table; A half toning unit half-toning the image signal input from the luminance corrector by at least one of error diffusion and dithering; And a subfield mapping unit for mapping the image signal input from the half toning unit to the selected subfield mapping table.

The motion information generation unit of the present invention detects the motion amount of the video signal and calculates a motion amount; A motion level determiner configured to determine a motion level according to a motion amount of an image signal input from the motion amount measurer; And a subfield mapping table selector configured to select any one of the at least two subfield mapping tables according to the motion level input from the motion level determiner.

The present invention is characterized in that the amount of motion is measured by comparing the grayscale values of the previous frame (N-1) and the current frame (N) of the video signal.

The apparatus may further include a frame memory unit which stores the image signal of the present invention in units of frames.

The present invention is characterized in that the larger the amount of motion of the video signal, the more subfield mapping table to which the actual gray level is mapped.

The present invention is characterized in that a subfield mapping table having a smaller number of real gray levels is used as the amount of motion of a video signal increases.

The image processing method of the plasma display panel of the present invention includes at least two subfield mapping tables having different numbers of real gray levels mapped, wherein the subfield mapping table is selectively selected according to motion information of an input image signal. It is characterized by being used as.

An image processing method of a plasma display panel of the present invention includes: a motion information generation step of selecting a subfield mapping table to be used according to the motion amount of a video signal; A luminance correction step of correcting luminance corresponding to an average picture level (APL) of an image signal according to the actual number of gray levels of the selected subfield mapping table; A half-toning step of half-toning the image signal input from the luminance correction step by at least one method of error diffusion or dithering; And a subfield mapping step of mapping an image signal input from the halftoning step to the selected subfield mapping table.

According to an aspect of the present invention, in implementing an image device of a plasma display panel, the subfield mapping table may include a plurality of subfield mapping tables having different numbers of real gray levels to be mapped, and determine a motion amount of an image signal. Use it selectively. As a result, the number of actual gray scales is adjusted, and noise generated in the conventional image realization can be reduced.

Hereinafter, with reference to the accompanying drawings, a specific embodiment according to the present invention will be described.

7 is a block diagram illustrating an image processing apparatus of a plasma display panel according to an exemplary embodiment of the present invention.

As illustrated in FIG. 7, an image processing apparatus of a plasma display panel according to an embodiment of the present invention includes at least two or more subfield mapping tables having different numbers of real gray levels mapped thereto, and inputs a subfield mapping table. Selectively used according to the motion information of the video signal to be used.

In order to implement such an image processing apparatus of the plasma display panel of the present invention, the image processing apparatus of the plasma display panel according to an embodiment of the present invention includes an inverse gamma correction unit 710, a motion information generation unit 720, luminance The correction unit 730, the half toning unit 740, the subfield mapping unit 750, the data alignment unit 760, the data driver 770, and the APL unit 780 are included.

When the image signal input from the outside is displayed on the plasma display panel, the inverse gamma correction unit 710 inversely gamma corrects the image signal such that the luminance value displayed with respect to the gray value has a linear value.

The motion information generation unit 720 selects at least one of the at least two subfield mapping tables according to the motion amount of the inverse gamma corrected image signal from the inverse gamma correction unit 710. In addition, the motion information generator 720 provides information on the subfield mapping table selected according to the motion amount to the functional unit. To this end, the motion information generation unit 720 includes a motion amount measurement unit, a motion level determiner, and a subfield mapping table selector (not shown). A more detailed description thereof will be described later with reference to FIG. 7.

The luminance corrector 730 corrects the luminance corresponding to the average picture level (APL) of the image signal according to the number of real grays of the selected subfield mapping table. The APL of the image signal is input from the APL unit 760, and the luminance difference, luminance inversion, or luminance non-displacement state that may occur when the image signal corrected by the reverse gamma correction unit 710 is displayed on the plasma display panel. Correct. In this case, a normalization value varies according to the number of real gray levels of the subfield mapping table selected by the motion information generator 720. Thereby, the image quality of the displayed image can be improved.

Here, the real gradation refers to a gradation represented by a combination of subfields having different gradation weights, and not a gradation displayed through image processing such as half-toning, and refers to a gradation serving as a reference for image processing.

The half toning unit 740 half-tons the image signal input from the luminance corrector 730 by at least one of error diffusion and dithering. The image signal input to the half toning unit 740 includes grayscale data consisting of integer and decimal data. At this time, the decimal data is halftoned to be reflected in the integer data, and whether the integer data is mapped to the selected subfield mapping table is determined. As a result, the total gray value of the input video signal is determined, and the gray linearity and the gray scale expressing power of the displayed image can be secured.

The subfield mapping unit 750 maps the video signal input from the half toning unit 740 to the subfield mapping table selected by the motion information generation unit 720. In this case, the subfield mapping unit 750 is provided with at least two subfield mapping tables having different numbers of actual gray levels.

The data arranging unit 760 sorts the spatially aligned subfield mapping data input from the subfield mapping unit 750 into temporal data.

The data driver 770 receives the data aligned in time by the data aligning unit 760 and supplies an address driving pulse to an address electrode (not shown) of the plasma display panel, thereby realizing an image of the plasma display panel.

The APL unit 780 calculates an average image brightness of an externally input image signal and provides APL information to the inverse gamma correction unit 710 and the brightness correction unit 730 that require the average image brightness information.

As described above, according to an exemplary embodiment of the present invention, noise generated when an image is implemented may be reduced by selectively using a subfield mapping table having different numbers of real gray levels mapped according to the amount of motion of the video signal.

Looking at the configuration and operation characteristics of the motion information generation unit according to an embodiment of the present invention in more detail as shown in FIG.

8 is a block diagram schematically illustrating a motion information generator according to an embodiment of the present invention.

As shown in FIG. 8, the motion information generator 800 according to an embodiment of the present invention may include a motion measurer 810, a motion level determiner 820, and a subfield mapping table selector 830. Equipped.

The motion amount measuring unit 810 detects the motion amount of the inverse gamma corrected image signal input from the inverse gamma correction unit 710, and calculates a motion amount. In this case, the motion amount measuring unit 810 measures the motion amount of the current frame N by comparing the gray level value of the previous frame N-1 and the current frame N of the image signal.

The motion amount measuring unit 810 has the following operating characteristics.

First, the difference between the gray value of the video signal of the previous frame and the video signal of the current frame is obtained. In this case, the video signal of the previous frame and the video signal of the current frame may be compared in any one unit of a pixel unit, a block unit, or a line unit.

Subsequently, the sum of the difference values of the gray levels is added to determine the total motion amount of the current frame with respect to the previous frame. Here, the motion amount is a scalar amount, not a vector amount.

The plasma display panel according to an embodiment of the present invention further includes a frame memory unit (not shown) which stores the image signal in units of frames in order to measure the motion amount by comparing the image signal of the previous frame and the current frame.

The motion level determiner 820 determines the motion level according to the motion amount of the video signal input from the motion amount measurer 810. In this case, the motion level determiner 820 sets at least two thresholds, compares the total motion amount for one frame, and then determines the motion level of the image signal.

The subfield mapping table selector 830 selects any one of at least two subfield mapping tables having different numbers of real gray levels according to the motion level input from the motion level determiner 820.

In an embodiment of the present invention, the higher the motion level of the video signal, that is, the greater the amount of motion, the greater the number of subfield mapping tables to which the actual gray levels are mapped.

Accordingly, the pseudo contour noise can be reduced and the current of the data driving circuit applying the address pulse Va can be reduced by using a subfield mapping table having a small number of real grays mapped to the still image. In addition, in the video, by using a subfield mapping table having a large number of real gray levels mapped in consideration of the amount of motion, the number of real grays mapped as the amount of motion increases may reduce halftoning noise.

In a modified embodiment of the present invention, as the amount of motion of the video signal increases, a subfield mapping table having a smaller number of real gray levels is selected.

Accordingly, in the still image, half-toning noise can be reduced by using a subfield mapping table having a large number of real grays mapped. Also, in the video, pseudo contour noise can be reduced by reducing the number of real grays mapped as the amount of motion increases by using a subfield mapping table having a small number of real grays mapped in consideration of the amount of motion. The current of the data driving circuit applying the pulse Va can be reduced.

As described above, the half toning noise and the pseudo contour noise appear to be mutually conflicting according to the number of real gray scales. In other words, it is possible to reduce noise generated during image realization.

Also, unlike the related art, by providing at least two or more subfield mapping tables having different numbers of real gray scales, the gray scale expressive power may be improved when the image is implemented by selectively using the at least two subfield mapping tables.

9 is a view for explaining the operation characteristics of the luminance corrector according to an embodiment of the present invention.

As shown in FIG. 9, the image processing apparatus of the plasma display panel according to the exemplary embodiment of the present invention selects and uses different inverse gamma curves in units of frames according to the APL input from the APL unit. For this reason, as the APL changes, the luminance correcting unit corrects the luminance step, luminance inversion or luminance no displacement state displayed on the screen with respect to the gray value of the image signal. The luminance correction consists of three stages: a normalization stage, a luminance correction stage, and a gamma recreation stage.

In this case, the subfield mapping table selected by the motion information generator has a close relationship with the normalization step of the luminance corrector. For example, as the subfield mapping table having 10 real gradations is selected, the luminance component is normalized from the lowest value 0 to the maximum value 10 and the luminance value is corrected. That is, the minimum value and the maximum value of the luminance correction value are determined by the subfield mapping table selected according to the motion amount.

10 is a flowchart for explaining an image processing method of a plasma display panel according to an embodiment of the present invention.

As shown in FIG. 10, an image processing method of a plasma display panel according to an embodiment of the present invention includes at least two or more subfield mapping tables having different numbers of real gray levels mapped thereto, and the subfield mapping table is inputted. Selectively used according to the motion information of the video signal to be used.

To this end, in an embodiment of the present invention, an image signal is obtained by processing an image signal input from the outside according to the following steps.

First, in the inverse gamma correction step, when an externally input image signal is displayed on the plasma display panel, the inverse gamma correction is performed such that the luminance value displayed with respect to the grayscale value has a linear value (S100).

Thereafter, the motion information generation step selects at least one of the at least two subfield mapping tables according to the motion amount of the inverse gamma corrected video signal from the inverse gamma correction step (S110).

The motion information generating step according to an embodiment of the present invention detects the motion amount of the video signal, and determines the motion level according to the motion amount of the video signal input from the motion amount measuring step of calculating the motion amount and the motion amount measuring step. And a subfield mapping table selecting step of selecting any one of the at least two subfield mapping tables according to the motion level input from the motion level determining step and the motion level determining step.

Subsequently, in the luminance correction step, the luminance corresponding to the APL of the image signal is corrected according to the actual number of gray levels of the selected subfield mapping table (S120).

Thereafter, the image signal input from the half toning step luminance correction step is half toned by at least one method of error diffusion or dithering (S130).

Subsequently, the subfield mapping step maps an image signal input from the half-toning step to the subfield mapping table selected in the motion information generation step (S140).

Thereafter, the data sorting step sorts the spatially sorted subfield mapping data input from the subfield mapping step into temporal data (S150).

Subsequently, the data driving step receives the time-aligned data by the data alignment step and supplies an address driving pulse to an address electrode (not shown) of the plasma display panel (S160), thereby implementing an image of the plasma display panel.

An image processing method of a plasma display panel according to an embodiment of the present invention further includes a frame memory step (not shown) for storing an image signal in units of frames in order to measure an amount of motion by comparing an image signal of a previous frame and a current frame. Include.

In this case, the larger the amount of motion of the video signal, the more subfield mapping table to which the actual gray level is mapped. In addition, as the amount of motion of the video signal increases, a subfield mapping table having a smaller number of actual gray levels may be used.

For more detailed description of each step of the image processing method of the plasma display panel according to an embodiment of the present invention, the operation characteristics of each part of the image processing apparatus of the plasma display panel according to an embodiment of the present invention in FIGS. Since the description has been sufficiently described above, it will be omitted.

As described above, according to an exemplary embodiment of the present invention, halftoning noise and pseudo contour noise, that is, noise generated when an image is implemented, may be reduced by appropriately adjusting it according to the amount of motion of an image signal.

Also, unlike the related art, by providing at least two or more subfield mapping tables having different numbers of real gray scales, the gray scale expressive power may be improved when the image is implemented by selectively using the at least two subfield mapping tables.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, the present invention improves the image processing apparatus and the image processing method of the plasma display panel, thereby reducing the noise generated during image realization.

In addition, the present invention improves the image processing apparatus and the image processing method of the plasma display panel, there is an effect that can eliminate the luminance step, luminance inversion and the luminance non-displacement state generated in the image implementation.

In addition, the present invention may be capable of improving gray scale linearity and gray scale expression power in image implementation.

Claims (14)

At least two subfield mapping tables having different numbers of real grays mapped to each other, In the subfield mapping table, a subfield mapping table having a large number of real grays is mapped in a video according to motion information of an input video signal, and a subfield mapping table having a small number of real grays in a still image. An image processing apparatus for a plasma display panel, which is used. The method of claim 1, A motion information generation unit for selecting a subfield mapping table used according to the motion amount of the video signal; A luminance corrector for correcting luminance corresponding to an average picture level (APL) of an image signal according to the actual number of gray levels of the selected subfield mapping table; A half toning unit half-toning the image signal input from the luminance corrector by at least one of error diffusion and dithering; And A subfield mapping unit for mapping the video signal input from the half toning unit to the selected subfield mapping table; An image processing apparatus of a plasma display panel comprising a. The method of claim 2, The motion information generator A motion amount measuring unit for detecting a motion amount of the video signal and calculating a motion amount; A motion level determiner configured to determine a motion level according to a motion amount of an image signal input from the motion amount measurer; And A subfield mapping table selecting unit selecting one of the at least two subfield mapping tables according to the motion level input from the motion level determining unit; An image processing apparatus of a plasma display panel comprising a. The method according to any one of claims 1 to 3, And a motion amount is measured by comparing the gray level value of the previous frame (N-1) and the current frame (N) of the image signal. The method of claim 4, wherein And a frame memory unit which stores the image signal in frame units. The method according to any one of claims 1 to 3, And as the amount of motion of the video signal increases, a subfield mapping table having a larger number of real gray levels is used. The method according to any one of claims 1 to 3, And a subfield mapping table having a smaller number of real gray levels is used as the motion amount of the video signal is smaller. At least two subfield mapping tables having different numbers of real grays mapped to each other, In the subfield mapping table, a subfield mapping table having a large number of real grays is mapped in a video according to motion information of an input video signal, and a subfield mapping table having a small number of real grays in a still image. An image processing method for a plasma display panel, which is used. The method of claim 8, A motion information generation step of selecting a subfield mapping table to be used according to the motion amount of the video signal; A luminance correction step of correcting luminance corresponding to an average picture level (APL) of an image signal according to the actual number of gray levels of the selected subfield mapping table; A half-toning step of half-toning the image signal input from the luminance correction step by at least one method of error diffusion or dithering; And A subfield mapping step of mapping an image signal input from the half toning step to the selected subfield mapping table; Image processing method of a plasma display panel comprising a. The method of claim 9, The motion information generating step A motion amount measuring step of detecting a motion amount of the video signal and calculating a motion amount; A motion level determining step of determining a motion level according to the motion amount of the video signal inputted from the motion amount measuring step; And A subfield mapping table selecting step of selecting any one of the at least two subfield mapping tables according to the motion level inputted from the motion level determining step; Image processing method of a plasma display panel comprising a. The method according to any one of claims 8 to 10, And a motion amount is measured by comparing the gray level values of the previous frame (N-1) and the current frame (N) of the video signal. The method of claim 11, And a frame memory step of storing the image signal on a frame basis. The method according to any one of claims 8 to 10, And as the motion amount of the video signal increases, a subfield mapping table having a larger number of real gray levels is used. The method according to any one of claims 8 to 10, And a subfield mapping table having a smaller number of real gray levels is used as the motion amount of the video signal is smaller.

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