JPH06138858A - Method and processor for image information processing - Google Patents

Abstract

PURPOSE:To display an image which is close to the original image with multiple gradations by artificial expression in the image processing method and image processor for an LCD display by a digital driver. CONSTITUTION:By an error diffusing method which adds 1st error data as the difference between 1st original image data corresponding to the 1st pixel of one frame and the 1st image display data to 2nd original image data corresponding to the 2nd pixel adjoining to the 1st pixel and then uses the high-order L bits of P-bit data as the result of the addition as 2nd L-bit image display data corresponding to an image display of the 2nd pixel. P1: the difference between the 1st original image data and 2nd original image data is calculated P2: when the difference exceeds a certain value, the 2nd original image data and 1st error data are not added and the high-order L bits of the 2nd original image data are used as 2nd image display data corresponding to the image display of the 2nd pixel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image information processing method and an image processing apparatus, and more particularly to an image processing method and an image processing apparatus for making a gradation display of an LCD display by a digital driver multi-gradation. .

[0002]

2. Description of the Related Art An image processing method according to a conventional example, especially L
For the multi-gradation of a CD display, an attempt has been made to obtain an image close to the original image by suppressing false contours by a method generally called an error diffusion method. In this error diffusion method, error data, which is the difference between the original image data corresponding to a pixel and the image display data, is added to the image data of adjacent pixels to make the brightness of the surrounding pixels uniform. Is.

The error diffusion method according to the conventional example is performed by an image information processing apparatus for generating 4-bit image display data (GD) based on 8-bit original image data (SD) as shown in FIG. . The configuration is such that the first latch circuit (1), the adding circuit (2), the multiplexer (3), and the second
Latch circuit (4) and a third latch circuit (5).

In the operation of the device, first, 8-bit original image data (SD) of a pixel is transferred to the first latch circuit (1).
To the adder circuit (2) based on the dot clock (DK). At the same time, the second latch circuit (4)
The error data (EI) corresponding to the pixel processed immediately before that pixel is read. This error data (E
I) is the original image data (SD) and the image display data (G
This is the difference from D). For example, if the original image data (SD) is 8 bits and the image display data (GD) is 4 bits, the image display data (GD) is the original image data (S
Since the upper 4 bits of D) are taken, the error data (EI) in this case is the lower 4 bits of the original image data (SD).

Next, the addition circuit (2) uses the 8-bit original image data (SD) and the 4-bit error data (EI).
Is added to generate 8-bit corrected image data (HD), which is output to the multiplexer (3). In addition,
Since it is troublesome that the data output from the addition circuit (2) becomes "0000" as a result of the carry by the addition processing of the addition circuit (2), in such a case, the carry output from the addition circuit (2) is generated. Multiplexers based on signals (3)
Outputs 4-bit “1111”.

Then, by the multiplexer (3),
The corrected image data (HD) is divided into upper 4 bits and lower 4 bits, the upper 4 bits are output as image display data (GD) to the third latch circuit (5), and the lower 4 bits are the original pixel of the next pixel. The error data (EI) to be added to the image data (SD) is output to the second latch circuit (4). The third latch circuit (5) outputs 4-bit image display data (GD) to an LCD driver (not shown).

According to the above-mentioned conventional device, the error data (EI) of the immediately preceding adjacent pixels are sequentially converted into the original image data (S).
Since it is added to D), the difference in brightness between adjacent pixels is reduced and the brightness of the image is smoothed, so that so-called pseudo contours can be prevented. Further, by performing image processing within the frame, the problem of flicker does not occur at all. In this way, an image close to the original image was obtained.

[0008]

However, in the above-mentioned conventional image processing method using the error diffusion method, the error data (EI) is added to the original image data (SD) of adjacent pixels uniformly regardless of the state of the image. Then, since the difference in luminance between the adjacent pixels is reduced, for example, in the edge portion of the image where the image changes abruptly, the difference in luminance between the adjacent pixels is reduced, so that the edge of the image is reduced. There was a problem that it was displayed blurry.

[0009]

The present invention has been made in view of the above-mentioned conventional drawbacks, and as shown in the flow chart of FIG. 1, the first original image data corresponding to the first pixel in one frame. Which is an error between the first image display data and
Error data is added to the second original image data corresponding to the second pixel adjacent to the first pixel, and the upper L bits of the P-bit data as the result of the addition processing are added to the second original image data. In the error diffusion method used as the L-bit second image display data corresponding to the image display of the pixel, the difference between the first original image data and the second original image data is calculated, and the difference is If the value exceeds a certain value, the second
Of the second original image data is used as the second image display data corresponding to the image display of the second pixel, without performing the addition process of the original image data of 1) and the first error data. Accordingly, the present invention provides an image information processing method and an image information processing apparatus capable of preventing blurring at an edge portion of an image where the image sharply changes.

[0010]

[Operation] According to the image information processing method of the present invention, as shown in the flowchart of FIG. 1, the difference between the first original image data and the second original image data is calculated, and the difference is constant. When it exceeds the value, the upper L bits of the second original image data correspond to the image display of the second pixel without performing the addition process of the second original image data and the first error data. Second
Is used as image display data.

Therefore, at the edge of the image where the image changes abruptly, there is a large difference between the original image data of the two pixels sandwiching the edge of the image, so that error data is not added to the adjacent pixels. Therefore, it becomes possible to prevent the blurring of the edge of the image caused by the difference in the brightness of the pixels sandwiching the edge being reduced, and to display an image in which the edge of the image is clear and close to the original image. Will be possible.

Further, according to the image information processing apparatus of the present invention, as shown in FIG. 2, the addition means, the information generation means, the holding means, and the comparison means are provided. For example,
The holding unit temporarily holds the first original image data and outputs it to the comparing unit, and the adding unit causes an error between the first original image data corresponding to the first pixel in one frame and the first image display data. The first error data that is the minute is the first
Is added to the second original image data corresponding to the second pixel adjacent to the pixel to generate P-bit data,
The P-bit data or the second original image data, which is the result of the addition processing of the first error data and the second original image data, is output to the information generating means, and based on the drive control signal by the information generating means. The upper L bits are output as the second image display data corresponding to the second pixel, the difference between the first original image data and the second original image data is obtained by the comparison means, and the difference is When the value exceeds the certain value, the drive control signal is output to the information generating means, and when the value does not exceed the certain value, the drive control signal is not output.

For this reason, for example, at the location where the image sharply changes by the comparing means, the drive control signal is output to the information generating means, and when the drive control signal is output, the information generating means causes the adjacent pixels to be adjacent. It is possible to cause the upper L bits of the original image data to be used as the image display data without any error diffusion. Accordingly, by appropriately setting the constant value, it is possible to prevent the addition processing of the original image data and the error data of the pixels adjacent to each other across the edge at the edge where the image sharply changes. Therefore, the image information processing method according to the present invention can be realized.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image information processing apparatus and an image information processing method according to the present invention will be described in detail below with reference to FIGS. An image information processing apparatus according to an embodiment of the present invention includes an output unit that outputs original image data (not shown), and an L unit.
It is installed between the LCD driver that drives the CD display and compresses the original 8-bit image data to 4
4-bit input LC as data for bit image display
This is a device for outputting to the D driver.

In such a case, the lower 4 bits of the 8 bits of the original image data are discarded, and only the upper 4 bits are used as the image display data. Therefore, since only 2 ⁴ = 16 gradations can be obtained in this state, it is necessary to perform pseudo gradation processing to approximate the original image by pseudo expression. Note that only red (R) color data will be described here. Since the same processing is performed in parallel by the same device for each of blue and green, the description thereof is omitted.

As shown in FIG. 3, the image information processing apparatus according to one embodiment of the present invention includes a first latch circuit (11), a second latch circuit (12), a comparison circuit (13), and an addition circuit. (14), a first multiplexer (15), a second multiplexer (16), a third latch circuit (17) and a fourth latch circuit (18). In the following, the Nth
The nth pixel in the th frame is referred to as the “[N, n] th pixel”.

The first latch circuit (11) temporarily holds the input 8-bit original image data (SD) of each pixel, and the second latch circuit (12), based on the dot clock (DK). It is a circuit for outputting to the comparison circuit (13) and the addition circuit (14). Second latch circuit (12)
Is, for example, when processing the [N, n] th pixel, the original image data (SD) of the [N, n] th pixel and the [N, n] th pixel
In order to compare the original image data (SD) of the (n−1) th pixel, the original image data (SD) of the [N, n−1] th pixel
Is held for one frame and is output to the comparison circuit (13).

The comparison circuit (13) outputs the original image data (SD) of the [N, n-1] th pixel output from the second latch circuit (12) and the [N, n] th pixel. The difference from the original image data (SD) is calculated, and when the difference exceeds a threshold value set in advance, the drive control signal (DS) is output to the second multiplexer (16). . The adder circuit (14) outputs 4-bit error data (EI) of the [N, n-1] pixel read from the third latch circuit (17) and the first latch circuit (11). The original image data (SD) of the 8-bit [N, n] pixel is added to generate the corrected image data (HD) of the 8-bit [N, n] pixel. It is output to the multiplexer (15).

The first multiplexer (15) outputs the corrected image data (HD) of the 8-bit [N, n] pixel to the second multiplexer (16). The second multiplexer (16) is an 8-bit [N, n] pixel input from the first multiplexer (15) based on the drive control signal (DS) output from the comparison circuit (13). Corrected image data (HD) and the 8-bit [N, N-bit input from the first latch circuit (11).
The error data (E) of the 4-bit [N, n] pixel based on either the original image data (SD) of the
I) and 4-bit image display data (GD) of the [N, n] th pixel and outputs the image display data (GD) to the third latch circuit (17) and the fourth latch circuit (18), respectively. Is.

For example, when the drive control signal (DS) is output from the comparison circuit (13), the [N, n] th pixel is based on the original image data (SD) of the [N, n] th pixel. When the image display data (GD) and the error data (EI) of the pixel are generated and the drive control signal (DS) is not output, based on the corrected image data (HD) of the [N, n] th pixel. Image display data (GD) and error data (EI) of the [N, n] th pixel are generated.

The third latch circuit (17) holds the error data (EI) for one pixel and outputs it to the adder circuit (14). The fourth latch circuit (18) outputs the image display data (GD) to an LCD driver (not shown) based on the dot clock (DK). As described above, according to the image information processing apparatus according to the embodiment of the present invention, the adder circuit (14), the second multiplexer (16), the second latch circuit (12), and the comparison circuit ( 13) and are provided.

For example, when processing the [N, n] th pixel by the second latch circuit (12), the [N, n−] th pixel is processed.
1] the original image data (SD) of the pixel is temporarily stored and output to the comparison circuit (13), and the addition circuit (14) outputs the error data (EI) of the [N, n-1] pixel Addition processing is performed on the original image data (SD) of the [N, n] pixel to generate corrected image data (HD) of the 8-bit [N, n] pixel, and the second multiplexer (16)
To the [N, n−
1] The original image data (SD) of the pixel and the original image data (SD) of the [N, n] th pixel are calculated. If the difference exceeds a certain value, drive control is performed. When the signal (DS) is output to the second multiplexer (16) and does not exceed a certain value, the drive control signal (DS) is not output.

When the drive control signal (DS) is input to the second multiplexer (16), error diffusion is not performed, and the upper 4 bits of the original image data (SD) of the [N, n] th pixel are When the image display data (GD) of the [N, n] th pixel is output and the drive control signal (DS) is not input, the 8-bit [N, n] thresult of the error diffusion is output.
The upper 4 bits of the corrected image data (HD) of the pixel of are output as the image display data (GD) of the [N, n] th pixel.

Therefore, at the location where the image changes abruptly, the comparison circuit (13) is added to the second multiplexer (16).
Outputs a drive control signal (DS) from the second multiplexer (1) when the drive control signal (DS) is output.
By 6), error diffusion is not performed, and the upper 4 bits of the original image data (SD) of the [N, n] th pixel are directly used as image display data (GD).

Thus, by appropriately setting a constant value, a portion where the image changes abruptly (for example, an edge of the image)
Then, the original image data (S
Since it is possible to prevent the addition processing of D) and the error data (EI) from being performed, the image information processing method according to the embodiment of the present invention can be realized. Hereinafter, an image information processing method according to an embodiment of the present invention will be described while supplementing the operation of the apparatus. 4 to 6 are flowcharts illustrating the image information processing method according to this embodiment.

First, in step P1 of FIG. 4, 8-bit [1,1] original image data (SD) corresponding to the [1,1] pixel which is the first pixel of the first frame. ) Hold. At this time, the first [1,1] original image data (S
D) is input and held in the second latch circuit (12) via the first latch circuit (11).

Next, in step P2, the upper 4 bits of the [1,1] th original image data (SD) are assigned to the [1,1] th image display data ( GD), and the lower 4 bits are held as the [1,1] th error data (EI) corresponding to the [1,1] th pixel. At this time, the [1,1] original image data (SD) is output from the first latch circuit (11) to the second multiplexer (16), and the second multiplexer (16) outputs
The 8-bit original image data (SD) is divided into upper 4 bits and lower 4 bits. Of these, the upper 4 bits are output as the [1, 1] image display data (GD) to the fourth latch circuit (18) and are output to an LCD driver (not shown) in synchronization with the dot clock (DK). It on the other hand,
The lower 4 bits are output to and held in the third latch circuit (17) as [1,1] error data (EI).

Then, in step P3, an initial condition setting process for n = 2 is performed. Next, in step P4, the [1, n] th original image data (SD) is held. At this time, the [1, n] original image data (SD) is input and held in the second latch circuit (12) via the first latch circuit (11). Then, in step P5, the first [1,
The difference between the [n] original image data (SD) and the [1, n-1] th original image data (SD) is calculated, and a determination process is performed as to whether or not the difference exceeds a preset constant value. . If the difference exceeds a certain value (Yes), then the step P6 is performed.
If it does not exceed the constant value (No), the process proceeds to step P7.

At this time, the [1, n] th original image data (SD) from the first latch circuit (11) and the [1, n-1] th original image from the second latch circuit (12). Data (S
D) is input to the comparison circuit (13), and the difference between the two is taken by the comparison circuit (13) and compared with a threshold value set inside. If the difference exceeds the threshold value, the drive control signal (DS) is output to the second multiplexer (16). If the difference does not exceed the threshold value, the drive control signal (DS) is not output.

Since n = 2 at the beginning, the first [1,
The difference between the [1] original image data (SD) and the [1,2] original image data (SD) is obtained. Next, in step P6, the upper 4 bits of the [1, n] original image data (SD) is set to the [1, n] image display data (GD).
And the lower 4 bits are the [1, n] error data (E
I).

At this time, the second multiplexer (16) selects the [1, n] th original image data (SD) based on the output of the drive control signal (DS), and the [1, n] th The upper 4 bits of the original image data (SD) are output to the fourth latch circuit (18) as the [1, n] th image display data (GD), and are not shown in synchronization with the dot clock (DK). It is output to the LCD driver. on the other hand,
The lower 4 bits are output to and held in the third latch circuit (17) as [1, n] error data (EI).

Then, in step P7, the [1, n] th original image data (SD) and the [1, n-1] th error data (EI) are added to perform the addition processing. Corrected image data (HD) is created, the upper 4 bits of the [1, n] corrected image data (HD) are the [1, n] image display data (GD), and the lower 4 bits are the [ 1, n] error data (EI).

At this time, the 8-bit [1, n] original image data (SD) from the first latch circuit (11) is transferred to the 4-bit [1, n] original image data (SD) from the third latch circuit (17). −
1] error data (EI) is added to the addition circuit (1
4), both are added by the addition circuit (14), and the 8-bit [1, n] corrected image data (H
D) is created and output to the second multiplexer (16). At this time, since the drive control signal (DS) is not output, the [1, n] th corrected image data (HD) is selected, and the second multiplexer (16) outputs 8
The upper 4 bits of the bit [1, n] corrected image data (HD) are selectively output to the fourth latch circuit (18),
The data is output to an LCD driver (not shown) in synchronization with the dot clock (DK). On the other hand, the lower 4 bits are the first [1, n]
Error data (EI) of the third latch circuit (17)
Is selectively output to and held.

At this time, it is troublesome that the data output from the adding circuit (14) becomes "00000000" as a result of the carry by the adding process of the adding circuit (14).
In such a case, the first multiplexer (15) is based on the carry signal output from the adder circuit (14).
Output 8-bit "11111111". Next, in step P8, 1 is added to n.

Then, in step P9, it is determined whether or not the processing for the first frame is completed. When it is completed (Yes), the process proceeds to step P9, and when it is not completed (No), the process returns to step P4 and the above process is repeated again. Next, step P1 of the flowchart of FIG.
When 0, N = 2 is set as the initial condition. Subsequent processing is processing after the second frame.

Next, in step P11, the [N, 1] th original image data (SD) is held. At this time, the [N,
1] the original image data (SD) of the first latch circuit (1
It is input and held in the second latch circuit (12) via 1). Next, in Step P12, the upper 4 bits of the [N, 1] th original image data (SD) are set to the [N, 1] th image display data (GD) corresponding to the [N, 1] th pixel. ,
The lower 4 bits correspond to the [N, 1] pixel and the [N,
The error data (EI) of 1] is held.

At this time, the [N, 1] th original image data (SD) is output from the first latch circuit (11) to the second multiplexer (16), and the second multiplexer (16) outputs the same. The 8-bit original image data (SD) is divided into upper 4 bits and lower 4 bits. this house,
Upper 4 bits are the [N, 1] image display data (GD)
Is output to the fourth latch circuit (18) and is output to an LCD driver (not shown) in synchronization with the dot clock (DK). On the other hand, the lower 4 bits are output to and held in the third latch circuit (17) as the [N, 1] th error data (EI).

Then, in step P13, the initial condition setting process for n = 2 is performed. Next, in Step P14, the [N, n] th original image data (SD) is held. At this time, the [N, n] th original image data (SD) is input / held to the second latch circuit (12) via the first latch circuit (11). Then, in Step P15, the [N,
The difference between the [n] original image data (SD) and the [N, n−1] th original image data (SD) is calculated, and a determination process is performed as to whether the difference exceeds a preset constant value. . If the difference exceeds a certain value (Yes), then step P1
When it moves to 6 and does not exceed the fixed value (No), it moves to Step P17.

At this time, the [N, n] th original image data (SD) from the first latch circuit (11) and the [N, n-1] th original image from the second latch circuit (12). Data (S
D) is input to the comparison circuit (13), and the difference between the two is taken by the comparison circuit (13) and compared with a threshold value set inside. If the difference exceeds the threshold value, the drive control signal (DS) is output to the second multiplexer (16). If the difference does not exceed the threshold value, the drive control signal (DS) is not output.

Next, at step P16, the upper 4 bits of the [N, n] original image data (SD) are set to the [N, n] image display data (GD), and the lower 4 bits are set to the [N]. ，
n] error data (EI). At this time, by outputting the drive control signal (DS), the second multiplexer (16) selects the [N, n] th original image data (SD), and the [N, n] th original image data is selected. The upper 4 bits of the image data (SD) are output to the fourth latch circuit (18) as the [N, n] th image display data (GD), and the LCD (not shown) is synchronized with the dot clock (DK).
It is output to the driver. On the other hand, the lower 4 bits are the [N,
n] error data (EI) of the third latch circuit (1
It is output to 7) and held.

Then, in step P17, the [1, n] -th
Of the original image data (SD) and the [1, n-1] th error data (EI) are added to create the [1, n] th corrected image data (HD). The upper 4 bits of the [n] corrected image data (HD) are the [1, n] image display data (GD), and the lower 4 bits are the [1, n] error data (EI).

At this time, the 8-bit [N, n] original image data (SD) from the first latch circuit (11) and the 4-bit [N, n] original image data from the third latch circuit (17). −
1] error data (EI) is added to the addition circuit (1
4), both are added by the addition circuit (14), and the 8-bit [N, n] -th corrected image data (H
D) is created and output to the second multiplexer (16).

At this time, since the drive control signal (DS) is not output, the [N, n] th corrected image data (HD) is selected, and the second multiplexer (16) outputs 8
The upper 4 bits of the [N, n] -th corrected image data (HD) of bits are selectively output to the fourth latch circuit (18),
The data is output to an LCD driver (not shown) in synchronization with the dot clock (DK). On the other hand, the lower 4 bits are the [N, n]
Error data (EI) of the third latch circuit (17)
Is selectively output to and held.

At this time, it is troublesome that the data output from the adding circuit (14) becomes "00000000" as a result of the carry by the adding process of the adding circuit (14).
In such a case, the first multiplexer (15) is based on the carry signal output from the adder circuit (14).
Output 8-bit "11111111". Next, in step P18 of the flowchart of FIG. 6, 1 is added to n.

Then, in step P19, it is determined whether or not the processing of the Nth frame is completed. When it is completed (Yes), the process proceeds to step P20, and when it is not completed (No), the process returns to step P14 and the above process is repeated again. Next, in step P20, 1 is added to N. Then, in step P21, a determination process is performed as to whether or not all the processes have been completed. If finished (Y
es) ends, and when not ended (No), the process returns to step P14 and the above process is repeated again.

In this way, by repeating the above processing, the [1,1] th pixel, the [1,2] th pixel,
The [1,3] th pixel, the [1, n] th pixel, the [2nd
1] pixel, [2,2] pixel ..., [2, n] pixel, [3,1] pixel, [3,2] pixel, ..
The [N, 1] th pixel, the [N, 2] th pixel, ..., The [N, n] th pixel ,.

As described above, according to the image information processing method in the embodiment of the present invention, as shown in steps P15 to P17 of the flowchart of FIG. 5, the [N, n] th original image data (SD ) And the [N, n−1] th original image data (SD), and when the difference exceeds a preset constant value, the [N, n] th original image data (SD) If the upper 4 bits of SD) are the [N, n] th image display data (GD) and the lower 4 bits are the [N, n] error data (EI), and the difference does not exceed a certain value, [1, n] original image data (SD) and [1, n-1]
Error data (EI) is added to generate [1, n] th corrected image data (HD), and the upper 4 bits of the [1, n] th corrected image data (HD) , N] image display data (GD), and the lower 4 bits are the first [1,
n] error data (EI).

Therefore, at the edge of the image where the image changes abruptly, since the difference between the original image data sandwiching the edge is large, the error data is not added to the adjacent pixels, and the [N, n] th pixel is not added. 4 bits of the original image data (SD) are directly used as the [N, n] th image display data (GD), and the lower 4 bits are set to the [N, n] error data (E).
I). Therefore, it is possible to prevent blurring at the edge due to the reduction in the difference in luminance between the two pixels sandwiching the edge, and it is possible to display an image in which the edge of the image is clear and close to the original image.

In this embodiment, the second latch circuit (12) is used as an example of the holding means, the comparison circuit (13) is used as an example of the comparison means, and the addition circuit (14) is used as an example of the addition means. The second multiplexers (16) are used as an example of the generating means, but the configuration of the present invention is not limited to this. Further, although the present embodiment describes the device of 8-bit input-4 bit output, the present invention is not limited to this, and may be, for example, a device of 8-bit input-3 bit output or a device of 6-bit input-3 bit output. Is also applicable.

[0050]

As described above, according to the image information processing method of the present invention, the difference between the first original image data and the second original image data is calculated, and the difference is a constant value. When it exceeds, the upper L bits of the second original image data are not added to the second original image data and the first error data is not added, and the second upper image data corresponding to the image display of the second pixel is displayed. Is used as image display data.

For this reason, in the edge portion of the image where the image sharply changes, error data is not added to the adjacent pixels, so that it is possible to display an image with sharp edges and close to the original image. . Further, according to the image information processing apparatus of the present invention, an addition unit, an information generation unit,
The holding means and the comparison means are provided.

For this reason, the drive means outputs the drive control signal to the information generating means at the position where the image sharply changes by the comparing means. When the drive control signal is output, the information generating means does not cause error diffusion. The upper L bits of the original image data are directly used as the image display data. This allows
Since it is possible not to add the original image data and the error data of the adjacent pixels in the portion where the image sharply changes, the image information processing method according to the present invention can be realized.

[Brief description of drawings]

FIG. 1 is a flowchart illustrating the principle of an image information processing method according to the present invention.

FIG. 2 is a principle diagram of an image information processing apparatus according to the present invention.

FIG. 3 is a configuration diagram of an image information processing apparatus according to an embodiment of the present invention.

FIG. 4 is a first flowchart illustrating an image information processing method according to an embodiment of the present invention.

FIG. 5 is a second flowchart illustrating an image information processing method according to an embodiment of the present invention.

FIG. 6 is a third flowchart illustrating an image information processing method according to an embodiment of the present invention.

FIG. 7 is a configuration diagram of an image information processing apparatus according to a conventional example.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhiko Moriwaki 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Makoto Shimizu 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Denki Co., Ltd. (72) Inventor Hisao Uehara 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. P based on P-bit original image data
An image information processing method for generating L-bit image display data having a number of bits smaller than bits, comprising: first original image data and first image display data corresponding to a first pixel in one frame; Of the P-bit data that is the result of the addition processing after adding the first error data corresponding to the second original image data corresponding to the second pixel adjacent to the first pixel. The upper L bit is the second
In the error diffusion method used as the L-bit second image display data corresponding to the image display of the pixel, the difference between the first original image data and the second original image data is calculated, and the difference is If the value exceeds a certain value, the upper L bits of the second original image data are set to the image of the second pixel without performing the addition process of the second original image data and the first error data. An image information processing method characterized by using as second image display data corresponding to display. 2. P based on P-bit original image data
An image information processing apparatus for generating L-bit image display data having a smaller number of bits than bits, comprising: first original image data and first image display data corresponding to a first pixel in one frame. Error data of the first error data is added to the second original image data corresponding to the second pixel adjacent to the first pixel to generate P-bit data, Based on the addition means for outputting and the drive control signal, the P-bit data that is the addition processing result or the upper L bits of the second original image data is used as the second image display data corresponding to the second pixel. An information generating unit that outputs the first original image data, a holding unit that temporarily holds the first original image data and outputs the first original image data to a comparing unit, and a difference between the first original image data and the second original image data. , The difference exceeds a certain value. In this case, the drive control signal is output to the information generating means, and when the drive control signal does not exceed a certain value, the drive control signal is not output to the information generating means. Image information processing device.