Frame buffering data compression and decompression method and circuit for LCD overdrive

A technology of data compression and frame buffering, applied in the field of image processing, which can solve the problems of flicker, steps, and compression performance degradation.

Active Publication Date: 2009-11-25
ANALOGIX CHINA SEMICON
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Problems solved by technology

[0005] The present invention aims to provide a frame buffer data compression and decompression method and circuit for LCD overdrive, which can solve the problem that larger blocks are required in order to obtain a higher compression ratio of more than 3 times in the prior art. A la

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  • Frame buffering data compression and decompression method and circuit for LCD overdrive
  • Frame buffering data compression and decompression method and circuit for LCD overdrive
  • Frame buffering data compression and decompression method and circuit for LCD overdrive

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Embodiment Construction

[0063] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0064] figure 1 A flow chart of a frame buffer data compression method for LCD overdrive according to an embodiment of the present invention is shown, including the following steps:

[0065] S102, divide the video image into 2×2 blocks;

[0066] S104, calculating gradients in the horizontal direction and vertical direction of the R, G, and B color components of the current block of the video image after the block, to obtain the maximum value of the gradient in the horizontal direction and the vertical direction;

[0067] S106. When it is determined that the gradient of the current block is a gradual change in gray scale according to the maximum value of the gradients in the horizontal direction and the vertical direction, perform gradient incremental encoding on the current block according to the gradient.

[0068] In this embodime...

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Abstract

The invention provides a frame buffering data compression method flow chart for LCD overdrive, including the following steps: executing 2X2 partitioning for the video image, calculating the gradient of the R, G and B color components of the present block in the partitioned video image in the horizontal direction and in the perpendicular direction, obtaining the maximum value of the gradient in horizontal direction and in the perpendicular direction; judging that the gradient of the present block is in the greyscale slow change according to the maximum value of the gradient in horizontal direction and in the perpendicular direction, and executing the gradient increment encoding for the present block according to the gradient. The invention solves the problem in the prior art that the larger block is needed for obtaining over three times of compression ratio, however the larger block size causes the decrease of the compressibility, further the glitter, the step and the like can appear when the bigger anamorphic former frame decompression data is used to execute OverDrive, the movement at the speed being not equal to one half of the block size exists.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a frame buffer data compression and decompression method and circuit for LCD overdrive. Background technique [0002] Due to the sampling and holding principle of LCD (Liquid Crystal Display, liquid crystal display) and the slow response characteristics of liquid crystal molecules themselves compared with CRT (Cathode Ray Tube, cathode ray tube), motion blur will appear when LCD displays moving video images. [0003] In order to reduce motion blur, LCD response time compensation (Response Time Compensation, RTC) is commonly used as a motion blur removal method. Among them, the Over Drive technology is a relatively simple and very effective technology, and its principle is to perform over-drive look-up table according to the image data of two adjacent frames. Therefore, OverDrive needs off-chip RAM to store at least one frame of image compression data. In order to reduce the capac...

Claims

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Application Information

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IPC IPC(8): H04N7/26G09G3/36H04N19/176H04N19/186
Inventor 张文超
Owner ANALOGIX CHINA SEMICON
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