A coding method and coding system for screen display information

Abstract

The invention discloses a method and system for coding screen display information. The method comprises the steps that pixel points of original screen display information to be coded are collected and original pixel values are obtained so that original screen information data can be obtained; after loss coding is conducted on the original screen display information to be coded, decoding is conducted, so that the pixel value of each pixel point is obtained after decoding is conducted; after a difference value of an original pixel value of each pixel point and the decoded pixel value exceeds a preset threshold value, the pixel point is selected to serve as a lossless pixel point, the pixel value of the lossless pixel point is removed from original screen information data, and therefore first screen information data can be obtained; after the pixel value of the lossless pixel point is placed in the position, corresponding to the pixel point, of the lossless screen information data, lossless coding is conducted, loss coding is conducted on the first screen information data, and the values obtained through the two times of coding are final coding results. The method and system for coding the screen display information can conduct actual coding on the information displayed by a computer screen, and therefore the information displayed by the screen is still clear after being decoded.

Description

technical field [0001] The invention relates to the field of computers, in particular to a coding method and coding system for information displayed on a screen. Background technique [0002] In many industries, it is usually necessary to save or transmit the information displayed on the current computer screen to another device. However, the information displayed on the computer screen is often complex, with high resolution and large amount of information. Therefore, how to display on the screen Information encoding has become a major topic of research in the industry. [0003] In the prior art, when statically encoding the information displayed on the computer screen, the following methods are usually adopted: [0004] (1) Lossy encoding, such as: JPEG, JPEG2000, etc.; when encoding video, the encoding rate is high, and when encoding computer graphics, such as text, application windows, reports, etc., the encoding rate is low, so that the decoded graphics are not clear; ...

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Problems solved by technology

[0004] (1) Lossy encoding, such as: JPEG, JPEG2000, etc.; when encoding video, the encoding rate is high, and when encoding computer graphics, such as text, application windows, reports, etc., the encoding rate is low, so that the decoded graphics are not clear;

[0005] (2) Lossless encoding, such as: PNG; when encoding computer characters, the encoding rate is high, and when encoding photos, the encoding rate is low;

[0006] (3) A variety of coding methods are mixed, that is, the screen is divided into several blocks (blocks), and the several blocks are classified according to the frequency components and contents of the block pixel changes, and the corresponding coding methods are used to encode several blocks separately; but , the boundaries of some computer graphics and video cannot be completely belonged to different blocks, or a complete graphics or image area is divided into multiple different blocks, due to the use of different encoding algorithms, it will make the corresponding The block's display area or its borders are visually unclear after decoding

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