Method, device and system for compressing and decompressing transparent images

Abstract

The invention discloses a method, a device and a system for compressing and decompressing transparent images and belongs to the field of digital images. The method comprises the following steps of: acquiring color channel information and transparent color channel information of original transparent images; performing loss compression on the color channel information to obtain color channel compression information, and performing lossless compression on the transparent color channel information to obtain transparent color channel compression information; and performing compression data synthesis on the color channel compression information and the transparent color channel compression information to obtain compressed transparent images. By the scheme provided by the invention, the transparent color channel information of the transparent images is subjected to lossless compression, while the color channel information is subjected to loss compression, the compressed transparent color channel information and color channel information are organized according to a specific format, redundancy contained in the image information is removed to the greatest extent, the compression efficiency of the transparent images is improved and the subjective quality of the images is not obviously reduced.

Description

technical field [0001] The invention relates to the field of digital images, in particular to a method, device and system for compressing and decompressing transparent images. Background technique [0002] With the development and widespread application of Internet technology, the network is increasingly affecting people's work and lifestyle. Because the picture information has the characteristics of strong intuition and rich content, a large number of pictures are used in websites and online games. Each pixel of these color digital images usually contains three color channel information of red (R), green (G), and blue (B), and each color channel information of each pixel generally needs to be represented by 8 bits . [0003] Transparent images are images that are widely used in Internet webpage production and games. It is based on general color digital images, adding an 8-bit transparent color channel to each pixel, and recording the transparency information of the pixel....

AI Technical Summary

Problems solved by technology

[0006] For transparent images, the lossless compression method is adopted without removing redundant data such as spatial redundancy and visual redundancy contained in the image information, so the compression efficiency is far lower than JPEG (Joint Photographic Experts Group, Joint Photographic Experts Group), JPEG2000 and other commonly used The image lossy compression standard consumes a lot of storage space and bandwidth resources during image storage and network transmission; if the lossy compression method is used, the transparent color channel information in the transparent image will be lost during the compression process, which affects the image the quality of

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