Image compression method and device integrating hybrid coding and wordbook coding

A hybrid coding and image compression technology, applied in image communication, digital video signal modification, television, etc., can solve problems such as image layering or inaccurate block classification

Inactive Publication Date: 2009-04-29
TONGJI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide an image compression method and device integrating hybrid coding and dictionary coding, which solves the problems of image layering or inaccurate block classification in the compression of composite images in traditional image compression methods

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  • Image compression method and device integrating hybrid coding and wordbook coding
  • Image compression method and device integrating hybrid coding and wordbook coding
  • Image compression method and device integrating hybrid coding and wordbook coding

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Embodiment Construction

[0101] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0102] Both text / graphics and natural images have their own relatively mature compression methods. At present, H.264 based on the hybrid coding framework is the most effective method for natural video compression, and for text / graphics, Gzip compression based on the LZ (Lempel-Ziv) dictionary coding algorithm is undoubtedly a very effective method, the present embodiment Composite images are compressed using H.264 and Gzip adaptive methods, the specific compression process is as follows Figure 9 shown, including the following steps:

[0103] (1) Divide the image into multiple non-overlapping 16 x 16 macroblocks.

[0104] (2) For each macroblock, use H.264 and Gzip to compress respectively.

[0105] (3) In H.264 and Gzip, the compressed data generated by the method with fewer compressed bits is selected and put into the compressed code stream.

[01...

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Abstract

The invention relates to an image compression method and a device with the integration of hybrid coding and dictionary coding, each macroblock is respectively compressed by adopting the hybrid coding method and the dictionary coding method, and compressed data which is generated by the method with fewer coding bits is finally selected to be placed in a compressed code stream. When the dictionary coding method is used for compressing each macroblock, the use of one of the following two methods can effectively improve the compression performance of an image: (1) the latest R (R is the number of data which is larger than one macroblock) bytes of data of the original image is taken as a dictionary. (2) the latest R (R is the number of data which is larger than one macroblock) bytes of data of the recovered image is taken as the dictionary. Compared with the prior art, the invention avoids the degradation of the compression performance of the past literature caused by image stratification or inaccurate block classification and improves the compression performance of the whole composite image compression method.

Description

technical field [0001] The invention relates to the relevant technical field of computer image compression, in particular to an image compression method and device integrating hybrid coding and dictionary coding. Background technique [0002] With the rapid development of network information technology, the interconnection between multiple computers and between hosts and other digital devices has become a reality and has become a development trend. This makes real-time screen transmission from server to client an urgent need. Due to the large amount of screen video data that needs to be transmitted, taking a 24-bit true-color screen image with a size of 1280 x 1024 as an example, the data that needs to be transmitted at 60 frames per second exceeds 200M bytes. If so much data needs to be transmitted on the current network Real-time transmission is impossible under these conditions, so effective data compression is essential. [0003] The prominent feature of computer scree...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32H04N19/13H04N19/176H04N19/503H04N19/56
Inventor 林涛王淑慧
Owner TONGJI UNIV
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