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Method for optimizing rate distortion in video image compression

A video image, rate-distortion technology, applied in image communication, digital video signal modification, television, etc., can solve the problems of low rate-distortion evaluation accuracy and poor image compression performance, and achieve the effect of improving evaluation accuracy and enhancing performance

Inactive Publication Date: 2009-09-02
SHENZHEN TEMOBI SCI &TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for optimizing rate-distortion in video image compression, aiming to solve the problem of poor image compression performance caused by low evaluation accuracy of rate-distortion in video image compression in the prior art

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  • Method for optimizing rate distortion in video image compression

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[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040] When estimating the rate-distortion, the present invention introduces the encoding input parameters and the transformed frequency-domain energy distribution into the evaluation parameters at the same time, thereby calculating the rate-distortion value according to the evaluation parameters, and then performing Lagrange linear approximation to obtain the optimal rate-distortion value, improving the accuracy of the rate-distortion assessment.

[0041] figure 1 It shows the flow of the method for optimizing rate-distortion in video image compression in the present invention, and the process is...

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Abstract

The invention relates to the field of video image processing and provides a method for optimizing rate distortion in video image compression. The method comprises the following steps of A. carrying out transformation from spatial domain to frequency domain on the acquired image by a coder and generating frequency domain energy distribution after transformation; B. evaluating the optimizing value of the rate distortion by the coder according to coding input parameters and the frequency domain energy distribution; and C. controlling the coding compression of the image by the coder according to the optimizing value of the rate distortion. When estimating the rate distortion, compared with the prior art, the invention is characterized in that evaluation parameters are introduced into the coding input parameters and the frequency domain energy distribution after transformation at the same time, thus evaluating the optimizing value of the rate distortion according to the evaluation parameters, improving the evaluation precision and further enhancing the image compression performance.

Description

technical field [0001] The invention relates to the field of video image processing, more specifically, to a method for optimizing rate-distortion in video image compression. Background technique [0002] For modern video compression technology, a hybrid coding framework is generally used. Such a coding framework generally provides a series of tools and algorithms such as motion search, spatial texture prediction, transform coding, and entropy coding. According to information theory, for image regions with different characteristics, entropy changes greatly, and its theoretical maximum compression rate fluctuates, so different tools are required to implement compression. In terms of encoding methods and the selection of encoding and compression tools, modern encoding theory and H.264, MPEG-4, H.264, etc., which have been adopted as international standards, all use the Rate-Distortion Optimization (Rate-Distortion Optimization) method. [0003] The rate-distortion optimizatio...

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Application Information

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IPC IPC(8): H04N7/26
CPCH04N7/26079H04N19/00781H04N7/26329H04N19/00296H04N7/26154H04N19/00563H04N19/00175H04N7/50H04N19/0009H04N7/2625H04N19/48H04N19/124H04N19/147H04N19/18H04N19/61
Inventor 马国强
Owner SHENZHEN TEMOBI SCI &TECH
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