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An Online Update Method for Dynamic Adjustment of Image Compression

A technology of dynamic adjustment and update method, applied in the direction of image communication, digital video signal modification, electrical components, etc., can solve the problem of inability to dynamically correct QP, etc., to achieve the effect of convenient dynamic adjustment

Active Publication Date: 2016-09-14
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In view of the shortcomings of the existing wireless image transmission system, it is impossible to dynamically modify the QP according to the image content information and realize the real-time adjustment of the compression rate. The technical problem to be solved by the present invention is to provide a method that can dynamically modify the quantization coefficient according to the image content information. QP's video dynamic compression completes the online update of the image compression bit rate in the wireless image transmission system

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  • An Online Update Method for Dynamic Adjustment of Image Compression
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  • An Online Update Method for Dynamic Adjustment of Image Compression

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[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] The inventive method such as figure 1 shown, including the following steps:

[0030] 1. Video compression via H.264

[0031] In this implementation example, the YUV image collected by the image acquisition device adopts the standard H.264 encoding technology to perform intra-frame and inter-frame prediction on the image, and compress the image to realize the front-end algorithm compression of the video encoding.

[0032] 2. Calculate the QP value of the key reference frame in a group of image sequences according to the image content information;

[0033] (1) I frame image content information calculation;

[0034] First, the edge detection algorithm is used to detect the gradient information of the key reference frame I frame, and the edge direction histogram of the 8×8 macroblock is established to obtain the most likely prediction mo...

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Abstract

The invention relates to an online updating method for image compression dynamic regulation, in particular to dynamic regulation of the image compression achieved by dynamic calculation, modification and quantification of a coefficient QP in a wireless image transmission system. According to an H.264 international standard, intra-frame predicdion and inter-frame prediction are conducted to YUV images, correlative compression of space and time is realized, and a QP value of key reference frames of an image sequence is calculated according to image content information. According to difference information of the key reference frames and the other frames, energy threshold values of the other frames are calculated, and the QP values of all frames in the image sequence are determined. According to the QP values of all frames in the image sequence, the image sequence is quantified and image coding compression is completed. According to the online updating method for the image compression dynamic regulation, video dynamic compression of the coefficient QP is dynamically modified and quantified according to the image content information, and online updating of image compression bit rate in the wireless image transmission system can be completed.

Description

technical field [0001] The invention relates to an online update method for dynamic adjustment of image compression, in particular to realizing dynamic adjustment of image compression through dynamic calculation and modification of quantization coefficient QP in a wireless image transmission system. Background technique [0002] Wireless image transmission system is a popular field of applied research. Among video codec methods, H.264 video codec is a very popular standard algorithm. This technology has the characteristics of high compression ratio and wide application range. , has been widely used in video conferencing, real-time monitoring and many other fields at home and abroad. It performs compression processes such as intra-frame prediction, inter-frame prediction, and entropy coding on the collected images to realize compressed storage of images. At the decoding end, the H.264 decoding technology is used to decode the received compressed code stream and restore the o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/124H04N19/61
Inventor 赵怀慈王立勇赵大威周雷花海洋刘明第冯安祥王闯任士远
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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