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High quality side information production method

A side information, high-quality technology, applied in the field of image processing, can solve the problem of low accuracy of side information

Inactive Publication Date: 2016-09-14
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that the accuracy of side information in the prior art is not high, the technical problem to be solved by the present invention is to provide a method for generating high-quality side information

Method used

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Embodiment Construction

[0091] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0092] Such as figure 1 As shown, the encoding process of the WZ frame includes:

[0093] 1.1 First perform 2 on the WZ frame M Quantization processing to form a quantized symbol stream q, in which the quality of the quantized value directly affects the effect of side information reconstruction;

[0094] 1.2 Then extract the bit planes according to the importance of the symbol stream q, and finally use the Turbo encoder to independently encode the decomposed quantized coefficients;

[0095] 1.3 After encoding, the check bits are cached in the buffer, and the decoder can request the encoder to send these check bits through the feedback channel to assist in generating side information.

[0096] The decoding process of WZ frame:

[0097] 2.1 Perform moti...

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Abstract

The invention provides a high quality side information production method. The method comprises the steps of determining forward motion estimation or backward motion estimation by correlations between a WZ (Wyner-Ziv) frame and adjacent reference key frames, wherein the adjacent reference key frames comprise a forward reference key frame and a backward reference key frame; for the current block of the WZ frame, taking corresponding points of four motion vectors with time and space correlations as search start point candidate points; calculating SAD values of the current block and corresponding blocks determined by the motion vectors of the search start point candidate points, and selecting the corresponding block with the minimum SAD value as the search start point; determining the size of a search window in a horizontal direction and an upright direction after the search start point is obtained; carrying out matching search on macro blocks after the search start point and the search window are determined, thereby obtaining motion vectors MV; carrying out block matching by using blocks with changeable sizes, thereby obtaining the more accurate and finer motion vectors MV; correcting the motion vectors MV obtained through unidirectional estimation based on a bidirectional motion estimation method; and carrying out bidirectional motion compensation on weighted overlapping blocks.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for generating high-quality side information. Background technique [0002] The distributed video coding framework is a brand-new asymmetric video compression framework, which independently encodes each video frame at the encoding end (i.e., intra-frame encoding), and jointly decodes each video frame at the decoding end (i.e., inter-frame encoding). decoding). [0003] Among them, high-quality side information has a very important influence on improving the performance of distributed video coding. The side information is mainly generated by reference key frames adjacent to the WZ frame to be decoded (Wyner-Ziv). The more similar the side information is to the current frame, the better the side information will be generated, the lower the probability of errors in the decoding process, and the fewer check bits requested by the decoding end from the encoding end....

Claims

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Application Information

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IPC IPC(8): H04N19/154H04N19/176H04N19/80H04N19/513H04N19/56
CPCH04N19/154H04N19/176H04N19/513H04N19/56H04N19/80
Inventor 程德强刘洋姜海龙寇旗旗张国鹏刘海丁丁
Owner CHINA UNIV OF MINING & TECH
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