Multi-view distributed video compression side information generation method

A distributed video and side information technology, applied in digital video signal modification, television, image communication, etc.

Inactive Publication Date: 2013-03-27
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Technical problem: The purpose of this invention is to propose a method for generating side information for multi-view distributed video encoding and decoding in wireless multimedia sensor networks, so as to solve the problem of large amount of data in video applications The problem

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  • Multi-view distributed video compression side information generation method

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[0043] Architecture

[0044] Based on the multi-view distributed video coding scheme, this method extracts the intense motion area through the ROI judgment criterion in the main view and extracts the DCT low-frequency coefficients of the area for Huffman decoding and compression. The decoding end uses the decoded DCT low-frequency coefficients to perform two-way motion. Estimation, DCT hash (discrete cosine transform low-frequency coefficients) motion interpolation to generate the best side information, and the rest of the area is based on LDPC distributed codec; the auxiliary view adopts the traditional codec method. Furthermore, while reducing the bit rate, the quality of the decoded image is improved, the processing and transmission energy consumption of nodes is reduced, the optimized transmission of video is realized, and the life cycle of the entire network is extended.

[0045] Based on a multi-view distributed video coding scheme, this method divides the video sequen...

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Abstract

A multi-view distributed video compression side information generation method facing to a wireless multi-media sensing network is a technical scheme directing to multi-media multi-view data compression in the wireless multi-media sensing network. The method comprises extracting discrete cosine transform (DCT) low frequency coefficients in an area-of-interest (ROI) macro block of a non-key frame (Wyner-Zicframe, WZ) in a main visual angle to conduct entropy coding and decoding, using received the DCT low frequency coefficients to conduct both-way motion estimation interpolation on the decoding end of the ROI macro block to generate ROI macro block side information, using encoded frames to conduct motion compensation frame interpolation (or extrapolation) on a non-ROI area to generate non-ROI macro block side information, and further generating best non-key frame time side information. Space side information is generated by using a homography matrix method. Finally the time side information and the space side information are merged. By means of the improvement, code rate is reduced, quality of decoding images is improved, energy consumption of sensor nodes is reduced, and service life of the wireless sensor network is prolonged.

Description

technical field [0001] The invention is a technical proposal for compressing multimedia multi-angle data in wireless multimedia sensor networks (Wireless Multimedia Sensor Networks, WMSN). The main view adopts the distributed video coding method based on DCT hash, and the auxiliary view adopts the traditional video coding method, which reduces the energy consumption of nodes as much as possible and improves the quality of decoded images, which belongs to the field of computer wireless communication technology. Background technique [0002] With the development of wireless multimedia sensor technology, people's requirements for digital video are also increasing day by day. They hope to see clearer and more realistic pictures of natural representation objects. However, traditional single-view video networks can only provide two-dimensional plane vision and cannot provide A better stereoscopic vision sense, so a multi-view video network is produced. However, the data volume of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30H04N19/91
CPCY02B60/50
Inventor 肖甫刘金凯孙力娟王汝传郭剑沙超黄海平蒋凌云
Owner NANJING UNIV OF POSTS & TELECOMM
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