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Distributed video coding system with combined pixel domain-transform domain

A distributed video and encoding system technology, applied in the direction of digital video signal modification, television, image communication, etc., can solve the problems of loss, difficulty in improving the overall performance, and more useful information, so as to reduce the loss of useful information , Improve rate-distortion performance and compression efficiency, and improve the effect of rate-distortion performance

Inactive Publication Date: 2011-04-20
XIDIAN UNIV
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Problems solved by technology

[0005] At present, the transform domain distributed video coding system has become the main object of research due to its higher compression efficiency and performance. In this system, the combined operation of DCT and quantization by coefficient subband often brings more useful The loss of information makes it difficult to greatly improve the overall performance of the system
In terms of side information construction, the currently commonly used side information construction method is obtained by interpolating two key frames before and after, but even if the interpolated side information has been estimated sufficiently accurately, there is still a certain difference between it and the original image. , especially when the motion of the image sequence is severe, this difference will be very obvious

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Embodiment Construction

[0045] refer to figure 1 , the distributed video coding system combining the pixel domain and the transform domain of the present invention consists of three parts: an encoding end, a decoding end and a feedback channel, wherein:

[0046] Coding end: used to divide the input video frame into key frames and Wyner-Ziv frames, and perform H.264 / AVC intra-frame coding and Wyner-Ziv coding on the key frames and Wyner-Ziv frames respectively. It is mainly composed of H.264 / AVC intra-frame encoder, pixel domain processor at the encoding end, transformation module, quantization module and LDPC encoding module. Among them, the H.264 / AVC intra-frame encoder selects the quantization factor according to the quality requirements to send the key frame for encoding, and sends the obtained compressed code stream to the decoding end; the pixel domain processor at the encoding end divides the Wyner-Ziv frame into There are two types of pixel domain information with low error rate and high corr...

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Abstract

The invention discloses a distributed video coding system with combined pixel domain-transform domain, belonging to the technical field of video coding, and mainly being used for solving the problems that the transform domain distributed video coding system has quantization loss and side information prediction precision is low. The system is mainly composed of a coding side, a feedback channel and a decoding side, wherein the coding side is used for independently coding an input video frame and respectively coding pixel domain information and transform domain information formed by dividing a Wyner-Ziv frame; the decoding side is used for jointly decoding a received code flow, updating the side information in the process of decoding the pixel domain information, and decoding the subsequent transform domain information; and the feedback channel is used for providing an information path for the decoding side to request a detection bit from the coding side. The distributed video coding system with combined pixel domain-transform domain lowers the loss on the useful information of the Wyner-Ziv frame, improves the prediction precision on the side information, improves the integral performance and the compression efficiency of the system and can be used for the simple video communication system of encoding equipment.

Description

technical field [0001] The invention belongs to the technical field of video coding, and in particular relates to a distributed video coding system combining pixel domain and transform domain, which is used to reduce the quantization loss existing in the system and improve the prediction accuracy of side information, thereby improving the rate-distortion performance and the performance of the system. Compression efficiency. Background technique [0002] With the rapid development of information technology and the Internet, multimedia has become the most important carrier for people to obtain information, and multimedia communication in a wireless environment will become a new trend. In order to adapt to the increasing development of wireless networks, more and more mobile video terminals are used in multimedia communications, such as low-power video sensors in wireless multimedia sensor networks WMSNs, wireless PC cameras and wireless video surveillance. These devices are u...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/124H04N19/149H04N19/176H04N19/182H04N19/547H04N19/55H04N19/593H04N19/61H04N19/625
Inventor 陈健张涛崔伟阔永红
Owner XIDIAN UNIV
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