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Wyner-Ziv video coding system controlled on the basis of non feedback speed rate and method

A rate control and video coding technology, applied in the field of video coding, can solve the problems of increasing decoding complexity and delay, unfavorable real-time video transmission, and application environment limitation of distributed video coding system, so as to reduce decoding delay and adapt to channels. Changes in bandwidth, the effect of reducing the complexity of the decoder

Inactive Publication Date: 2010-09-15
XIDIAN UNIV
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Problems solved by technology

[0005] Most of the existing distributed video coding systems adopt the code rate control method with feedback channel. The coded check digits are sent multiple times according to the feedback request from the decoding side until the decoding is successful, which can improve the performance to a certain extent. Coding efficiency, but greatly increases the complexity and delay of decoding, which is not conducive to real-time video transmission, and the use of feedback channels also limits the application environment of distributed video coding systems; in addition, the existing code rate control method with feedback Simply setting the quantization factor of the key frame and the quantization matrix of the Wyner-Ziv frame on the encoding side cannot effectively control the rate in the bandwidth-constrained channel

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Embodiment Construction

[0041] refer to figure 1 , the present invention is based on the Wyner-Ziv video coding system without feedback rate control, which consists of three parts: encoder, feedback rate controller and decoder. in:

[0042]Encoder: 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. The encoder is mainly composed of four units of H.264 / AVC intra-frame encoder, transformation, quantization and LDPC encoding. The H.264 / AVC intra-frame encoder is used to intra-frame encode key frames, transform, quantize and LDPC Encoding The three units encode Wyner-Ziv frames independently.

[0043] Feedback-free rate controller: used to allocate the picture group layer rate according to the target code rate, use the inter-frame correlation of the encoded image to allocate the encoding rate of key frames and Wyner-Ziv frames, and perform feedback-free bit-plane en...

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Abstract

The invention discloses a Wyner-Ziv video coding system controlled on the basis of a non feedback speed rate and a method, belonging to the field of a distributing type video coding technology, and mainly overcoming the defect that the existing distributing type video coding method needs a feedback information channel, has large time delay when decoding and can not accommodate the change of the bandwidth of the information channel. The system consists of a coder, a non feedback speed rate controller and a decoder. The coder is used for independently coding an inputted video frame; the non feedback speed rate controller is used for distributing an image group layer code rate according to a target code rate, distributing a frame layer code rate with the correlation among coding image frames, and controlling the speed rate of the Wyner-Ziv frame by means of non feed back bit plane; and the decoder is used for jointly decoding a received code stream. The invention reduces the complexity and the decoding time delay of the decoder, can effectively control the outputted code rate according to the target code rate, and can be used for a video communication system with simple terminal coding equipment.

Description

technical field [0001] The invention belongs to the technical field of video coding, relates to a distributed video coding system and a non-feedback coding rate control method, and can be used in a practical distributed video coding system and a video communication system with simple terminal coding equipment. 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 services will be the key services of wireless broadband networks in the future. According to statistics, 80% of data traffic on broadband networks in the future will be video-based multimedia data traffic. In order to adapt to the increasing development of wireless networks, more and more mobile video terminals are used in multimedia communications, such as wireless video probes, portable cameras, etc., and video sensors are widely used in sensor networks. These encoding d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/146H04N19/61
Inventor 宋彬贺红秦浩杨明明刘海华
Owner XIDIAN UNIV
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