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Compressed sensing coding and decoding method for distributed video coding non-critical frame

A technology of distributed video and encoding and decoding methods, which is applied in the field of distributed video encoding and non-key frame compression sensing encoding and decoding, which can solve the problems of the deviation of the number of distribution measurement values ​​and the increase of the complexity of the encoding end, so as to reduce the complexity and improve the CS Frame reconstruction quality, effect of reducing encoding delay

Inactive Publication Date: 2013-10-09
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Although this scheme can allocate the number of measurement values ​​of each block in the CS frame, the allocation process is carried out at the encoding end, which increases the complexity of the encoding end. Moreover, the sparseness of the CS frame in the next GoP is estimated by using the dictionary of the previous GoP. Large deviations in assigning the number of measured values

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  • Compressed sensing coding and decoding method for distributed video coding non-critical frame
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  • Compressed sensing coding and decoding method for distributed video coding non-critical frame

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Embodiment Construction

[0043] The technical scheme of the invention will be described in detail below in conjunction with the drawings:

[0044] Distributed video coding divides the video sequence to be coded into video groups (referred to as GoP) such as figure 1 As shown, the length of the GoP set in the present invention is 2, the first frame of each GoP is used as a key frame, referred to as K frame, and the subsequent frame is used as a non-key frame, using compressed sensing coding, so it is referred to as CS frame. The key frame in GoP to be encoded is X t , Non-key frame is X t+1 , The key frame in the next GoP is X t+2 , And so on.

[0045] The system sets a set of parameters: the maximum number of blocks for a frame of image is B, the block size is w×w, and 4 thresholds Tm from small to large are set, (m=1,...,4), block measurement Factor α i , I=1,...,B, the total number of measured values ​​allocated to each block of the non-key frame is M, and the number of measured values ​​per block C i ; ...

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Abstract

The invention discloses a compressed sensing coding and decoding method for a distributed video coding non-critical frame. The method can calculate the number of required measured values for compressed sensing of corresponding image blocks in the non-critical frame according to DCT coefficient characteristics for reconstituting image blocks in the non-critical frame. The method can divide the image blocks into different type according to the required measurement number and can choose different coding methods according to the types of the image blocks. The compressed sensing coding and decoding method reduces complexity of compressed sensing coding and decoding of the distributed video coding non-critical frame and improves the quality of reconstitution images of the non-critical frame.

Description

Technical field [0001] The present invention relates to the technical field of distributed video coding and compressed sensing coding, in particular to a distributed video coding non-key frame compressed sensing coding and decoding method. Background technique [0002] Traditional video coding is based on a hybrid coding framework. The coding end fully removes redundant information in the video signal. It is characterized by complex coding and simple decoding, so it is very suitable for encoding video signals once (one) and multiple times (multiple). Decoding applications. However, due to the limitations of some applications, the computing power, memory capacity, power consumption and other resources of the video encoding end are limited, while the decoding end is not restricted, so new requirements are put forward for video encoding: encoding is simple, decoding can be more complicated . The distributed video coding method is proposed based on this demand. [0003] Distributed ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30
Inventor 宋建新冯紫薇
Owner NANJING UNIV OF POSTS & TELECOMM
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