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Quality gradable fast coding method based on compressed sensing

A compressed sensing and fast coding technology, which is applied in the field of video coding and can solve problems such as the delay problem that is not well solved and the reduction of coding time.

Active Publication Date: 2018-08-31
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Although the above two methods use compressed sensing to achieve the purpose of reducing the coding complexity, they do not solve the delay problem caused by multi-layer coding and compressed sensing reconstruction, so the overall coding time is reduced again. Space

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  • Quality gradable fast coding method based on compressed sensing
  • Quality gradable fast coding method based on compressed sensing
  • Quality gradable fast coding method based on compressed sensing

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] Scalable video coding is divided into time-scalable, space-scalable and quality-scalable. Such as figure 1 As shown in , this block diagram is a scalable coding situation of a base layer and an enhancement layer. It should be pointed out here that the enhancement layer can have multiple layers. From figure 1 It can be seen that, except for the inter-layer prediction technology between the base layer and the enhancement layer, the base layer and the enhancement layer are two independent video codec processes. Since the video sequences of the base layer and the enhancement layer of scalable video coding are the same video, only the resolution, frame rate, or quality are different or the same. For quality scalability, the video resolutions of the base layer and the enhancement layer are the same , Different quantization steps are used in the base layer and enhan...

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Abstract

The invention discloses a quality gradable fast coding method based on compressed sensing belonging to the video coding technology field. According to the method, sparsity of a compressed sensing theory is adopted to carry out sparse representation of a sub-block having a residual block with a size of 8*8 during coding of a quality gradable enhanced layer, and during the coding, zero supplementingoperation is carried out in order to satisfy a standard coding structure, and then entropy coding can be carried out. Interlayer correlation between a basic layer and the enhanced layer is adopted toselect a sub-block coding mode quickly to further reduce calculation complexity of a coding algorithm. Compared with the prior art, the method provided by the invention is advantageous in that undera precondition of guaranteeing quality of images after the coding, a code rate of a coding end can be effectively reduced, and coding efficiency of a coder can be improved.

Description

technical field [0001] The invention relates to a quality scalable fast coding method based on compressed sensing, which belongs to the technical field of video coding. Background technique [0002] In many practical video compression transmission applications, due to factors such as network heterogeneity, different user requirements, different terminal capabilities, and different Qos (Quality of Service) that channels can provide, it is necessary to provide users with different qualities and different rates. video image signal. One of the best ways to solve this kind of problem is to use scalable video coding, so that a single encoder can generate multiple levels of compressed code streams, and decode different levels of code streams to obtain video image signals of different quality . However, in scalable video coding, the problems of coding complexity and sharp increase of code rate caused by fine quantization of one or even multiple enhancement layers have not been wel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/103H04N19/124H04N19/176H04N19/42H04N19/70H04N19/91
CPCH04N19/103H04N19/124H04N19/176H04N19/42H04N19/70H04N19/91H04N19/132H04N19/159H04N19/187H04N19/36H04N19/46
Inventor 胡栋丁健宇何永洋
Owner NANJING UNIV OF POSTS & TELECOMM
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