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Quick pre-skip mode determining method in H.264/SVC (H.264/Scalable Video Coding)

A technology of skip mode and determination method, applied in the field of H.264/SVC video coding, can solve the problems of high computational complexity, mode decision taking a long time, etc., to achieve high coding efficiency, little loss of coding quality, and improved coding speed. Effect

Inactive Publication Date: 2014-12-03
CENT SOUTH UNIV
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Problems solved by technology

[0004] In the process of video encoding, mode decision takes a lot of time and has high computational complexity

Method used

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  • Quick pre-skip mode determining method in H.264/SVC (H.264/Scalable Video Coding)
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  • Quick pre-skip mode determining method in H.264/SVC (H.264/Scalable Video Coding)

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[0028] Through a large number of previous experiments, it was found that in SVC, the proportion of skipped modes in the enhancement layer (EL) averaged 59-71%, and for some video sequences with less severe or moderate motion, the proportion was even as high as 70%. This fact shows that the designed fast skip mode judgment method can greatly improve the coding efficiency. In the present invention, a three-dimensional variable Vs (Bskip (Ec), Bskip (El), Bskip (Eu)) is firstly set to respectively represent the skipping conditions of the base layer block, the left module, and the upper module corresponding to the current encoding module . Value is 1 when the module is in skip mode, 0 otherwise. It can be known that if Vs=(1,1,1), the current encoding module is likely to be judged as skip mode. But through our experiments, it is found that when Vs≠(1,1,1), there are still a large number of modules in the enhancement layer that are judged to be skipping modes. Therefore, we coun...

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Abstract

The invention discloses a quick pre-skip mode determining method in H.264 / SVC (H.264 / Scalable Video Coding). By combining RDcost (Rate Distortion cost) comparison and CBP (Coded Block Pattern) checking, the skip mode of a module is predetermined; and the method disclosed by the invention is higher in coding efficiency and smaller in coding quality loss. In order to further increase the coding speed, the method can be further applied to other SVCFMD algorithms and used as an early skipping detection method.

Description

technical field [0001] The invention relates to the field of H.264 / SVC video coding, in particular to a fast pre-skip mode judgment method in H.264 / SVC. Background technique [0002] In recent years, SVC has received more and more attention in the industrial and academic fields. It can provide good quality in the network with limited bandwidth, but its computational complexity is very high compared with non-extended coding, and many fast mode decision algorithms have appeared on this basis. Compared with H.264 single-layer video coding, SVC coding needs to be applied to both base layer and enhancement layer. [0003] SVC adopts inter-layer prediction mode, including inter-layer intra prediction, residual prediction and motion estimation. These added layers and predictive models greatly increase coding complexity. In addition, efficient mode decision-making is also important for the application of SVC in the real-time domain. As the requirements for video technology conti...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/187H04N19/19H04N19/567H04N19/103H04N19/147
Inventor 张昊朱小玉何轩龙军
Owner CENT SOUTH UNIV
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