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Partial reconstruction-based quality optimization method for scalable video coding

A technology of video coding and optimization method, applied in the field of video coding, can solve problems such as video quality degradation, achieve the effect of improving quality, overcoming video quality degradation, and realizing joint optimization

Active Publication Date: 2012-05-09
ZHEJIANG UNIV
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Problems solved by technology

[0005] The present invention provides a scalable video coding quality optimization method based on partial reconstruction, by selectively truncating transformation coefficients in the coding process, realizing joint optimization of video quality at different target bit rates, and overcoming traditional code stream extraction The video quality degradation problem caused by the method

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  • Partial reconstruction-based quality optimization method for scalable video coding
  • Partial reconstruction-based quality optimization method for scalable video coding
  • Partial reconstruction-based quality optimization method for scalable video coding

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Embodiment Construction

[0017] In order to describe the present invention more specifically, the scalable video coding quality optimization method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Such as figure 1 Shown: a method for optimizing the quality of scalable video coding based on partial reconstruction, including the following steps:

[0019] (1) Set the truncation degree and layer weight.

[0020] The parameters that affect the coding effect include the degree of truncation of the residual transformation coefficient and the layer weight, specifically:

[0021] 1. The degree of truncation of residual transform coefficients: denote the number of untruncated (remaining) residual transform coefficients in the 4×4 residual transform coefficient block on the enhancement layer as ρ, that is, the degree of truncation of residual transform coefficients, then ρ satisfies: ρ∈N (natural number), and ...

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Abstract

The invention discloses a partial reconstruction-based quality optimization method for scalable video coding. The method comprises the following steps of: setting a truncation degree and a layer weight; performing partial reconstruction or entropy coding on a residual error conversion coefficient; calculating macro block distortion of a base layer and an enhancement layer; selecting an optimal mode for determining base layer macro blocks; traversing all macro blocks in a coding frame on the base layer so as to obtain the code stream of the base layer; selecting an optimal mode for determiningenhancement layer macro blocks; traversing all macro blocks in a coding frame on the enhancement layer so as to obtain the code stream of the enhancement layer; and calculating and storing error diffusion distortion and error diffusion sensitivity. In the method, the residual error conversion coefficient is selectively truncated in a coding process, so that combined optimization of video quality at different target code rates is realized, and the problem of video quality reduction caused by the conventional code stream extraction method is solved; and simultaneously, an improved code stream extraction algorithm is used in a combined way, so that video quality is further enhanced.

Description

technical field [0001] The invention belongs to the technical field of video coding, in particular to a method for optimizing the quality of scalable video coding based on partial reconstruction. Background technique [0002] With the rapid development of network technology and video coding (compression) technology, people's demand for video information through the network is increasingly strong, from videophone, video conferencing, to mobile TV, high-definition TV broadcasting, etc. all aspects of work. In the network-oriented video application environment, the goal of video coding is no longer limited to simply pursuing high compression efficiency, but to make video streams (code streams) better adapt to heterogeneous network environments and various user terminals. The heterogeneity of the network is reflected in the differences in network bandwidth and delay, and the diversity of terminals is reflected in the differences in the processing capabilities and display capabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/61
Inventor 陈耀武黄爱爱马汉杰
Owner ZHEJIANG UNIV
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