Rate aberration optimizing frame refreshing and code rate distribution method for interested area

Abstract

The invention discloses a probability distortion optimized intra refresh and code rate distribution method for interested regions. Firstly, end-to-end global distortion of video transmission under fallible environment is analyzed according to an end-to-end global distortion theory and comprises information source distortion and channel distortion; secondly, computing formula of the channel distortion is deduced and video coding lagrange cost function formula on the basis of the interested regions is obtained according to a probability distortion theory; thirdly, a weighting forecasting model of complexity of the prior macro block is obtained according to space-time relativity of macro blocks; fourthly, target code rate of the macro block is computed according to the complexity obtained after forecasting of the prior macro block and a region where the macro block is located; fifthly, the steps are repeated until coding of the prior frame is finished. The invention performs intra macro block refresh and code rate distribution according to interested regions to which human eyes pay attention and better subjective video image quality is obtained on a decoding end.

Description

technical field [0001] The invention relates to a rate-distortion-optimized intra-frame refresh and code rate allocation method for an area of ​​interest, belonging to the field of video communication. Background technique [0002] Predictive coding is widely used in video processing technology. When video is transmitted over interference-prone wireless channels, transmission errors spread in time and space domains, resulting in rapid degradation of video quality. Intra-coding update of damaged macroblocks can effectively prevent the error from spreading in the time domain and improve the recovery ability of video errors, but at the cost of reducing the coding efficiency of the source. Therefore, how to reasonably perform intra-frame macroblock brushing to achieve a trade-off between video robustness and coding efficiency has important research significance. [0003] Among the existing intra-frame refresh algorithms, the literature Yuan Zhang, Wen Gao, Yan Lu, Qingming Huan...

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Problems solved by technology

[0003] Among the existing intra-frame refresh algorithms, the literature Yuan Zhang, Wen Gao, Yan Lu, Qingming Huang, and Debin Zhao. Joint Source-Channel Rate-DistortionOptimization for H.264 Video Coding Over Error-Prone Networks, IEEE Trans. Multimedia, Vol.9, No.3, pp: 445-454.Apr.2007. Analysis of the end-to-end distortion estimation method under the lost channel, literature Quqing Chen, Zhibo Chen, Xiaodong Gu, and Charles Wang.Attention-based Adaptive intra refresh for error-prone video transmission, IEEE Communications Magazine, Vol.45, No.1, pp: 52-60.Jan.2007. According to the characteristics that the human eye is interested in some areas of the video image and others are less concerned , proposed intra-macroblock refresh in the region of interest based on the visual characteristics of the human eye, but the increase in intra-frame macroblocks in the region of interest will inevitably increase the bit rate overhead, which will greatly affect the subjective image quality when the bit rate is limited influences

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