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Research on Error Concealment Technology Based on H.264 Decoder

Author: ZhouSheng
Tutor: SunZhiXin
School: Nanjing University of Posts and Telecommunications
Course: Computer Software and Theory
Keywords: Error masking Video Coding H.264
CLC: TN919.81
Type: Master's thesis
Year: 2012
Downloads: 19
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Abstract


With the development of video technology and network communications increasingly broad applications of video playback in the network , the transmission of compressed video via data packets in the network is easy to produce error or packet loss due to interference , reducing the video quality of the receiving end . Error masking interframe intraframe correlation by the decoding side , without increasing the transmission delay and bandwidth pressure to improve the quality of video technology . According to the technical characteristics of error masking , shadowing and airspace of the time domain error can be divided into two types of error masking . And mainstream spatial and temporal error masking algorithm were studied in detail , and I frame error masking algorithm and time-domain error masking algorithm proposed improvement strategies for the strengths and weaknesses of the existing technology , in the analysis ffmpeg project open source H.264 decoder platform the H.264 standard policy on the basis of the H.264 decoder with error masking function . For I-frames of error masking, the video frame of the traditional linear interpolation for the image pixel value changes relatively gentle better shielding effect , but the case of large changes in the intra - frame pixel values ??subjective effect is not satisfactory. For the I frame the error masking strategy the masking algorithm characteristics by combining traditional Airspace error , and combined with a time-domain error masking advantages, use of interframe correlation is proposed according to the video scene change adaptively I frame error masking mode selection algorithm . The algorithm at the decoding side can be provided according to the change of intensity of the video scene adaptive I frame error masking strategy, and performing a macro block matching can be provided according to the state of neighboring macroblock adaptive search strategy . P frame error shelter , taking into account the zero motion vector mask not apply to sport more intense image boundary matching method in the more severe cases of the translational motion of the image content achieved very good results, but not sufficiently precise estimates of non - translational motion , this article improved P frame error masking algorithm , using traditional boundary matching to get the best match macroblock , and then use the arrow matching method in different directions that macroblock secondary boundary match , equivalent to the best reference macroblock The angle rotation arbiter . From the experimental results , the proposed algorithm improve the image of the objective and subjective quality of error masking after .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication > Image coding
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