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

Research on H.264 Inter-frame Prediction Algorithm

Author WangZuo
Tutor WangZuo
School Shenyang University of Technology
Course Computer Software and Theory
Keywords H.264 Motion Estimation Mode selection Inter prediction
CLC TN919.81
Type Master's thesis
Year 2011
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H.264 is a highly compressed digital video codec standard , proposed in 2002 by the composition of the ITU-T Video Coding Experts Group and the ISO / IEC Moving Picture Experts Group Joint Video Team (JVT, Joint Video Team) , which is characterized by has a better coding efficiency and network adaptability . H.264 uses including the quarter - pixel precision motion estimation, the tree motion compensation, multiple reference frame mode, integer DCT transform and entropy coding , and deblocking filtering technology so that the coding efficiency is greatly improved , but brings a huge encoding computational complexity , several times to ten times higher than the previous standard . So high computational complexity , which greatly limits the application in the field of real-time video encoding H.264 Therefore, how to reduce the computational complexity of the encoding in quality assurance compression premise degrees become the hotspot of study . H.264 operation amount of interframe prediction section . First , the basic principle of the H.264 standard , the key technology of the H.264 coding standard , such as the analysis . H.264 tree motion compensation features to improve the motion estimation algorithm of the all-zero block judgment , no longer be repeated for all - zero sub-block motion search , reducing the number of points of the motion estimation search , thereby reducing the computational complexity of the encoding . The experiments show that the algorithm is the basic guarantee for the signal-to-noise ratio under the premise to meet the requirements to reduce motion search point . Secondly classic H.264 inter mode selection algorithm research, based on the coded macroblocks analysis mode selection algorithm . Simple clustering analysis using the correlation between the macroblock and the macroblock has already been encoded on the current coded macro - blocks surrounding the motion vector of the macro block , selected according to the analysis of the results after the corresponding coding mode . The experimental results show that the average loss in the signal-to-noise ratio of 0.07dB, bit rate average rose to 1.84% based on the coding time dropped by an average of 20.71% -36.37 % . Then on the the encoded macroblock analysis mode selection algorithm clustering process improvement, instead of a simple clustering algorithm using Mean Shift clustering algorithm , and propose a mode selection algorithm based on Mean Shift clustering analysis , experiments show that in the signal-to-noise than the average loss of 0.05dB , bit rate rose to an average of 1.76% based on the encoding time dropped by an average of 35.07% -38.05 % .

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