| Summary: | 碩士 === 國立東華大學 === 電機工程學系 === 93 === H.264 is the latest video coding standard, which developed jointly by the ITU-T Video Coding Experts Group (VCEG) and the ISO/IEC Moving Picture Experts Group (MPEG). The main goals of this standard are to develop advanced video coding design, with enhanced compression performance, and to provide “network-friendly” applications.
To achieve the highest coding efficiency, H.264 adopts complicated coding schemes, employing motion compensation with variable blocks sizes from 16x16 to 4x4, multiple reference frames for temporal prediction, quarter-pel motion vector accuracy, intra coding, deblocking filter and integer transform, etc. Unfortunately, these features incur a considerable increase in encoder complexity, mainly regards to mode decision and motion estimation.
In this thesis, we propose fast algorithms to speed up the motion estimation and mode decision for H.264. The experimental results show that our proposed algorithm can save the coding time about 80% compared with full search in JM94 while keeping the subjective and objective quality.
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