Motion Estimation And Motion Compensation Technology Research Based On H.264

H.264/AVC, the new generation standard was made up by the ITU-T and ISO/IEC together. The standard has the unique advantage that supports the transmitting of high quantity video under variety net environments with very low bit rate. But because it adapts some new advanced technology, the complexity of the H.264/AVC encoder is very high, which makes its application limited. To give full play to its advantages, reducing the encoder complexity with good encoding performance and is one of the goals in the field, which is the goal of this paper too. This paper researched the key algorithms of H.264/AVC.Following simple analysis about video compression principle and current video encode standards, H.264/AVC en-decoder is introduced, including encoding framework, character of the current algorithms and the reason for their weakness, this paper proposed some new algorithm as follows:When block matching, it was found that some algorithms can not be accorded with the distribution of motion vector very much because they adopt only one search mask or the shape of the masks, to make the search process more object-oriented and adaptive, this paper identified the block as certain type based on the motion area, and then apply relevant search mask to search fine.In the processing of the selection of macro block partition modes, JM reference software check all the modes and select the best one, so make time consumption too much. While some other algorithms make the selection processing faster by only checking some "sample" modes and because it is coarse, the encoder performance is worse. After discussing the reason for not making a good balance between the encoding performances and encoding complexity, based on the character of video sequences and the relationship between the partition modes, this paper proposed a fast algorithm which based on modes group and early termination. By the upper two optimizations, the new processing gets purposive and simpler.The experiment results showed that, compared with the present standard algorithms, the new algorithm proposed in this paper can save some encode time with almost the same PSNR and bit-rate. So the new algorithm is good for practicality of H.264/AVC standard.