Analysis And Algorithm Optimization Of H.264 Codec

At the end of 1980s, ITU-T released the first H.261 video frequencies which has markings to code international standard, In the later decade, software and hardware of computer are developed quickly, at the same time, video coding and picture process algorithm are in - depth study. Because of such trends, ISO/IEC and ITU-T released some video code international standards one after the other, including MPEG-1, MPEG-2, MPEG-4, H.262, H.263 etc. All of them obtain huge success in their own application fields respectively. In the new century, ITU-T and ISO/IEC join hands to release the video coding international standard, namely H.264/AVC. Though based on motion compensated and transfer coding, performance of H.264 moved ahead of other standards because of being adopted many new technologies in details of implementing, The H.264/AVC standard are considered the various applications of transmission networks from now on, and therefore, it attracted concerns of the academic circles and industrial society.The basic coder that the H.264/AVC recommends didn't make the technique detail optimizations of some particular application environments in order to apply to the great majority of applied situation. Thus, the coding couldn't be the best in some particular condition. In addition, H.264/AVC only carried a norm to the decoding which left some space for its optimizations. Based on present condition, this project did a great deal of researches to decrease its calculation complications and raise the efficiency of calculating.Firstly, introduced the researches about video coding Home and abroad and H.264/AVC standard. Based on the disadvantages and problems of coding soft ware, combining the individual traits of model, we optimized the coder in three aspects. The three aspects are forecast in frame, forecast between frames, integral transfer and quantity. A new mode selection algorithm is presented. Coder soft ware is optimized by adopting new searching algorithm. The process of integral transfer and quantity is optimized in structure. The experiment took the JM7.0 software model as the main source, carried on the simulated test, and made a contrast with the image vision quality, coding time and change of PSNR before optimizing and after it.The experiment proved that after the process of adopting new selection algorithm, searching algorithm, integral transfer and quantity, the complication of calculation is decreased greatly. This method advanced the coding efficiency of video compressing. Finally, this paper is presented summarizer and future prospects the H.264/AVC algorithm.