.h.264/avc Encoder Optimization Design And Implementation

With the rapid growth of mobile communications and Internat,voice and data communication cannot meet people's need any more.The requirement for businesses of digital video and image is increasing enormously.On the other hand,video communications require very much bandwidth in comparison with other information types such as text and data.Thus to adapt with the bandwidth-limited channels,especially wireless channels,video source must be compressed extremely.The most successful class of today's video compression schemes are called hybrid codecs,such as H.263,MPEG-2 etc.Codecs based on H.263 standard or its improved version H.263+ H.263++ have widely been adapted in the system of video telephony and conference.However,these early video compression standards have many drawbacks obviously just because of technology limitations.So those can't afford the satisfied performance for high quality video transportation and low delay given the narrow bandwidth.H.264/AVC is the next generation video coding standard of ITU-T and ISO/IEC.Techniques the new standard uses include integer transform instead of DCT,the deblocking filter to enhance picture subjective quality,more types of block and more accurate motion compensation for inter prediction,more modes for intra prediction,and Context-Adaptive Entropy coding (CAVLC or CABAC) and so on.In terms of coding efficiency,the new standard is expected to provide at least 2x compression improvement over previous standards.This thesis gives an overview of H.264/AVC standard and basic algorithms in every part of encoder.These parts,which have a heavy influence on the performance of the encoder,motion compensaton and mode decision,are discussed and analysed through plenty of experiments.At the same time,the lagrangian algorithm is introduced to optimize the encoder operation so as to increase the rate-distortion performance of it. Finally, an implementation of the encoder should be given including hardware platform and software flow chart,and its test result and conclusion.