Research On Motion Compensation Algorithm And Sprite Coding Of MPEG-4

Efficient video compression techniques are very important to the save and transmission of the increasing data in video processes. Recent years, MPEG-4, the lastest video compression standard has lead the research in related fields.This paper research the MPEG-4 standard first and realize the encoder and decoder of video of MPEG-4.Then the paper emphasize two key techniques in MPEG-4 encoder: Motion Estimation and Sprite encode.Motion Estimation takes the largest time in all parts of MPEG-4 encoder.The paper concluded some typical ME techniques, research and realize the MVFAST arithmetic whice is recommend by ISO,then improved MVFAST by considering the temporal candidate motion vector and adjustal thresholds.Sprite encode is a new idea which is based on encoding accroding to object, the prominent feature of MPEG-4.The paper research the technique of sprite encode,and improved the exiting technique from three aspeces:global motion estimation,selection of computing point and overlap arithmetic.As a part of work, the paper do some research in performance test of VDR(Voyage Data Recoder).We establish the standard of China VDR performance test and pass the authentication of China Classification Society .The test result is satisified after testing all Chinese VDR practically.