Adaptive frame/field motion compensated video coding

摘要

The second phase of the Motion Pictures Experts Group (MPEG-2) activity is in progress and is primarily aimed at coding of high resolution video with high quality at bit-rates of 4 to 9 Mbit/s. In addition, this phase is also required to address many issues including forward and backward compatibility with the first phase (MPEG-1) standard. For MPEG-2, an adaptive frame/field motion-compensated video coding scheme is proposed. This scheme builds on the proven framework of DCT and motion-compensation based techniques already optimized in MPEG-1 for coding of lower resolution video at low bit-rates. Various adaptations include techniques to improve efficiency of coding for interlaced video source as well as improving quality by better exploitation of characteristics of the video scenes. Statistics and subjective tests confirm that these adaptations provide significant improvement as compared to purely MPEG-1 based coding. We then discuss issues of compatibility with the MPEG-1 standard and of implementation complexity of the proposed scheme.