ABSTRACT
This chapter describes the motion estimation/motion compensation process as always proceeding from one frame to the next in sequential order. It introduces the idea of motion vectors sent through a side channel to help steer the prediction of the decoder, thereby improving the accuracy of the decoder's motion prediction and requiring less frame difference data to be sent. The concepts interoperability, scalability, and extensibility have become significant causes for some parties to the debate over what the Advanced Television (ATV) standards should be. Interoperability is defined as the sharing of images and equipment across application and industry boundaries. Each frame of a digital television image is broken down into a large number of small image samples called picture elements — pixels or pels, for short. MPEG-style processing serves as the basis for one High Definition Television (HDTV) and a number of 525-line compression systems, several of which are listed.
