ABSTRACT
In exploration of compression, this chapter starts with the methods that reduce redundancy. The chapter also begins with a multi-part examination of digital image compression and focuses on many aspects of compression. It shows the published characteristics of the compressed digital video systems proposed for High Definition Television (HDTV). Television images generally are full of redundancy. This can be seen by thinking of a television image of a painting. The method for redundancy reduction used by many compression systems is predictive motion estimation combined with motion compensation. In predictive motion estimation at its most basic level, the preceding frame is stored in frame stores in both the encoder and the decoder. The motion vectors that are generated as part of the motion estimation/motion compensation process must be sent along with all the other data from the encoder to the decoder. Motion compensation provides additional feature for digital systems.
