A motion-compensated interframe coding system for an NTSC color television signal has been developed. The output of a local decoder is used in the form of aY/Cseparated signal. Motion vectors are detected using theYsignal, and theYsignal and both baseband components of theCsignal are motion-compensated. The motion-compensated signals are reencoded into an NTSC signal to provide a motion-compensation interframe prediction in the NTSC format. Real-time experimental hardware has been built. The sampling frequency and bit rate of this system are 10.7 MHz and 1.6 bits/ sample, respectively. This value includes all overhead information such as motion vectors and other control information. An assessment has been made of the picture quality of coded/decoded pictures taken from a variety of broadcast television programs. The quality was good for almost all the programs. A subjective test of picture quality was performed under stringent conditigns. The lowest value for the picture quality of the most difficult scenes at 1.6 bits/sample was 3.3 on a five-grade impairment scale.

A motion-compensated prediction system for interframe coding is proposed. An interframe coding system is developed using this prediction method and second-order temporal prediction. Real-time hardware of reasonable circuit size using this coding system for monochrome TV pictures has been constructed. Assessments have been made of the picture quality of coded/decoded pictures from a variety of broadcast television programs. Quality was good for almost all such programs. A subjective test of picture quality was performed under stringent conditions, using some of the most difficult scenes selected in earlier experiments.