SCALABLE MPEG-2 VIDEO DECODER WITH SELECTIVE MOTION COMPENSATION

摘要

A decoder system having a motion compensation system that scales the processing of B pictures in order to save computational resources. The motion compensation system has a first scaling system that comprises: a system for comparing a motion vector magnitude of each macroblock in a B picture with a predetermined threshold; a system for performing a routine decoding operation for each macroblock in which the motion vector magnitude is greater than the predetermined threshold; and a system for copying a corresponding macroblock from a previous picture for each macroblock in which the motion vector magnitude is less than or equal to the predetermined threshold. The motion compensation system has a second scaling system that comprises: a system for calculating an average motion vector magnitude for a first B picture; and a system for replacing a next contiguous B picture with the first B picture if the average motion vector magnitude is less than or equal to a predetermined threshold. The second scaling system may also comprise: a system for calculating an average motion vector magnitude for a reference picture; and a system for replacing a B picture with the reference picture if the average motion vector magnitude is less than or equal to a predetermined threshold.