1.15 Mbit/s coding of video signals including global motion compensation

Abstract

A coder for television video signals working at a bit-rate of 1.15 Mbit/s is presented. It uses a special coding structure facilitating trick modes and a separated global and local motion compensation. Global motion is described by a central zoom and pan model. For the estimation of global motion a frame matching algorithm is explained. The advantages of using global motion parameters are given by the reduction of the amount of coded motion information as well as the reduction of regions to be replenished in the predicted pictures. Experimental results show that for the given bit-rate of 1.15 Mbit/s the quantization step size for prediction error coding can be reduced by the factor three in case of existing global motion. Also at the decoder side global motion parameters are used for a synthesis of omitted frames resulting in a higher resolution in time for global motions.