Out-of-loop motion compensation for reduced complexity video encoding

Summary form only given. In order to reduce the complexity of a video encoder, we introduce a new approach to global motion compensation related to the conventional hybrid DPCM-transform method in which the motion compensation is performed outside the feedback loop. Within this framework, many specific implementations are possible, some of which are studied. Our method continually tracks and updates the image in the feedback loop in the same way as a conventional hybrid system. Using both residual energy and reconstruction error as metrics, we show that the new motion compensation scheme compares very favorably to the conventional one.