Multistage temporal motion compensation for motion vector coding

Motion vector field is generally encoded by using an intraframe differential coding, that is, the well known DPCM approach. An interframe differential coding might be an alternative when the motion vector field is not spatially smooth enough. In this paper, we propose a multistage interframe differential coding approach. In addition to the temporal dependencies between the motion vector fields, temporal dependencies between residual vector fields of consecutive stages are also exploited in this approach. An accumulated average for generating the compensation vector field is also proposed in this paper. Experimental results have shown that the proposed approach is more suitable for real applications where various characteristics of motion fields might exist