Adaptive overlapping approach for DCT-based motion estimation
The feedback loop for temporal prediction of traditional implementations of an MPEG-compliant video coder requires conversion of images from the spatial domain to the transform domain and then back to the spatial domain due to the restriction of motion estimation schemes performed only in the spatial domain, severely limiting the throughput of the coder. However, the availability of the low-complexity DCT-based motion estimation scheme (DXT-ME) that we proposed in the past can remove this bottleneck and concurrently reduce the complexity of the overall coder structure. We adopt an adaptive overlapping approach to further improve this DCT-based motion estimation scheme, as demonstrated in the simulation results. Furthermore, the analysis of stability of DXT-ME is presented and the case of a uniformly bright environment is also discussed. Finally, the parallel architecture of DXT-ME is outlined.