DCT-based subpixel motion compensation and fully DCT-based video coder

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, it was shown that the low-complexity DCT-based motion estimation scheme (DXT-ME) can remove this bottleneck and thus reduce the overall coder complexity. In this paper, we develop efficient DCT-based motion compensation algorithms to complete the fully DCT-based motion compensated video coder. We demonstrate that the performance of this new coder structure is comparable to the conventional one while the overall coder complexity is lower