Complex-subband transform for subband-based motion estimation/compensation and coding

This paper introduces the complex subband transform (CST) that can be applied for both subband signal decomposition and motion estimation, which are the two major processes in the subband-based image sequence coding. In the experiments, we compare the CST-based subband motion compensation with the conventional block matching motion compensation, and find that the former has i) higher peak signal-to-noise ratio (PSNR) of the reconstructed images and ii) lower prediction error entropy of the motion vectors.