An overlapped block motion compensation for high quality motion picture coding

Abstract

An overlapped block motion compensation scheme, which is especially suitable for hybrid coding schemes combine with overlapped transforms, is described. Motion compensation is achieved using enlarged and overlapped blocks. When motion estimation is executed, a window function operates on the prediction error signals. The power of the resulting signal is calculated and used for motion vector evaluation. When motion-compensated prediction is executed, the same window function operates on the prediction signals. The total prediction signal is generated by summing up all the block signals obtained. With this scheme, prediction signals without blocking edges are obtained. The mean square error (MSE) of the prediction error signal is reduced about 19%, and FFT analysis results show that the coefficient power in the frequency domain is concentrated in the lower frequency part. This indicates higher coding efficiency for the overlapped transforms, and for conventional block based transforms as well.