Block matching-based motion compensation with arbitrary accuracy using adaptive interpolation filters
Ichiro Matsuda, Kazuharu Yanagihara, Shinichi Nagashima, Susumu Itoh · 2006
This paper proposes a motion-compensated prediction method which can compensate precise motions using adap-tive interpolation filters. In this method, plural number of non-separable 2D interpolation filters are optimized for each frame, and an appropriate combination of one of the filters and a motion vector with integer-pel accuracy is determined block-by-block. To reduce the amount of side information, coefficients of each filter are downloaded to a decoder only when the filter turns out to be effective in terms of a rate-distortion sense, or else the old filter applied to the previ-ous frame is reused. Simulation results indicate that the pro-posed method provides coding gain of up to 3.0 dB in PSNR compared to the conventional motion-compensated predic-tion method using motion vectors with 1/2-pel accuracy. 1.