Lossless video coding using multi-frame MC and 3D bi-prediction optimized for each frame

This paper proposes an efficient lossless video coding scheme based on forward-only 3D bi-prediction. In this scheme, a video signal at each pel is predicted using not only the current frame but also two motion-compensated reference frames. Since both the reference frames are taken from the past, coding process of successive frames can be performed in temporal order without extra coding delay. The resulting prediction errors are encoded using context-adaptive arithmetic coding. Several coding parameters, such as prediction coefficients and motion vectors, are iteratively optimized for each frame so that an overall coding rate required for the frame can be a minimum. Experimental results indicate that coding rates of the proposed scheme are 14-21 % lower than those of the H.264/AVC-based lossless coding scheme.