Background-frame based motion compensation for video compression

This paper presents a new kind of reference frame, i.e., the "background frame", to improve the accuracy of motion compensation in video compression. When an object moves in the scene of a video sequence, a certain part of the background is overlapped at first. After several frames, it begins to reappear. In the frames the background reappears, the blocks contained in the background part may be poorly predicted by neighboring blocks which have been overlapped in the previous frames. To solve this problem, the "background frame" is constructed, based on blocks that have kept unchanged in a certain number of continuous frames. The background frame is free from the influence of moving objects. So, when it is used as a reference jointly with the traditional previous frame, better prediction would be obtained. The experimental results show that the background frame based motion compensation (BFMC) algorithm can obtain increased coding efficiency compared to the JVT/AVC/H.264 standard with one reference frame or two reference frames