MOTION-COMPENSATED SPATIO-TEMPORAL WAVELET COMPRESSION OF VIDEO DATA WITH OPTIMISED PERMUTATION OF THE FRAMES

摘要

In video encoding, the video frames are spatio-temporally filtered for reduction of spatial and temporal redundancy before they are entropy encoded. Known filtering schemes consider temporally successive frames and are static. It is probable but not necessary that successive frames are most efficient to encode. Therefore, a plurality or all possible frame order permutations are considered for a group of frames (GOP) and evaluated based on a global criterion, which is the sum of local criterion values computed over disjoint sets of successive frames considered in the new order. The local criterion value is deduced from motion estimation processed on each considered set of frames. The best ordering is chosen as the one that minimizes the global criterion value.