| 摘要 |
The invention, related to an encoding method applied to a video sequence divided into successive groups of frames (GOFs) themselves subdivided into successive couples of frames (COFs), comprises a motion estimation step applied to each couple of frames (COF), a motion-compensated three-dimensional (3D) subband decomposition step applied to each GOF, using a motion-compensated temporal analysis, based on said motion vector fields, and a spatial wavelet transform for defining a decomposition into spatio-temporal subbands, a coding step, for quantizing and coding said spatio-temporal subbands, and a control step. According to the invention, the direction of the motion estimation step for the successive couples of frames of any concerned GOF is chosen according to a scheme which is preferably either an alternate one, for the successive couples of frames, or an arbitrarily modified scheme in which the motion estimation and compensation operations are concentrated on a limited number of said successive couples of frames, selected on the basis of an energy criterion. |
