| 摘要 |
The invention relates to a method for encoding a sequence of frames by means of a three-dimensional (3D) subband decomposition involving a filtering step applied to the frames considered as a 3D volume. The decomposition is applied to successive groups of frames after the implementation, on the frames of each group, of motion estimation and compensation operations in the low frequency temporal subbands at each level of the temporal decomposition, the compensation operation leading, among the filtered pixels, to double-connected pixels corresponding in the current frame to regions of the reference frame becoming uncovered during motion. According to the invention, the identification step of double-connected pixels is followed by a decision step based on a minimization criterion and provided for choosing in the current frame, for the temporal filtering of a double-connected pixel of the reference frame, the pixel that leads to a minimum energy of the detail subband. Moreover, when the temporal part of the 3D decomposition is a temporal wavelet transform that includes a temporal filtering based on the lifting scheme, said temporal filtering includes an overlapped motion compensation using in the prediction step of said scheme an average of pixels from adjacent windows in the reference frame.
|
