Patent ID: 6907075
Filing Date: 2005-06-14
Classification: H04N

Abstract:
1. An encoding method for the compression of a video sequence divided into groups of frames and decomposed by means of a three-dimensional (3D) wavelet transform leading to a given number of successive resolution levels that correspond to the decomposition levels of said transform, said method being based on a hierarchical subband encoding process leading from the original set of picture elements (pixels) of each group of frames to transform coefficients constituting a hierarchical pyramid, a spatio-temporal orientation tree—in which the roots are formed with the pixels of the approximation subband resulting from the 3D wavelet transform and the offspring of each of these pixels is formed with the pixels of the higher subbands corresponding to the image volume defined by these root pixels—defining the spatio-temporal relationship inside said hierarchical pyramid, the subbands to be encoded being scanned one after the other in an order that respects the parent-offspring dependencies formed in said tree and preserves the initial subband structure of the 3D wavelet transform, said method being further characterized in that, in view of a temporal scalability, a motion estimation is performed at each temporal resolution level, the beginning of which is indicated by flags inserted into the bitstream, and only the estimated motion vectors necessary to reconstruct any given temporal resolution level are encoded and put in the bitstream together with the bits encoding the wavelet coefficients at this given temporal level, said motion vectors being inserted into said bitstream before encoding texture coefficients at the same temporal level.