| 摘要 |
The invention generally relates to a three-dimensional (3D) video coding method for the compression of a bitstream corresponding to an original video sequence that has been divided into successive groups of N=2<SUP>n </SUP>frames (GOFs), and, more precisely, to a method comprising the following steps: (a) a spatio-temporal analysis step, leading to a spatio-temporal multiresolution decomposition of the current GOF into low and high frequency temporal subbands and itself comprising a motion estimation sub-step, a motion compensated temporal filtering sub-step, performed on each of the 2<SUP>n-1 </SUP>couples of frames of the current GOF, and a spatial analysis sub-step, performed on the subbands resulting from said temporal filtering sub-step; (b) an encoding step, comprising entropy and arithmetic coding sub-steps. According to the invention, when said temporal filtering sub-step comprises (n-1) levels and the final temporal decomposition level that would have led to a single low-frequency subband is omitted, the spatio-temporal analysis and encoding steps are performed according to the following rules: (a) each current input GOF is splitted into two new GOFs with half the original size; (b) in each of these two new GOFs, a complete spatio-temporal multiresolution decomposition with (n-1) levels is performed down to the last low frequency temporal subband; (c) a modified 3D-SPIHT scanning is applied consecutively and independently on these two new GOFs.
|
