Color video encoding method based on a wavelet decomposition

1. A color video coding method using a 3D-SPIHT algorithm applied in a tri-stimulus color space such as YUV with luminance plane Y and chrominance planes U and V being in the 4:2:0 format, wherein:

a wavelet decomposition of the U and V planes is performed over a number of resolution levels which is a number of resolution levels of the wavelet decomposition of the luminance plane minus one;

the U and V color planes being already in a sub-sampled format which allows to see the full resolution color U or V plane as an approximation of the full resolution luminance plane, the size of said full resolution color U or V plane is the same as the size of the first level approximation in the multiresolution decomposition of the Y plane and the n-th resolution level of the luminance has the same size as the (n−1)-th level of the chrominance;

each pixel (i,j) of the approximation sub-band at the lowest resolution of the Y plane is associated with the pixel at the same location in the corresponding sub-band of the U and V planes.

2. A method according to claim 1 , in which the structure of the initial lists of the coefficients created by decomposing the original color image is simplified in that the initial lists are only initialized with the appropriate coordinates of the top level coefficients from the luminance plane, the chrominance coefficients of the U and V approximation sub-bands thus appearing as offsprings of the luminance coefficients in the root sub-band.

3. A method according to claim 2 , in which the root coefficients from the U and V color planes corresponding to the positions which are not considered for the initialization of the list of insignificant sets are introduced in the list of insignificant pixels at initialization.