12. The video encoding device of claim 10 , characterized in that said flags are placed at the block level.
10. A video encoding device applied to an input sequence of frames in which each frame is subdivided into blocks of arbitrary size, said device applying to at least a part of said blocks of a current frame at an encoding side the following means: means for generating block-confined motion-compensated frames, each one being obtained from each current original frame and a previous reconstructed frame; means for generating from said motion-compensated frames residual signals; means for performing a matching pursuit (MP) algorithm based coding technique for decomposing each of said generated residual signals into coded dictionary functions called atoms, other blocks of the current frame being processed by means of other coding techniques; means for coding said atoms and motion vectors determined during the motion compensation step, for generating an output coded bitstream; said device being further characterized in that, when using said MP algorithm, several dictionaries are available at the encoding side in said video encoding device, and a bitstream syntax is defined for placing at a predetermined level flags provided to indicate which dictionary should be used.