Patent ID: 6944230

Claim:
Device for the motion-compensated recursive filtering of video images before coding, comprising: means of storage of at least one input image, a blockwise motion estimation module, designed to produce motion vectors (d) blockwise and quantities representative of variations in motion-compensated images (DFD), on the basis of a current input image and of at least one input image stored previously in the said means of storage, means for determining a recursivity noise level (σ rec ) as a function of at least the said quantities representative of variations in motion-compensated images (DFD), a module for calculating a prediction error (ε), between a current input image and an image predicted previously by filtering and motion compensation, a module for calculating a recursivity coefficient (α) as a function of the said recursivity noise level (σ rec ) and of the said prediction error (ε), means for calculating a motion-compensated image on the basis of a filtered image and of the said motion vectors (d), means of filtering, intended to produce a weighting of the current input image and of a filtered and motion-compensated image stored previously, by the recursivity coefficient (α), and means of storage of at least one filtered and motion-compensated image, produced by the means for calculating motion-compensated images, wherein the said filtering device comprises: means for determining an immobility noise level (σ imm ) as a function of at least the said quantities representative of variations in motion-compensated images (DFD), and an assembly for processing zones constituting partitions of the said blocks employed for the motion estimation, comprising: means of calculation in the said zones, of quantities representative of variations in images preserved in space (FD), on the basis of a current input image and of at least one input image stored previously in the said means of storage of input images, and means of zeroing the motion vectors (d) associated with the said zones when the said quantities representative of variations in images preserved in space (FD) are below a threshold dependent on the immobility noise level (σ imm ).