Patent ID: 7280600

Claim:
Process for the blockwise coding of digital video images in which to each block is assigned a specified resolution dependent on a zone in which this block is located, an image comprising at least two zones to which different resolutions are assigned, an image being coded by using transformation of blocks from the spatial domain to the frequency domain, characterized in that the mixed blocks straddling two zones of different resolutions are detected, said mixed blocks are constructed by determining the zone corresponding to each pixel of these mixed blocks and by allocating the resolution of this specified zone to this pixel to get constructed mixed blocks and said constructed mixed blocks are transformed in the frequency domain, in that the image is coded via data or coefficients in the frequency domain, and in that to allocate to each pixel of the mixed blocks the resolution which corresponds to its zone, the data of the frequency domain are quantized, dequantized before being used for a retransformation into the spatial domain.