Patent ID: 8155459

Claim:
A video processing device for processing data corresponding to a sequence of pictures according to a predictive block-based encoding technique, said device comprising: a processing unit including a reconstruction circuit for reconstructing pictures from decoded data, an external memory for storing reference pictures delivered by the processing unit, the processing unit further comprising: a memory controller for controlling data exchange between the processing unit and the external memory, a cache memory for temporarily storing data corresponding to a prediction area, said data being read out from the external memory via the memory controller, and a motion compensation circuit for delivering motion compensated data to the reconstruction circuit on the basis of the prediction area read out from the cache memory; said device being configured to: divide the data corresponding to the prediction area within the cache memory into zones of equal size; determine a subset of the zones that contain pixels corresponding to an image to be retrieved, and retrieve, during decoding, only the subset from the external memory to the cache memory; wherein bandwidth required to retrieve the image is reduced as a function of a quantity of the zones that are not retrieved based on failure to contain the corresponding pixels.