Patent ID: 8559499

Claim:
A video processing device, comprising: an encoder for compressing a video signal in the form of coding data for successive frames of the video signal; a memory interface for storing the coding data in an external memory and retrieving coding data from the external memory; a decoder for converting retrieved coding data into a decompressed signal; and a video processor for processing the decompressed signal, wherein the encoder comprises: a transforming unit for applying a multiscale transform to a frame of the video signal to obtain coefficient blocks; a mapping unit for distributing the coefficients of each block into a plurality of coefficient groups; and a coding data generator for generating coding data including, for at least one of said groups: a common exponent for encoding the coefficients of said group; and respective mantissas for quantizing the coefficients of said group in combination with the common exponent, and wherein the decoder comprises: an extraction unit for extracting the coding data for at least one coefficient group selected among the groups of a coefficient block; a computation unit for combining the mantissas forming part of the coding data for each selected group and the exponent forming part of the coding data for said selected group to obtain approximated values of the coefficients of said selected group; an assembling unit for assembling at least partially said coefficient block using the approximated coefficient values; and a transforming unit for applying an inverse multiscale transform to the assembled coefficient block; wherein the device further comprises a line buffer for storing coding data transferred from the external memory for a plurality of regions of a frame spanning a stripe of lines of said frame; and a context buffer for storing the decompressed signal in a context portion of said frame, the context portion being included in said stripe of lines and offset according to a pixel location addressed by the video processor; wherein the video processor is arranged to read the decompressed signal from the context buffer.