Method and device for coding an image signal with redundancy...

Details Method and device for coding an image signal with redundancy... Method and device for coding an image signal with redundancy...

H - Electricity

04

N

350/33

H04N 7/30 (2006.01) H04N 7/26 (2006.01)

Patent

CA 1246733

Abstract of the Disclosure A method of image signal coding, the image being subdivided into blocks to be coded in sequence, in which a two- dimensional linear transformation is first applied to each of the blocks, obtaining a set of transformation coefficients. The coding is carried out iteratively by coding at each iteration one of the coefficients of the block with an additional bit as compared to the preceding iteration, and evaluating at each iteration the global error value made if the image block is reconstructed starting from the total number of bits up to now given to the block. The iterations relating to a block start from the coding of all its co- efficients with zero bits and terminate when said global error becomes lower than a predetermined threshold error.

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