Coding and decoding images using probability data

摘要

A method of coding at least one image comprising the steps of splitting the image into a plurality of blocks, of grouping said blocks into a predetermined number of subsets of blocks, of coding each of said subsets of blocks in parallel, the blocks of a subset considered being coded according to a predetermined sequential order of traversal. The coding step comprises, for a current block of a subset considered, the sub-step of predictive coding of said current block with respect to at least one previously coded and decoded block, and the sub-step of entropy coding of said current block on the basis of at least one probability of appearance of a symbol.

主权项

1. A method of coding at least one image, the method comprising:
cutting the at least one image into a plurality of blocks; grouping the plurality of blocks into a predetermined number of groups of blocks; and coding each of the groups of blocks, comprising:
for a first block of a given group of blocks:
transforming the first block;determining that the first block is first in an order of blocks in the given group of blocks; andin response to determining that the first block is first in the order of blocks in the given group of blocks, entropy coding the first block based on a first set of probability data, wherein the first set of probability data comprises a first set of probabilities of occurrence of symbols associated with a block that is situated immediately adjacent to the first block and that belongs to another group of blocks that is different from the given group of blocks in the predetermined plurality of groups of blocks;for a second block of the given group of blocks:
transforming the second block;determining that the second block is not first in the order of blocks in the given group of blocks; andin response to determining that the second block is not first in the order of blocks in the given group of blocks, entropy coding the second block based on a second set of probability data, wherein the second set of probability data comprises a second set of probabilities of occurrence of symbols associated with at least one other already coded block belonging to the given group of blocks in the predetermined plurality of groups of blocks, wherein the second set of probabilities of occurrence of symbols are not associated with blocks that do not belong to the given subset of blocks.