Encoding and decoding an image or image sequence divided into pixel blocks

摘要

A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value.

主权项

1. A coding method comprising:
coding, by a coding device, at least one image of a sequence of images, including grouping pixels of the at least one image into a plurality of blocks and generating a data stream that includes data representative of said blocks, wherein coding comprises: grouping at least some of the plurality of blocks in a cluster of blocks according to proximity of their respective values of movement parameter to be coded; determining a movement value characteristic of said cluster of blocks as a function of a respective value of at least one movement parameter to be coded of at least one block of said cluster of blocks; coding each of the blocks of said cluster, where the values of movement parameter of said blocks are coded implicitly by inheritance of said characteristic value or are coded as refinements relative to said characteristic value; and coding a data structure associated with said cluster of blocks, said data structure including data associated with said characteristic value.