METHOD AND DEVICE FOR CODING AND DECODING IMAGES

摘要

A coding method includes cutting an image into a plurality of blocks containing symbols. Adjacent pairs of blocks are grouped into a predetermined number of tiles of the image. An entropy coder codes each tile by associating digital information with the symbols of each block of a tile under consideration, Coding includes, for the first block of the image, a substep of initializing state variables of the entropy coder. At least one data substream is generated and representative of at least one of the coded tiles. When the current block of the tile forms a boundary with an adjacent edge of a neighboring tile, the method includes writing in the substream all of the digital information that has been associated with the symbols during the coding, for the tile under consideration, of the blocks preceding the current block, and performing the initialization substep.

主权项

1. A coding method for coding at least one image comprising:
cutting up the image into a plurality of blocks suitable for containing symbols belonging to a predetermined set of symbols; grouping together adjacent pairs of blocks into a predetermined number of partitions of the image that are referred to as tiles, the blocks of a tile under consideration being for coding consecutively; using an entropy coder module to code each of said tiles of blocks by associating digital information with the symbols of each block of a tile under consideration, said coding step including, for the first block of the image, a substep of initializing state variables of said entropy coder module; and generating at least one data substream representative of at least one of said coded tiles of blocks; for at least one tile under consideration of said image, where the current block of said tile is a coded block situated along an edge of said tile forming a boundary with an adjacent edge of a tile neighboring said tile, the method further comprises the following steps: writing in the substream representative of said tile under consideration all of the digital information that has been associated with the symbols during the coding, for said tile under consideration, of the blocks preceding said current block; and performing said initialization substep.