METHOD AND DEVICE FOR STORING A COMPRESSION RATIO INDICATION IN A PIXEL VALUE BUFFER IN TILE ENCODING

摘要

A tile of pixels is encoded by variable length encoding blocks of pixels constituting different subsets of the tile to form sequences of symbols as encoded representations of the pixel values. A respective size indication is determined for each set of at least block. A size indication is representative of a compression ratio of a combined sequence corresponding to the at least one sequence of symbols obtained for the at least one block of the set. The combined sequences are arranged in in a pixel value buffer in a buffer memory. The size indication determined for a given set is also stored in the pixel value buffer in the buffer memory to precede, according to a reading order of the pixel value buffer, the combined sequence of the given set.

主权项

1. A method of encoding a tile of pixels each having a respective pixel value, said method comprising:
variable length encoding multiple blocks of pixels constituting respective subsets of said tile to form multiple sequences of symbols as encoded representations of pixel values of said pixels in said multiple blocks; determining, for each set of at least one block of said multiple blocks, a size indication representative of a compression ratio of a combined sequence corresponding to the at least one sequence of symbols obtained by variable length encoding said at least one block of said set; arranging said combined sequences in a pixel value buffer in a buffer memory; and arranging, for each set, a size indication determined for said set to precede, according to a reading order of said pixel value buffer, said combined sequence in said pixel value buffer in said buffer memory.