Palette predictor initializer when encoding or decoding self-contained coding structures

摘要

The present invention relates to a method and apparatus for processing images, and for a method and device for encoding or decoding images into or from a bitstream using a palette prediction mode, for example as defined in HEVC SCC. It is about. The image is divided into a hierarchical coding structure. At the decoder, the method uses the same palette level using the palette coding mode using an association palette that includes, for each processed block of the two coding structures, entries that associate each entry index with corresponding pixel values. Decoding encoded data of two self-sufficient coding structures with-the palette associated with each processed pixel block is predicted from the palette predictor using prediction information from the bitstream; Obtaining, from a bitstream, a palette predictor initializer associated with a coding structure hierarchically over two self-contained coding structures; And initializing the palette predictor for each self-contained coding structure using the obtained same palette predictor initializer.