Method and apparatus for encoding or decoding blocks of pixel

摘要

A device and method for processing a current block of pixels of an image using a palette coding mode that uses a current palette comprising a set of entries associating respective entry indexes with corresponding pixel values, characterised in that the current palette is predicted from entries of two or more palettes which have been previously used to process blocks of pixels. A palette predictor may be used that is built from the two or more palettes, preferably from the last used palette for a coding unit in the current coding entity and from the previously used palette for which a flag bitmap indicates whether or not its elements have been copied into the last used palette. A palette prediction mode according to High Efficiency Video Coding Range Extension (HEVC RExt) is used with reduced signalling costs as less information about the palette is transmitted from the encoder to the decoder.