SUB-BLOCK PALETTE MODE

摘要

Video data may comprise one or more blocks, each block being associated with a block palette comprising one or more palette entries specifying pixel values used in the block. A block is further divided into a plurality of sub-blocks. A sub-block scanning order for the block and pixel scanning orders for the sub-blocks are adaptively selected, based upon a distribution of pixel values within the block and sub-blocks. Sub-blocks may be associated with sub-block palettes, specifying pointers to palette entries of the block palette. Some sub-blocks may be encoded based upon pixel values of neighboring sub-blocks.