Image and video coding and decoding

Abstract

A method of encoding images into a bitstream, the method comprises determining a residual subblock comprising an area of a residual block for a block to be encoded, and encoding transform coefficients of a transform block to be encoded based on the residual subblock area. A corresponding method comprises decoding images from a bitstream. The methods may comprise obtaining a prediction information portion of a block, comprising a plurality of samples for the block and determining the residual subblock based on the prediction samples. The methods may comprise inferring the position of the residual subblock. The process may be an Advanced Subblock Transform (ASBT) process. The method may comprise selectively encoding an orientation of the transform block in the bitstream, and wherein the orientation of the transform block is context-adaptive binary arithmetic coding (CABAC) coded; wherein at least one CABAC context is associated with the orientation of the transform block. [Fig. 14]