Choosing a Use Case-Based Context Model for Hybrid Video Coding Tools

摘要

An apparatus comprising an encoder is described. An encoder receives image or video data, encodes the received image or video data, and provides a bitstream representing the image or video data. The encoder includes a CABAC encoder. The CABAC encoder receives a binary-valued syntax element associated with the block of image or video data to be encoded, and, using the selected context model, encodes the binary-valued syntax element into a coded bit for a chant bitstream. The binary value syntax element includes a tool flag indicating whether a particular coding tool, such as a linearly weighted intra prediction LWIP, is used when encoding the block of image or video data. For a block of image or video data having an aspect ratio greater than 2 and to which a particular coding tool is applicable, a first context model for encoding the tool flag is selected from the group of one or more first context models, wherein the aspect ratio is 2 or less; For the block of image or video data to which the particular coding tool is applicable, a second context model for encoding the tool flag is selected from the group of one or more second context models.