Patent ID: 11924422
Assignee: BYTEDANCE INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
determine, for a conversion between a current video block within a picture of a video and a bitstream of the video, whether a partitioning mode is used for the current video block,
partition, in case that the partitioning mode is used for the current video block, the current video block into multiple sub-regions; and
perform the conversion based on the multiple sub-regions,
wherein the multiple sub-regions share a same intra prediction mode, and the multiple sub-regions include a first sub-region having a same top-left corner position as that of the current video block,
wherein in case that the partitioning mode is used for the current video block, different syntax elements are conditionally included in the bitstream for different sub-regions respectively,
wherein each of the different syntax elements indicates an absolute value of a difference between a quantization parameter of a corresponding sub-region and a prediction of the quantization parameter,
wherein in case that the partitioning mode is used for the current video block and the current video block is a luma transform block, a variable indicating a ratio of a width to a height is derived based on a width of the luma transform block and a height of the luma transform block,
wherein in case that the partitioning mode is not used for the current video block, the current video block is the luma transform block, and the width of the luma transform block is no greater than maxTbWidth or the height of the luma transform block is no greater than maxTbHeight, the variable is derived based on the width of the luma transform block and the height of the luma transform block,
wherein the variable is used to derive an intra prediction mode in a wide-angle intra prediction mode mapping process for each of the multiple sub-regions,
wherein a wide-angle intra prediction mode is a mode in which a reference sample and a sample to be predicted form an obtuse angle with respect to a top-left direction,
wherein in case that the partitioning mode is used for the current video block and the current video block is the luma transform block, whether the wide-angle intra prediction mode for the multiple sub-regions is enabled is based on a value derived from a maximum number of a width of each sub-region and 4.