Patent ID: 11968367
Assignee: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. The non-transitory computer-readable storage medium of claim 15,
wherein the current video region is a current video block, and whether the first index is included in the bitstream is based on a relationship between at least one of a width (W) and a height (H) of the current video block and an allowed maximum transform size (T);
wherein a location of a last non-zero coefficient in a residual of the current video block is determined based on at least one syntax element in the bitstream, and whether or how to include the first index present in the bitstream is based on a location of the last non-zero coefficient;
wherein the first index is not included in the bitstream in a case that the last non-zero coefficient is not located in a region of the current video block to which that the secondary transform tool is applied;
wherein in response to the first index indicating the secondary transform tool being enabled, a second index indicating an applicability of the forward primary transform or the inverse primary transform and a kernel information of the forward primary transform or the inverse primary transform is not present in the bitstream and inferred to be not applied to the current video region; and
wherein the secondary transform tool corresponds to a low frequency non-separable transform (LFNST) tool.