Patent ID: 11962757
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
determining whether a prediction mode of a current block is an intra prediction mode, based on information on the prediction mode of the current block;
determining whether a transform mode of the current block is a transform skip mode;
determining whether an intra prediction technique of the current block is intra sub-partitions (ISP), based on the prediction mode of the current block being the intra prediction mode; and
generating a transform coefficient block of the current block, based on the transform mode of the current block and whether the intra prediction technique of the current block is ISP,
wherein the generating the transform coefficient block comprises:
splitting the transform coefficient block of the current block into transform subblocks having a predetermined size; and
reconstructing a transform coefficient included in a transform subblock by decoding information on the transform coefficient included in the transform subblock,
wherein the reconstructing the transform coefficient included in the transform subblock is performed based on first information specifying whether a non-zero transform coefficient is included in the transform subblock, and
wherein, based on the transform mode of the current block being the transform skip mode and the intra prediction technique of the current block being the ISP, parsing of the first information is skipped, and the first information is set to specify that the transform subblock includes the non-zero transform coefficient.