Patent ID: 11962803
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A non-transitory computer-readable recording medium storing a bitstream which is received and decoded by an image decoding apparatus and used to reconstruct an image,
wherein the bitstream comprises information on an intra prediction mode of a current block and information on a residual block of the current block;
the information on an intra prediction mode of the current block is used to generate an intra prediction mode of the current block;
the intra prediction mode of the current block is used to determine that multi-sample prediction is applied to the current block, the current block being a prediction unit to which the intra prediction mode is applied;
wherein a representative prediction value for a sample group is determined, the sample group being a region inside the current block, being smaller than the current block, and being predicted as the same representative prediction value;
the determined representative prediction value is used to predict a plurality of samples included in the sample group and to generate a prediction block of the current block;
the information on the residual block of the current block comprises information on a transform coefficient for a residual block of the current block which is used to generate the residual block of the current block;
wherein the representative prediction value is determined as an average value of a plurality of reference samples,
wherein other samples inside the current block which are not included in the sample group are predicted differently from the plurality of samples included in the sample group, and
wherein the multi-sample prediction is performed based on a determination of whether the size of the current block is less than 32×32.