Block form-based prediction method and device
Disclosed herein are a video decoding method and apparatus and a video encoding method and apparatus. In video encoding and decoding, multiple partition blocks are generated by splitting a target block. A prediction mode is derived for at least a part of the multiple partition blocks, among the multiple partition blocks, and prediction is performed on the multiple partition blocks based on the derived prediction mode. When prediction is performed on the partition blocks, information related to the target block may be used, and information related to an additional partition block, which is predicted prior to the partition block, may be used.
1 . A video decoding method, comprising:
determining a first intra prediction mode for a target block in a case that a first indicator indicates that intra prediction is used for the target block; and
generating a prediction block by performing the intra prediction for the target block using the first intra prediction mode,
wherein the intra prediction for the target block is performed using at least one second intra prediction mode in a case that a second indicator indicates that the at least one second intra prediction mode is used for the intra prediction for the target block, and
wherein an intra prediction mode in a list comprising one or more third intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and a third indicator indicates that the list is used for the intra prediction for the target block.
2 . A video encoding method, comprising:
determining a first intra prediction mode for a target block; and
generating a prediction block by performing intra prediction for the target block using the first intra prediction mode,
wherein a bitstream comprising a first indicator is generated,
wherein the first indicator indicates whether the intra prediction is used for the target block,
wherein the intra prediction for the target block is performed using at least one second intra prediction mode in a case that a second indicator indicates that the at least one second intra prediction mode is used for the intra prediction for the target block, and
wherein an intra prediction mode in a list comprising one or more third intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and a third indicator indicates that the list is used for the intra prediction for the target block.
3 . A non-transitory computer-readable medium storing the bitstream generated by the video encoding method of claim 2 .
4 . A non-transitory computer-readable recording medium for storing a bitstream, the bitstream generated by a video encoding method to generate the non-transitory computer-readable recording medium, the video encoding method comprising:
determining a first intra prediction mode for a target block;
generating a prediction block by performing intra prediction for the target block using the first intra prediction mode; and
storing the bitstream comprising a first indicator in the non-transitory computer-readable recording medium,
wherein the first indicator indicates whether the intra prediction is used for the target block,
wherein a first intra prediction mode for a target block is determined in a case that the first indicator indicates that intra prediction is used for the target block,
wherein a prediction block is generated by performing the intra prediction for the target block using the first intra prediction mode,
wherein the intra prediction for the target block is performed using at least one second intra prediction mode in a case that a second indicator indicates that the at least one second intra prediction mode is used for the intra prediction for the target block, and
wherein an intra prediction mode in a list comprising one or more third intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and a third indicator indicates that the list is used for the intra prediction for the target block.
5 . The video decoding method of claim 1 ,
wherein the at least one second intra prediction mode is not comprised in the list.
6 . The video decoding method of claim 1 ,
wherein an intra prediction mode of one or more fourth intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and the third indicator indicates that the list is not used for the intra prediction for the target block.
7 . The video decoding method of claim 6 ,
wherein the one or more fourth intra prediction modes don't include any one of the at least one second intra prediction mode and the one or more third intra prediction modes.
8 . The video encoding method of claim 2 ,
wherein the at least one second intra prediction mode is not comprised in the list.
9 . The video encoding method of claim 2 ,
wherein an intra prediction mode of one or more fourth intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and the third indicator indicates that the list is not used for the intra prediction for the target block.
10 . The video encoding method of claim 9 ,
wherein the one or more fourth intra prediction modes don't include any one of the at least one second intra prediction mode and the one or more third intra prediction modes.
11 . The non-transitory computer-readable medium of claim 4 ,
wherein the at least one second intra prediction mode is not comprised in the list.
12 . The non-transitory computer-readable medium of claim 4 ,
wherein an intra prediction mode of one or more fourth intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and the third indicator indicates that the list is not used for the intra prediction for the target block.
13 . The non-transitory computer-readable medium of claim 12 ,
wherein the one or more fourth intra prediction modes don't include any one of the at least one second intra prediction mode and the one or more third intra prediction modes.
14 . A method for sending a bitstream, the method comprising:
sending the bitstream comprising a first indicator for a target block;
wherein the first indicator represents information used to perform decoding for the target block,
wherein the decoding comprises determining a first intra prediction mode for the target block in a case that the first indicator indicates that intra prediction is used for the target block,
wherein the decoding comprises generating a prediction block by performing the intra prediction for the target block using the first intra prediction mode,
wherein the intra prediction for the target block is performed using at least one second intra prediction mode in a case that a second indicator indicates that the at least one second intra prediction mode is used for the intra prediction for the target block, and
wherein an intra prediction mode in a list comprising one or more third intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and a third indicator indicates that the list is used for the intra prediction for the target block.
15 . The method of claim 14 ,
wherein the at least one second intra prediction mode is not comprised in the list.
16 . The method of claim 14 ,
wherein an intra prediction mode of one or more fourth intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and the third indicator indicates that the list is not used for the intra prediction for the target block.
17 . The video decoding method of claim 16 ,
wherein the one or more fourth intra prediction modes don't include any one of the at least one second intra prediction mode and the one or more third intra prediction modes.
18 . A non-transitory computer-readable recording medium storing program instructions for transmitting a bitstream, the program instructions comprising:
an instruction to perform generating the bitstream; and
an instruction to transmit the bitstream,
wherein the generating the bitstream comprises:
generating the bitstream comprising a first indicator generated by a video encoding method,
wherein the video encoding method comprises:
determining a first intra prediction mode for a target block; and
generating a prediction block by performing intra prediction for the target block using the first intra prediction mode;
wherein the first indicator indicates whether the intra prediction is used for the target block,
wherein the intra prediction for the target block is performed using at least one second intra prediction mode in a case that a second indicator indicates that the at least one second intra prediction mode is used for the intra prediction for the target block, and
wherein an intra prediction mode in a list comprising one or more third intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and a third indicator indicates that the list is used for the intra prediction for the target block.
19 . The non-transitory computer-readable medium of claim 18 ,
wherein the at least one second intra prediction mode is not comprised in the list, and
an intra prediction mode of one or more fourth intra prediction modes is used for the intra prediction for the target block in a case that the second indicator indicates that the at least one second intra prediction mode is not used for the intra prediction for the target block and the third indicator indicates that the list is not used for the intra prediction for the target block.
20 . The non-transitory computer-readable medium of claim 19 ,
wherein the one or more fourth intra prediction modes don't include any one of the at least one second intra prediction mode and the one or more third intra prediction modes.