Video signal processing method and device
Disclosed is a video signal processing method and device for encoding or decoding a video signal. More specifically, disclosed are a video signal processing method and a video signal processing device for performing the method, the method comprising: obtaining reference line information indicating a reference line for intra prediction of a current block among a plurality of reference lines comprising neighboring samples of the current block; determining, on the basis of the reference line information, an intra prediction mode for the current block among a plurality of intra prediction modes constituting an intra prediction mode set; and decoding the current block on the basis of a plurality of reference samples on the reference line according to the reference line information and the determined intra prediction mode, wherein the plurality of reference lines include a first reference line comprising neighboring samples on a line adjacent to the boundary of the current block and a second reference line comprising neighboring samples on a line spaced a distance corresponding to a predetermined number of samples apart from the boundary of the current block.
1. A video signal decoding device comprising a processor,
wherein the processor is configured to:
determine an intra prediction mode for prediction of a current block based on whether an upper boundary of the current block and an upper boundary of a coding tree block are adjacent or separated by a specific number of samples,
wherein the coding tree block is an upper level region of the current block,
reconstruct the current block based on the intra prediction mode,
wherein the intra prediction mode is included in a first intra prediction mode set or a second intra prediction mode set,
wherein the first intra prediction mode set a planar mode, a DC mode, and a plurality of angular modes,
wherein the second intra prediction mode set includes a part of intra prediction modes included in the first intra prediction mode set, and the second intra prediction mode set does not include the planar mode,
wherein the second intra prediction mode set includes angular modes determined based on an intra prediction mode corresponding to at least one of neighboring blocks of the current block.
2. The video signal decoding device of claim 1 ,
wherein when the upper boundary of the current block and the upper boundary of the coding tree block are separated by the specific number of samples,
the intra prediction mode for prediction of a current block is included in the first intra prediction mode set or the second intra prediction mode set.
3. The video signal decoding device of claim 1 ,
wherein when the upper boundary of the current block is adjacent to the upper boundary of the coding tree block,
the intra prediction mode for prediction of a current block is included in the first intra prediction mode set.
4. The video signal decoding device of claim 1 ,
wherein the intra prediction mode for prediction of a current block is indicated by a syntax element.
5. The video signal decoding device of claim 1 ,
wherein the specific number of samples represents a number of integer pixels.
6. A video signal encoding device comprising a processor,
wherein the processor is configured to
obtain a bitstream to be decoded by a decoder using a decoding method, the decoding method comprising:
determining an intra prediction mode for prediction of a current block based on whether an upper boundary of the current block and an upper boundary of a coding tree block are adjacent or separated by a specific number of samples,
wherein the coding tree block is an upper level region of the current block,
reconstructing the current block based on the intra prediction mode,
wherein the intra prediction mode is included in a first intra prediction mode set or a second intra prediction mode set,
wherein the first intra prediction mode set includes a planar mode, a DC mode, and a plurality of angular modes,
wherein the second intra prediction mode set includes a part of intra prediction modes included in the first intra prediction mode set, and the second intra prediction mode set does not include the planar mode,
wherein the second intra prediction mode set includes angular modes determined based on an intra prediction mode corresponding to at least one of neighboring blocks of the current block.
7. The video signal encoding device of claim 6 ,
wherein when the upper boundary of the current block and the upper boundary of the coding tree block are separated by the specific number of samples,
the intra prediction mode for prediction of a current block is included in the first intra prediction mode set or the second intra prediction mode set.
8. The video signal encoding device of claim 6 ,
wherein when the upper boundary of the current block is adjacent to the upper boundary of the coding tree block,
the intra prediction mode for prediction of a current block is included in the first intra prediction mode set.
9. The video signal encoding device of claim 6 ,
wherein the intra prediction mode for prediction of a current block is indicated by a syntax element.
10. The video signal encoding device of claim 6 ,
wherein the specific number of samples represents a number of integer pixels.
11. A method for obtaining a bitstream, the method comprising:
determining an intra prediction mode for prediction of a current block based on whether an upper boundary of the current block and an upper boundary of a coding tree block are adjacent or separated by a specific number of samples,
wherein the coding tree block is an upper level region of the current block; and
obtaining the bitstream including information related to the intra prediction mode for decoding the current block,
wherein the intra prediction mode is included in a first intra prediction mode set or a second intra prediction mode set,
wherein the first intra prediction mode set includes a planar mode, a DC mode, and a plurality of angular modes,
wherein the second intra prediction mode set includes a part of intra prediction modes included in the first intra prediction mode set, and the second intra prediction mode set does not include the planar mode, and
wherein the second intra prediction mode set includes angular modes determined based on an intra prediction mode corresponding to at least one of neighboring blocks of the current block.
12. The method of claim 11 ,
wherein when the upper boundary of the current block and the upper boundary of the coding tree block are separated by the specific number of samples,
the intra prediction mode for prediction of a current block is included in the first intra prediction mode set or the second intra prediction mode set.
13. The method of claim 11 ,
wherein when the upper boundary of the current block is adjacent to the upper boundary of the coding tree block,
the intra prediction mode for prediction of a current block is included in the first intra prediction mode set.
14. The method of claim 11 ,
wherein the intra prediction mode for prediction of a current block is indicated by a syntax element.
15. The method of claim 11 ,
wherein the specific number of samples represents a number of integer pixels.