Method and device for video signal processing

1. A method for video signal processing, performed by a decoder, comprising:

determining an intra prediction mode of a current block;

determining a reference sample used for an intra prediction of the current block;

obtaining a predetermined matrix based on the intra prediction mode; and

predicting the current block based on the reference sample and the matrix, wherein predicting the current block based on the reference sample and the matrix comprises:

generating a prediction block by applying the matrix to the reference sample, wherein the prediction block is generated at predetermined positions in the current block;

wherein predicting the current block based on the reference sample and the matrix further comprises:

performing interpolation on the current block based on at least one of the following: the prediction block or reconstructed samples adjacent to the current block.

2. The method according to claim 1 , wherein determining the reference sample comprises:

determining a neighboring region of the current block; and

performing down-sampling on the determined neighboring region, wherein the neighboring region is divided into a plurality of sample groups, the sample group comprises one or more samples, a representative value of the sample group is determined as the reference sample, and the representative value is one of the following: an average, a minimum, a maximum, a mode value and an intermediate value.

3. The method according to claim 1 , wherein the predetermined positions in the current block are determined based on a ratio of the size of the current block to a size of a sampling block.

4. The method according to claim 1 , wherein predicting the current block based on the reference sample and the matrix further comprises:

performing a transpose of prediction samples of the generated prediction block.

5. The method according to claim 1 , wherein the matrix is determined from a plurality of matrix groups by further consideration of a size and shape of the current block.

6. A method for video signal processing, performed by an encoder, comprising:

determining an intra prediction mode of a current block;

determining a reference sample used for an intra prediction of the current block;

obtaining a predetermined matrix based on the intra prediction mode; and

predicting the current block based on the reference sample and the matrix, wherein predicting the current block based on the reference sample and the matrix comprises:

generating a prediction block by applying the matrix to the reference sample, wherein the prediction block is generated at predetermined positions in the current block;

wherein predicting the current block based on the reference sample and the matrix further comprises:

performing interpolation on the current block based on at least one of the following: the prediction block or reconstructed samples adjacent to the current block.

7. The method according to claim 6 , wherein determining the reference sample comprises:

determining a neighboring region of the current block; and

performing down-sampling on the determined neighboring region, wherein the neighboring region is divided into a plurality of sample groups, the sample group comprises one or more samples, a representative value of the sample group is determined as the reference sample, and the representative value is one of the following: an average, a minimum, a maximum, a mode value and an intermediate value.

8. The method according to claim 6 , wherein the predetermined positions in the current block are determined based on a ratio of the size of the current block to a size of a sampling block.

9. The method according to claim 6 , wherein predicting the current block based on the reference sample and the matrix further comprises:

performing a transpose of prediction samples of the generated prediction block.

10. The method according to claim 6 , wherein the matrix is determined from a plurality of matrix groups by further consideration of a size and shape of the current block.

11. A decoder, comprising:

a processor; and

a memory, wherein the memory is configured to store computer programs capable of running in the processor, and when the computer programs are run by the processor, the processor is configured to:

determine an intra prediction mode of a current block;

determine a reference sample used for an intra prediction of the current block;

obtain a predetermined matrix based on the intra prediction mode; and

generate a prediction block by applying the matrix to the reference sample, wherein the prediction block is generated at predetermined positions in the current block;

wherein the processor is further configured to:

perform interpolation on the current block based on at least one of the following:

the prediction block or reconstructed samples adjacent to the current block.

12. The decoder according to claim 11 , wherein the processor is further configured to:

determine a neighboring region of the current block; and

perform down-sampling on the determined neighboring region, wherein the neighboring region is divided into a plurality of sample groups, the sample group comprises one or more samples, a representative value of the sample group is determined as the reference sample, and the representative value is one of the following: an average, a minimum, a maximum, a mode value and an intermediate value.

13. The decoder according to claim 11 , wherein the predetermined positions in the current block are determined based on a ratio of the size of the current block to a size of a sampling block.

14. The decoder according to claim 11 , wherein the processor is further configured to:

perform a transpose of prediction samples of the generated prediction block.

15. The decoder according to claim 11 , wherein the matrix is determined from a plurality of matrix groups by further consideration of a size and shape of the current block.

16. An encoder, comprising:

a processor; and

a memory, wherein the memory is configured to store computer programs capable of running in the processor, and when the computer programs are run by the processor, the processor is configured to:

determine an intra prediction mode of a current block;

determine a reference sample used for an intra prediction of the current block;

obtain a predetermined matrix based on the intra prediction mode; and

generate a prediction block by applying the matrix to the reference sample, wherein the prediction block is generated at predetermined positions in the current block;

wherein the processor is further configured to:

perform interpolation on the current block based on at least one of the following:

the prediction block or reconstructed samples adjacent to the current block.

17. The encoder according to claim 16 , wherein the processor is configured to:

determine a neighboring region of the current block; and

perform down-sampling on the determined neighboring region, wherein the neighboring region is divided into a plurality of sample groups, the sample group comprises one or more samples, a representative value of the sample group is determined as the reference sample, and the representative value is one of the following: an average, a minimum, a maximum, a mode value and an intermediate value.

18. The encoder according to claim 16 , wherein the predetermined positions in the current block are determined based on a ratio of the size of the current block to a size of a sampling block.

19. The encoder according to claim 16 , wherein the processor is further configured to:

perform a transpose of prediction samples of the generated prediction block.

20. The encoder according to claim 16 , wherein the matrix is determined from a plurality of matrix groups by further consideration of a size and shape of the current block.