Method and apparatus for video encoding and decoding using list of predictor candidates

1. A method, comprising:

receiving, for a block being decoded in a picture, information indicating a decoding mode;

determining, for the block being decoded, a first set of predictor candidates, the determining comprising:

ordering potential predictor candidates in a second set of predictor candidates based on a distance between the predictor candidates, the ordering comprises:

adding a candidate, of the potential predictor candidates, to the second set, and

further adding candidates, of the remaining potential predictor candidates, to the second set, wherein each added candidate is with the largest distance from the candidate previously added to the second set,

for at least one predictor candidate in the second set, determining that the predictor candidate is different from any predictor candidate in a subset of predictor candidates from the first set and responsively adding the predictor candidate to the first set,

wherein the subset of predictor candidates comprises a last N predictor candidates in the first set, N being an integer between 1 and a maximum number of candidates in the first set; and

decoding the block based on the received information and the first set of predictor candidates.

2. The method of claim 1 , wherein N is set to 2, and the ordering comprises:

adding a candidate, of the remaining potential predictor candidates, with the largest distance from the firstly added candidate followed by adding a candidate, of the remaining potential predictor candidates, with the smallest distance from the firstly added candidate.

3. The method of claim 1 , wherein the second set of predictor candidates comprises spatial and temporal predictor candidates and wherein the distance between the predictor candidates comprises a spatial distance and a temporal distance.

4. The method of claim 1 , wherein the ordering of the potential predictor candidates is further based on relative positions between the potential predictor candidates, the relative positions comprising left, above right, left bottom, above, and above left.

5. The method of claim 1 , wherein the ordering of the potential predictor candidates is adaptive to a size of the block.

6. The method of claim 1 , wherein the ordering of the potential predictor candidates is further based on relative positions between the potential predictor candidates, the relative positions comprising left, above right, left bottom, above, above left.

7. The method of claim 1 , wherein after adding at least N candidates, of the potential predictor candidates, to the second set, the adding further comprises:

adding a candidate, of the remaining potential predictor candidates, with the largest distance from an added candidate at 1 position away and with the smallest distance from an added candidate at N positions away.

8. An apparatus comprising one or more processors, wherein the one or more processors are configured to:

receive, for a block being decoded in a picture, information indicating a decoding mode;

determine, for the block being decoded, a first set of predictor candidates, the determining comprising:

ordering potential predictor candidates in a second set of predictor candidates based on a distance between the predictor candidates, the ordering comprises:

adding a candidate, of the potential predictor candidates, to the second set, and

further adding candidates, of the remaining potential predictor candidates, to the second set, wherein each added candidate is with the largest distance from the candidate previously added to the second set,

for at least one predictor candidate in the second set, on condition that the predictor candidate is different from any predictor candidate in a subset of predictor candidates from the first set, adding the predictor candidate to the first set,

wherein the subset of predictor candidates comprises a last N predictor candidates in the first set, N being an integer between 1 and a maximum number of candidates in the first set; and

decode the block based on the received information and the first set of predictor candidates.

9. The apparatus of claim 8 , wherein N is set to 2, and the ordering comprises:

adding a candidate, of the remaining potential predictor candidates, with the largest distance from the firstly added candidate followed by adding a candidate, of the remaining potential predictor candidates, with the smallest distance from the firstly added candidate.

10. The apparatus of claim 8 , wherein the second set of predictor candidates comprises spatial and temporal predictor candidates and wherein the distance between the predictor candidates comprises a spatial distance and a temporal distance.

11. The apparatus of claim 8 , wherein the ordering of the potential predictor candidates is further based on relative positions between the potential predictor candidates, the relative positions comprising left, above right, left bottom, above, and above left.

12. The apparatus of claim 8 , wherein the ordering of the potential predictor candidates is adaptive to a size of the block.

13. A method, comprising:

determining, for a block being encoded, a first set, the determining comprising:

ordering potential predictor candidates in a second set of predictor candidates based on a distance between the predictor candidates, the ordering comprises:

adding a candidate, of the potential predictor candidates, to the second set, and

further adding candidates, of the remaining potential predictor candidates, to the second set, wherein each added candidate is with the largest distance from the candidate previously added to the second set,

for at least one predictor candidate in the second set, determining that the candidate is different from any candidate in a subset of predictor candidates from the first set and responsively adding the candidate to the first set,

wherein the subset of predictor candidates comprises a last N predictor candidates in the first set, N being an integer between 1 and a maximum number of candidates in the first set; and

encoding the block based on a candidate from the first set of predictor candidates.

14. The method of claim 13 , wherein N is set to 2, and the ordering comprises:

adding a candidate, of the remaining potential predictor candidates, with the largest distance from the firstly added candidate followed by adding a candidate with the smallest distance from the firstly added candidate.

15. The method of claim 13 , wherein the second set of predictor candidates comprises spatial and temporal predictor candidates and wherein the distance between the predictor candidates comprises a spatial distance and a temporal distance.

16. The method of claim 13 , wherein after adding at least N candidates, of the potential predictor candidates, to the second set, the adding further comprises:

adding a candidate, of the remaining potential predictor candidates, with the largest distance from an added candidate at 1 position away and with the smallest distance from an added candidate at N positions away.

17. An apparatus comprising one or more processors, wherein the one or more processors are configured to:

determine, for a block being encoded, a first set of predictor candidates, the determining comprising:

ordering potential predictor candidates in a second set of predictor candidates based on a distance between the predictor candidates, the ordering comprises:

adding a candidate, of the potential predictor candidates, to the second set, and

further adding candidates, of the remaining potential predictor candidates, to the second set, wherein each added candidate is with the largest distance from the candidate previously added to the second set,

for at least one candidate in the second set, on condition that the predictor candidate is different from any predictor candidate in a subset of predictor candidates from the first set, adding the predictor candidate to the first set,

wherein the subset of predictor candidates comprises a last N predictor candidates in the first set, N being an integer between 1 and a maximum number of candidates in the first set; and

encode the block based on a predictor candidate from the first predictor set.

18. The apparatus of claim 17 , wherein N is set to 2, and the ordering comprises:

adding a candidate, of the remaining potential predictor candidates, with the largest distance from the firstly added candidate followed by adding a candidate with the smallest distance from the firstly added candidate.

19. The apparatus of claim 17 , wherein the second set of predictor comprises spatial and temporal predictor candidates and wherein the distance between the predictor candidates comprises a spatial distance and a temporal distance.

20. The apparatus of claim 17 , wherein the order of predictor candidates is further based on relative positions between predictor candidates, the relative positions comprising left, above right, left bottom, above, and above left.