Mode dependent intra smoothing filter table mapping methods for non-square prediction units

Patent metadata

Field	Value
Publication number	US-11190809-B2
Application number	US-202016806776-A
Country	US
Kind code	B2
Filing date	Mar 2, 2020
Priority date	Jun 15, 2011
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

An apparatus including a memory operably coupled to a processor. The processor is configured to determine whether to use an intra smoothing filter for a rectangular prediction unit (PU), wherein a width of the rectangular PU is different from a height of the rectangular PU.

First claim

What is claimed is:

1. An apparatus comprising:
a memory having stored computer instructions; and
a processor operably coupled to retrieve and execute the computer instructions from the memory to perform the following steps:
determine whether a plurality of conditions are satisfied, the plurality of conditions comprising a block size of a rectangular prediction unit (PU) being greater than a defined size;
determine whether to use an intra smoothing filter for the rectangular PU based on whether the plurality of conditions are satisfied, wherein a width of the rectangular PU is different from a height of the rectangular PU; and
apply the intra smoothing filter while performing intra prediction processing for the rectangular PU in response to determining to use the intra smoothing filter.

2. The apparatus of claim 1 , wherein the defined size is 32.

3. The apparatus of claim 1 , wherein the block size of the rectangular PU is at least one of 64, 256, or 1024.

4. The apparatus of claim 1 , wherein the plurality of conditions further comprise the block size of the rectangular PU not being less than the defined size.

5. The apparatus of claim 4 , wherein the defined size is 64.

6. The apparatus of claim 4 , wherein the block size of the rectangular PU is at least one of 64, 256, or 1024.

7. The apparatus of claim 1 , wherein the plurality of conditions further comprise the block size of the rectangular PU being equal to a block size of a square block.

8. The apparatus of claim 1 , wherein the processor further executes the computer instructions to perform the step of:
determine whether to apply the intra smoothing filter while performing the intra prediction processing for the rectangular PU based on a reference filter strategy, wherein the same reference filter strategy is applied to both a rectangular block and a square block.

9. The apparatus of claim 8 , wherein the same reference filter strategy is applied to both the rectangular block and the square block based on a block size.

10. The apparatus of claim 8 , wherein the rectangular block and the square block have a same block size.

11. The apparatus of claim 8 , wherein a block size of the rectangular block is at least one of 4×16, 16×4, 2×32, or 32×2 and a block size of the square block is 8×8, or wherein the block size of the rectangular block is at least one of 8×32 or 32×8 and the block size of the square block is 16×16.

12. The apparatus of claim 1 , wherein the plurality of conditions further comprises a width of the rectangular PU being the same as a width of a square PU included in a lookup table (LUT).

13. A method implemented by a processor, comprising:
determining, by the processor, whether a plurality of conditions are satisfied, the plurality of conditions comprising a block size of a rectangular prediction unit (PU) being greater than a defined size;
determining, by the processor, whether to use an intra smoothing filter for the rectangular PU based on whether the plurality of conditions are satisfied, wherein a width of the rectangular PU is different from a height of the rectangular PU; and
applying, by the processor, the intra smoothing filter while performing intra prediction processing for the rectangular PU in response to determining to use the intra smoothing filter.

14. The method of claim 13 , wherein the defined size is 32.

15. The method of claim 13 , wherein the block size of the rectangular PU is at least one of 64, 256, or 1024.

16. The method of claim 13 , wherein the plurality of conditions further comprise the block size of the rectangular PU not being less than the defined size.

17. The method of claim 16 , wherein the defined size is 64.

18. The method of claim 16 , wherein the block size of the rectangular PU is at least one of 64, 256, or 1024.

19. The method of claim 13 , wherein the plurality of conditions further comprise the block size of the rectangular PU being equal to a block size of a square block.

20. The method of claim 13 , further comprising determining whether to apply the intra smoothing filter while performing the intra prediction processing for the rectangular PU based on a reference filter strategy, wherein the same reference filter strategy is applied to both a rectangular block and a square block.

21. The method of claim 20 , wherein the same reference filter strategy is applied to both the rectangular block and the square block based on a block size.

22. The method of claim 20 , wherein the rectangular block and the square block have a same block size.

23. The method of claim 13 , wherein the plurality of conditions further comprises a condition associated with a component of color space.

24. The method of claim 20 , wherein a block size of the rectangular block is at least one of 4×16, 16×4, 2×32, or 32×2 and a block size of the square block is 8×8, or wherein the block size of the rectangular block is at least one of 8×32 or 32×8 and the block size of the square block is 16×16.

25. A non-transitory computer readable medium, comprising instructions executable by a processor such that, when executed, causes the processor to perform the following steps:
determine whether a plurality of conditions are satisfied, the plurality of conditions comprising a block size of a rectangular prediction unit (PU) being greater than a defined size;
determine whether to use an intra smoothing filter for the rectangular PU based on whether the plurality of conditions are satisfied, wherein a width of the rectangular PU is different from a height of the rectangular PU; and
apply the intra smoothing filter while performing intra prediction processing for the rectangular PU in response to determining to use the intra smoothing filter.

26. The non-transitory computer readable medium of claim 25 , wherein the defined size is 32.

27. The non-transitory computer readable medium of claim 25 , wherein the block size of the rectangular PU is at least one of 64, 256, or 1024.

28. The non-transitory computer readable medium of claim 27 , wherein the defined size is 64.

29. The non-transitory computer readable medium of claim 27 , wherein the block size of the rectangular PU is at least one of 64, 256, or 1024.

30. The non-transitory computer readable medium of claim 25 , wherein the plurality of conditions further comprise the block size of the rectangular PU not being less than the defined size.

31. The non-transitory computer readable medium of claim 25 , wherein the plurality of conditions further comprise the block size of the rectangular PU being equal to a block size of a square block.

32. The non-transitory computer readable medium of claim 31 , wherein the same reference filter strategy is applied to both the rectangular block and the square block based on a block size.

33. The non-transitory computer readable medium of claim 31 , wherein the rectangular block and the square block have a same block size.

34. The non-transitory computer readable medium of claim 31 , wherein a block size of the rectangular block is at least one of 4×16, 16×4, 2×32, or 32×2 and a block size of the square block is 8×8, or wherein the block size of the rectangular block is at least one of 8×32 or 32×8 and the block size of the square block is 16×16.

Assignees

• Futurewei Technologies Inc

Inventors

• Li Guichun
• Liu Lingzhi
• Lai Changcai
• Ling Nam
• Zheng Jianhua
• Zhang Chen-Xiong

Classifications

• H04N19/593

  involving spatial prediction techniques · CPC title

• H04N19/11

  among a plurality of spatial predictive coding modes · CPC title

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title

• H04N19/86 Primary

  involving reduction of coding artifacts, e.g. of blockiness · CPC title

• H04N19/117

  Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635) · CPC title