IP Library › Granted Patent US 10,264,280

Granted Patent B2

US 10,264,280 · App. 15/481,303 · Granted Apr 16, 2019

Enhanced intra-prediction mode signaling for video coding using neighboring mode

Inventors: Wei-Jung Chien (San Diego, CA); Marta Karczewicz (San Diego, CA); Xianglin Wang (San Diego, CA)

Assignee: QUALCOMM Incorporated

H04N19/593 H04N19/11 H04N19/176 H04N19/186 H04N19/196 H04N19/46 H04N19/463

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Quick Facts

Patent No.: US 10,264,280
App. No.: 15/481,303
Granted: Apr 16, 2019
Kind: B2

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USPTO Patent Center↗ Full Patent PDF↗

Abstract

This disclosure describes techniques for intra-prediction mode signaling for video coding. In one example, a video coder is configured to determine, for a block of video data, a set of most probable intra-prediction modes such that the set of most probable intra-prediction modes has a size that is equal to a predetermined number that is greater than or equal to two. The video coder is also configured to code a value representative of an actual intra-prediction mode for the block based at least in part on the set of most probable intra-prediction modes and code the block using the actual intra-prediction mode. The video coder may further be configured to code the block using the actual intra-prediction mode, e.g., to encode or decode the block. Video encoders and video decoders may implement these techniques.

Claims (68)

1. A method of encoding video data, the method comprising:

determining, for a chrominance block corresponding to a luminance block, a mapping of a set of values to a set of intra-prediction modes that are available for the chrominance block, the set of intra-prediction modes that are available for the chrominance block comprising horizontal mode, vertical mode, planar mode, DC mode, and luma signal prediction mode,

wherein when an actual intra-prediction mode for the luminance block comprises a mode other than horizontal mode, vertical mode, planar mode, and DC mode, the set of intra-prediction modes that are available for the chrominance block further comprises a reuse of luma intra-prediction mode mapped from a first value of the set of values, and

wherein when the actual intra-prediction mode for the luminance block comprises one of horizontal mode, vertical mode, planar mode, and DC mode, the set of intra-prediction modes that are available for the chrominance block further comprises a mode other than horizontal mode, vertical mode, planar mode, and DC mode mapped from the first value of the set of values, and the set of intra-prediction modes that are available for the chrominance block does not comprise the reuse of luma intra-prediction mode;

encoding, based on the mapping of the set of values to the set of intra-prediction modes that are available for the chrominance block, a value representative of an actual intra-prediction mode for the chrominance block, wherein the actual intra-prediction mode for the chrominance block is an intra-prediction mode in the set of intra-prediction modes that are available for the chrominance block; and

encoding the chrominance block using the actual intra-prediction mode for the chrominance block.

2. The method of claim 1 , wherein when the actual intra-prediction mode is the planar, vertical, horizontal, or DC mode, a chroma intra-prediction mode is an upper-right direction intra-prediction mode.

3. The method of claim 1 , wherein a chroma prediction direction is the same as a luma prediction direction.

4. A method of decoding video data, the method comprising:

decoding, based on the mapping of the set of values to the set of intra-prediction modes that are available for the chrominance block, a value representative of an actual intra-prediction mode for the chrominance block, wherein the actual intra-prediction mode for the chrominance block is an intra-prediction mode in the set of intra-prediction modes that are available for the chrominance block; and

decoding the chrominance block using the actual intra-prediction mode for the chrominance block.

5. The method of claim 4 , wherein when the actual intra-prediction mode is the planar, vertical, horizontal, or DC mode, a chroma intra-prediction mode is an upper-right direction intra-prediction mode.

6. The method of claim 4 , wherein a chroma prediction direction is the same as a luma prediction direction.

7. A non-transitory computer program product comprising a computer-readable storage medium having stored thereon instructions that, when executed, cause a processor of a video encoding device to:

determine, for a chrominance block corresponding to a luminance block, a mapping of a set of values to a set of intra-prediction modes that are available for the chrominance block, the set of intra-prediction modes that are available for the chrominance block comprising horizontal mode, vertical mode, planar mode, DC mode, and luma signal prediction mode,

encode, based on the mapping of the set of values to the set of intra-prediction modes that are available for the chrominance block, a value representative of an actual intra-prediction mode for the chrominance block, wherein the actual intra-prediction mode for the chrominance block is an intra-prediction mode in the set of intra-prediction modes that are available for the chrominance block; and

encode the chrominance block using the actual intra-prediction mode for the chrominance block.

8. The non-transitory computer program product of claim 7 , wherein when the actual intra-prediction mode is the planar, vertical, horizontal, or DC mode, a chroma intra-prediction mode is an upper-right direction intra-prediction mode.

9. The non-transitory computer program product of claim 7 , wherein a chroma prediction direction is the same as a luma prediction direction.

10. A non-transitory computer program product comprising a computer-readable storage medium having stored thereon instructions that, when executed, cause a processor of a video encoding device to:

decode, based on the mapping of the set of values to the set of intra-prediction modes that are available for the chrominance block, a value representative of an actual intra-prediction mode for the chrominance block, wherein the actual intra-prediction mode for the chrominance block is an intra-prediction mode in the set of intra-prediction modes that are available for the chrominance block; and

decode the chrominance block using the actual intra-prediction mode for the chrominance block.

11. The non-transitory computer program product of claim 10 , wherein when the actual intra-prediction mode is the planar, vertical, horizontal, or DC mode, a chroma intra-prediction mode is an upper-right direction intra-prediction mode.

12. The non-transitory computer program product of claim 10 , wherein a chroma prediction direction is the same as a luma prediction direction.

13. A device for video encoding, comprising:

means for determining, for a chrominance block corresponding to a luminance block, a mapping of a set of values to a set of intra-prediction modes that are available for the chrominance block, the set of intra-prediction modes that are available for the chrominance block comprising horizontal mode, vertical mode, planar mode, DC mode, and luma signal prediction mode,

means for encoding, based on the mapping of the set of values to the set of intra-prediction modes that are available for the chrominance block, a value representative of an actual intra-prediction mode for the chrominance block, wherein the actual intra-prediction mode for the chrominance block is an intra-prediction mode in the set of intra-prediction modes that are available for the chrominance block; and

means for encoding the chrominance block using the actual intra-prediction mode for the chrominance block.

14. The device of claim 13 , wherein when the actual intra-prediction mode is the planar, vertical, horizontal, or DC mode, a chroma intra-prediction mode is an upper-right direction intra-prediction mode.

15. The device of claim 13 , wherein a chroma prediction direction is the same as a luma prediction direction.

16. A device for video decoding, comprising:

means for encoding the chrominance block using the actual intra-prediction mode for the chrominance block.

17. The device of claim 16 , wherein when the actual intra-prediction mode is the planar, vertical, horizontal, or DC mode, a chroma intra-prediction mode is an upper-right direction intra-prediction mode.

18. The device of claim 16 , wherein a chroma prediction direction is the same as a luma prediction direction.

19. A device for encoding video data, the device comprising:

a memory configured to store a block of video data; and

a video encoder configured to:

determine, for a chrominance block corresponding to a luminance block of the block of video data, a mapping of a set of values to a set of intra-prediction modes that are available for the chrominance block, the set of intra-prediction modes that are available for the chrominance block comprising horizontal mode, vertical mode, planar mode, DC mode, and luma signal prediction mode,

encode the chrominance block using the actual intra-prediction mode for the chrominance block.

20. The device of claim 19 , wherein when the actual intra-prediction mode is the planar, vertical, horizontal, or DC mode, a chroma intra-prediction mode is an upper-right direction intra-prediction mode.

21. The device of claim 19 , wherein a chroma prediction direction is the same as a luma prediction direction.

22. A device for decoding video data, the device comprising:

a memory configured to store a block of video data; and

a video decoder configured to:

decode the chrominance block using the actual intra-prediction mode for the chrominance block.

23. The device of claim 22 , wherein when the actual intra-prediction mode is the planar, vertical, horizontal, or DC mode, a chroma intra-prediction mode is an upper-right direction intra-prediction mode.

24. The device of claim 22 , wherein a chroma prediction direction is the same as a luma prediction direction.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 24, 2017

From: CHIEN, WEI-JUNG; KARCZEWICZ, MARTA; WANG, XIANGLIN

To: QUALCOMM INCORPORATED

Reel/Frame 042124/0483 →

Continuity (6)

Continuation 13491076 · Jun 7, 2012

Provisional Application 61533118 · Sep 9, 2011

Provisional Application 61504664 · Jul 5, 2011

Provisional Application 61503712 · Jul 1, 2011

Provisional Application 61495332 · Jun 9, 2011

Related Publication 20170214940A1 · Jul 27, 2017

Cited By (1)

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