Intra BC and inter unification

• US 9,918,105 B2
• Filed: 10/06/2015
• Issued: 03/13/2018
• Est. Priority Date: 10/07/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Pang, Chao, Wang, Ye-Kui, Rapaka, Krishnakanth, Seregin, Vadim, Karczewicz, Marta
• Primary Examiner(s): Diep, Nhon
• Application Number:
  US14/876,699
• Publication Number:
  US 20160100189A1
• Time in Patent Office: 889 Days
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/513 Processing of motion vectors
• CPC Class Codes: H04N 19/52 by predictive encoding
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

In general, the disclosure describes techniques related to block vector coding for Intra Block Copy and Inter modes. In one example, the disclosure is directed to a video coding device comprising a memory configured to store video data and one or more processors. The video coding device is configured to determine a reference picture used for coding the current video block and determine a picture order count (POC) value for the reference picture. In response to the POC value for the reference picture being equal to a POC value for a current picture that includes the current video block, the video coding device sets a value of a syntax element to indicate that a reference picture list includes the current picture. Otherwise, the video coding device sets the value of the syntax element to indicate that the reference picture list does not include the current picture.

Claims

1. A method for decoding video data, the method comprising:

receiving a first syntax element that indicates whether a first picture that includes a first video block of the video data is eligible to be in a reference picture list;

determining a value of the first syntax element;

in response to the first syntax element indicating that the first picture is eligible to be in the reference picture list;

adding the first picture to the reference picture list;

determining that a motion vector for the first video block has integer-pel precision; and

converting each motion vector predictor candidate of a plurality of motion vector predictor candidates for the first picture to integer-pel precision either prior to being used in a candidate derivation process or after the candidate derivation process is completed;

decoding the first video block using a block of a picture from the reference picture list and a first residual;

receiving a second syntax element that indicates whether a second picture that includes a second video block of the video data is eligible to be in a reference picture list;

determining a value of the second syntax element;

in response to the second syntax element indicating that the second picture is not eligible to be in the reference picture list, restricting the second picture from being placed in the reference picture list; and

decoding the second video block using a block of a picture from the reference picture list and a second residual.

2. The method of claim 1, wherein the first picture is an intra random access picture comprising one of a P-slice or a B-slice.

3. The method of claim 2, wherein the intra random access picture further comprises a set of one or more different syntax elements that specify a non-empty reference picture set.

4. The method of claim 1, wherein a reference picture used for decoding the first picture includes decoded non-filtered samples of the first picture.

5. The method of claim 1, wherein the first syntax element is located in one of a picture parameter set or a sequence parameter set.

6. The method of claim 1, further comprising:

determining a temporal motion vector predictor based at least in part on a picture that is different than the first picture.

7. The method of claim 1, wherein the first picture is one of a clean random access picture or a broken link access picture, and wherein the method further comprises:

receiving a third syntax element indicating a number of pictures eligible to be used as a prediction reference for the first picture, wherein the third syntax element has a value of 1.

8. The method of claim 1, further comprising:

disabling a temporal motion vector predictor when the reference picture list only includes the first picture.

9. The method of claim 1, wherein the first video block comprises a luma component and a chroma component, and wherein only one of the luma component or the chroma component has integer-pel precision.

10. The method of claim 1, wherein the first picture is eligible to be added to the reference picture list, wherein each prediction sample of the first picture is contained within a picture boundary of the current picture.

11. The method of claim 1, further comprising:

determining a neighboring picture of the first picture, wherein the neighboring block is either a spatially neighboring picture or a temporally neighboring picture;

determining a predictive block in the neighboring picture, wherein the predictive block includes a motion vector;

using the motion vector to determine a reference block in a reference picture for the first block, wherein the reference block includes the motion prediction information; and

decoding the first video block using the motion prediction information of the reference block and the first residual.

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

determining a first reference picture used for encoding a first video block of the video data;

determining a picture order count (POC) value for the first reference picture;

in response to the POC value for the first reference picture being equal to a POC value for a first picture that includes the first video block;

setting a value of a syntax element to indicate that a reference picture list includes the first picture;

determining that a motion vector for the current video block has integer-pel precision; and

converting each motion vector predictor candidate of a plurality of motion vector predictor candidates for the current picture to integer-pel precision either prior to being used in a candidate derivation process or after the candidate derivation process is completed;

encoding the first video block using a block of a picture from the reference picture list and a first residual

determining a second reference picture used for encoding a second video block of the video data;

determining a POC value for the second reference picture;

in response to the POC value for the second reference picture being different than the POC value for the second picture, setting the value of the syntax element to indicate that the reference picture list does not include the second picture; and

encoding the second video block using a block of a picture from the reference picture list and a second residual.

13. The method of claim 12, wherein the first picture is an intra random access picture comprising one of a P-slice or a B-slice.

14. The method of claim 13, wherein the intra random access picture further comprises a set of one or more different syntax elements that specify a non-empty reference picture set.

15. The method of claim 12, wherein the reference picture includes decoded non-filtered samples of the first picture.

16. The method of claim 12, wherein the first syntax element is located in one of a picture parameter set or a sequence parameter set.

17. The method of claim 12, further comprising:

determining a temporal motion vector predictor based at least in part on a picture that is different than the first picture.

18. The method of claim 12, wherein the first picture is one of a clean random access picture or a broken link access picture, and wherein the method further comprises:

setting a value of a third syntax element indicating a number of pictures eligible to be used as a prediction reference for the first picture to 1.

19. The method of claim 12, further comprising:

disabling a temporal motion vector predictor when the reference picture list only includes the first picture.

20. The method of claim 12, wherein the first video block comprises a luma component and a chroma component, and wherein only one of the luma component or the chroma component has integer-pel precision.

21. The method of claim 12, wherein the POC value for the reference picture is equal to the POC value for the first picture, wherein each prediction sample of the first picture is contained within a picture boundary of the first picture.

22. The method of claim 12, further comprising:

determining a neighboring picture of the first picture, wherein the neighboring block is either a spatially neighboring picture or a temporally neighboring picture;

determining a predictive block in the neighboring picture, wherein the predictive block includes a motion vector;

using the motion vector to determine a reference block in the reference picture for the first block, wherein the reference block includes the motion prediction information; and

encoding the first video block using the motion prediction information of the reference block and the first residual.

23. A video decoding device comprising:

a memory configured to store video data; and

one or more processors configured to;

receive a syntax element that indicates whether a current picture that includes a current video block of the video data is eligible to be in a reference picture list;

determine a value of the syntax element;

in response to the syntax element indicating that the first picture is eligible to be in the reference picture list;

add the current picture to the reference picture list;

determine that a motion vector for the current video block has integer-pel precision; and

convert each motion vector predictor candidate of a plurality of motion vector predictor candidates for the current picture to integer-pel precision either prior to being used in a candidate derivation process or after the candidate derivation process is completed;

in response to the syntax element indicating that the second picture is not eligible to be in the reference picture list, restrict the current picture from being placed in the reference picture list; and

decode the current video block using a block of a picture from the reference picture list and a residual.

24. The video decoding device of claim 23, wherein the one or more processors are further configured to:

disable a temporal motion vector predictor when the reference picture list only includes the current picture.

25. The video decoding device of claim 23, wherein the current video block comprises a luma component and a chroma component, and wherein only one of the luma component or the chroma component has integer-pel precision.

26. The video decoding device of claim 23, wherein the one or more processors are further configured to:

determine a neighboring picture of the current picture, wherein the neighboring block is either a spatially neighboring picture or a temporally neighboring picture;

determine a predictive block in the neighboring picture, wherein the predictive block includes a motion vector;

use the motion vector to determine a reference block in a reference picture for the current block, wherein the reference block includes the motion prediction information; and

decode the current video block using the motion prediction information of the reference block and the residual.

27. A non-transitory computer-readable storage medium storing instructions that when executed by one or more processors cause the one or more processors to:

receive a syntax element that indicates whether a current picture that includes a current video block of the video data is eligible to be in a reference picture list;

determine a value of the syntax element;

in response to the syntax element indicating that the first picture is eligible to be in the reference picture list;

add the current picture to the reference picture list;

determine that a motion vector for the current video block has integer-pel precision; and

convert each motion vector predictor candidate of a plurality of motion vector predictor candidates for the current picture to integer-pel precision either prior to being used in a candidate derivation process or after the candidate derivation process is completed;

in response to the syntax element indicating that second picture is not eligible to be in the reference picture list, restrict the current picture from being placed in the reference picture list; and

decode the current video block using a block of a picture from the reference picture list and a residual.