Granted Patent B2

US 12,284,325 · App. 17/892,911 · Granted Apr 22, 2025

Inventors: Philippe Hanhart (La Conversion, CH); Yuwen He (San Diego, CA); Yan Ye (San Diego, CA)

Assignee: InterDigital VC Holdings, Inc.

H04N13/161H04N19/172H04N19/186H04N19/593H04N19/597

Abstract

Claims (62)

1. A device for video decoding, the device comprising:

a processor configured to:

determine a chroma sample location type associated with a picture, wherein the picture comprises a plurality of faces, and luma samples are in a face of the plurality of faces;

based on a frame packing configuration, determine a face rotation associated with the face;

based on the chroma sample location type and the face rotation associated with the face, determine a filter for down-sampling the luma samples associated with the face;

down-sample the luma samples based on the filter; and

predict chroma samples based on the down-sampled luma samples.

2. The device of claim 1 , wherein the face is a first face, the filter is a first filter, and the processor is further configured to:

based on the frame packing configuration, determine a face rotation associated with a second face;

determine a second filter for down-sampling luma samples associated with the second face based on the chroma sample location type and the face rotation associated with the second face;

down-sample the luma samples in the second face based on the second filter; and

predict chroma samples in the second face based on the down-sampled luma samples in the second face.

3. The device of claim 1 , wherein a cross-component linear model (CCLM) is used to predict the chroma samples based on the down-sampled luma samples.

4. The device of claim 1 , wherein the processor is further configured to:

obtain, from video data, a chroma sample location type presence indication configured to indicate whether a chroma sample location type indication is present in the video data; and

based on a condition that the chroma sample location type indication is present, obtain a value of the chroma sample location type indication, wherein the chroma sample location type is determined based on the value of the chroma sample location type indication.

5. The device of claim 4 , wherein the processor is further configured to:

obtain, from the video data, an indication of a chroma format; and

based on the indication of the chroma format, determine that the chroma format is equal to 4:2:0, wherein the value of the chroma sample location type indication is obtained based on the chroma format equaling 4:2:0.

6. The device of claim 1 , wherein the processor is further configured to:

based on the chroma sample location type, determine a first filter candidate and a second filter candidate for down-sampling the luma samples, wherein the filter for down-sampling luma samples is determined by selecting from the first filter candidate and the second filter candidate.

7. A method for video decoding, comprising:

determining a chroma sample location type associated with a picture, wherein the picture comprises a plurality of faces, and luma samples are in a face of the plurality of faces;

based on a frame packing configuration, determining a face rotation associated with the face;

based on the chroma sample location type and the face rotation associated with the face, determining a filter for down-sampling the luma samples associated with the face;

down-sampling the luma samples based on the filter; and

predicting chroma samples based on the down-sampled luma samples.

8. The method of claim 7 , wherein the face is a first face, the filter is a first filter, further comprising:

based on the frame packing configuration, determining a face rotation associated with a second face;

determining a second filter for down-sampling luma samples associated with the second face based on the chroma sample location type and the face rotation associated with the second face;

down-sampling the luma samples in the second face based on the second filter; and

predicting chroma samples in the second face based on the down-sampled luma samples in the second face.

9. The method of claim 7 , wherein a cross-component linear model (CCLM) is used to predict the chroma samples based on the down-sampled luma samples.

10. The method of claim 7 , further comprising:

obtaining, from video data, a chroma sample location type presence indication configured to indicate whether a chroma sample location type indication is present in the video data; and

based on a condition that the chroma sample location type indication is present, obtaining a value of the chroma sample location type indication, wherein the chroma sample location type is determined based on the value of the chroma sample location type indication.

11. The method of claim 10 , further comprising:

obtaining, from the video data, an indication of a chroma format; and

based on the indication of the chroma format, determining that the chroma format is equal to 4:2:0, wherein the value of the chroma sample location type indication is obtained based on the chroma format equaling 4:2:0.

12. The method of claim 7 , further comprising:

based on the chroma sample location type, determining a first filter candidate and a second filter candidate for down-sampling the luma samples;

wherein the filter for down-sampling luma samples is determined by selecting from the first filter candidate and the second filter candidate.

13. A device for video encoding, the device comprising:

a processor configured to:

determine a chroma sample location type associated with a picture, wherein the picture comprises a plurality of faces, and luma samples are in a face of the plurality of faces;

based on a frame packing configuration, determine a face rotation associated with the face;

based on the chroma sample location type and the face rotation associated with the face, determine a filter for down-sampling the luma samples associated with the face;

down-sample the luma samples based on the filter; and

encode chroma samples based on the down-sampled luma samples.

14. The device of claim 13 , wherein the face is a first face, the filter is a first filter, and the processor is further configured to:

based on the frame packing configuration, determine a face rotation associated with a second face;

determine a second filter for down-sampling luma samples associated with the second face based on the chroma sample location type and the face rotation associated with the second face;

down-sample the luma samples in the second face based on the second filter; and

encode chroma samples in the second face based on the down-sampled luma samples in the second face.

15. The device of claim 13 , wherein a cross-component linear model (CCLM) is used to predict the chroma samples based on the down-sampled luma samples.

16. The device of claim 13 , wherein the processor is further configured to:

determine whether to include a chroma sample location type indication in video data;

include a chroma sample location type presence indication in the video data configured to indicate whether the chroma sample location type indication is present in the video data; and

based on a determination to include the chroma sample location type indication, include a value of the chroma sample location type indication in the video data.

17. The device of claim 16 , wherein the processor is further configured to:

determine a chroma format is equal to 4:2:0; and

based on the chroma format being equal to 4:2:0, determine to include the chroma sample location type indication in the video data.

Assignments (2)

Continuity (4)

References Cited (70)