Granted Patent B2

US 12,659,496 · App. 18/787,989 · Granted Jun 16, 2026

Inventors: Lu Yu (Dongguan, CN); Xiake Jin (Dongguan, CN); Chuchu Wang (Dongguan, CN); Sicheng Li (Dongguan, CN); Zhenyu Dai (Dongguan, CN)

Assignees: ZHEJIANG UNIVERSITY; GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

H04N19/30H04N19/17H04N19/46

Abstract

Claims (66)

1 . A resolution-based decoding method, comprising:

parsing a bitstream to obtain a current patch;

determining whether the current patch is a patch whose resolution is to be changed;

parsing the bitstream to obtain a scaling-rate parameter of the current patch, when the current patch is a patch whose resolution is to be changed;

determining a scaling factor for the current patch based on the scaling-rate parameter of the current patch; and

obtaining coordinates of the current patch in a three-dimension (3D) space coordinate system based on the scaling factor for the current patch;

wherein:

the scaling factor for the current patch comprises a width-scaling factor corresponding to a width scaling-rate parameter, in response to the scaling-rate parameter of the current patch comprising the width scaling-rate parameter; and/or

the scaling factor for the current patch comprises a height-scaling factor corresponding to a height scaling-rate parameter, in response to the scaling-rate parameter of the current patch comprising the height scaling-rate parameter.

2 . The method of claim 1 , wherein determining whether the current patch is a patch whose resolution is to be changed comprises:

parsing the bitstream to obtain a value of a first flag;

wherein the value of the first flag being a first value indicates that the current patch is a patch whose resolution is to be changed, and the value of the first flag being a second value indicates that the current patch is a patch whose resolution is not to be changed.

3 . The method of claim 1 , wherein determining whether the current patch is a patch whose resolution is to be changed comprises:

determining whether a current atlas where the current patch is located contains patches with different resolutions; and

determining whether the current patch is a patch whose resolution is to be changed, when the current atlas contains patches with different resolutions.

4 . The method of claim 3 , wherein determining whether the current atlas where the current patch is located contains patches with different resolutions comprises:

parsing the bitstream to obtain a value of a second flag;

wherein the value of the second flag being a third value indicates that the current atlas contains patches with different resolutions, and the value of the second flag being a fourth value indicates that the current atlas contains patches with a same resolution.

5 . The method of claim 1 , wherein determining whether the current patch is a patch whose resolution is to be changed comprises:

determining whether a current view where the current patch is located contains patches with different resolutions; and

determining whether the current patch is a patch whose resolution is to be changed, when the current view contains patches with different resolutions.

6 . The method of claim 5 , wherein determining whether the current patch is a patch whose resolution is to be changed comprises:

parsing the bitstream to obtain a value of a third flag;

wherein the value of the third flag being a fifth value indicates that the current view contains patches with different resolutions, and the value of the third flag being a sixth value indicates that the current view contains patches with a same resolution.

7 . The method of claim 1 , wherein determining the scaling factor for the current patch based on the scaling-rate parameter of the current patch comprises:

determining the scaling-rate parameter of the current patch as the scaling factor for the current patch.

8 . The method of claim 1 , further comprising:

determining the scaling-rate parameter of the current patch as a default value, when the current patch is a patch whose resolution is not to be changed.

9 . The method of claim 1 , wherein obtaining the coordinates of the current patch in the 3D space coordinate system based on the scaling factor for the current patch comprises:

obtaining first coordinates of the current patch in a two-dimension (2D) atlas coordinate system;

obtaining second coordinates of the current patch in a 3D patch coordinate system based on the first coordinates and the scaling factor; and

obtaining the coordinates of the current patch in the 3D space coordinate system by un-projecting the second coordinates to the 3D space coordinate system.

10 . The method of claim 9 , wherein obtaining the second coordinates of the current patch in the 3D patch coordinate system based on the first coordinates and the scaling factor comprises:

obtaining the second coordinates by projecting the current patch to the 3D patch coordinate system based on the first coordinates, the scaling factor, and a transform parameter;

wherein the transform parameter comprises a transform process for characterizing a swap operation and/or a transform process for characterizing an invert operation.

11 . A resolution-based encoding method, comprising:

obtaining a current patch;

determining whether the current patch is a patch whose resolution is to be changed; and

signalling a scaling-rate parameter of the current patch into a bitstream, when the current patch is a patch whose resolution is to be changed;

wherein:

a scaling factor for the current patch comprises a width-scaling factor corresponding to a width scaling-rate parameter, in response to the scaling-rate parameter of the current patch comprising the width scaling-rate parameter; and/or

the scaling factor for the current patch comprises a height-scaling factor corresponding to a height scaling-rate parameter, in response to the scaling-rate parameter of the current patch comprising the height scaling-rate parameter.

12 . The method of claim 11 , wherein signalling the scaling-rate parameter of the current patch into the bitstream comprises:

signalling the scaling-rate parameter of the current patch and a first flag into the bitstream;

wherein a value of the first flag being a first value indicates that the current patch is a patch whose resolution is to be changed, and the value of the first flag being a second value indicates that the current patch is a patch whose resolution is not to be changed.

13 . The method of claim 11 , wherein determining whether the current patch is a patch whose resolution is to be changed comprises:

determining whether a current atlas where the current patch is located contains patches with different resolutions; and

determining whether the current patch is a patch whose resolution is to be changed, when the current atlas contains patches with different resolutions.

14 . The method of claim 13 , wherein signalling the scaling-rate parameter of the current patch into the bitstream comprises:

signalling the scaling-rate parameter of the current patch and a second flag into the bitstream;

wherein a value of the second flag being a third value indicates that the current atlas contains patches with different resolutions, and the value of the second flag being a fourth value indicates that the current atlas contains patches with a same resolution.

15 . The method of claim 11 , wherein determining whether the current patch is a patch whose resolution is to be changed comprises:

determining whether a current view where the current patch is located contains patches with different resolutions; and

determining whether the current patch is a patch whose resolution is to be changed, when the current view contains patches with different resolutions.

16 . The method of claim 15 , wherein signalling the scaling-rate parameter of the current patch into the bitstream comprises:

signalling the scaling-rate parameter of the current patch and a third flag into the bitstream;

wherein a value of the third flag being a fifth value indicates that the current view contains patches with different resolutions, and the value of the third flag being a sixth value indicates that the current view contains patches with a same resolution.

17 . The method of claim 11 , further comprising:

signalling a default value of the scaling-rate parameter of the current patch into the bitstream, when the current patch is a patch whose resolution is not to be changed.

18 . A bitstream generated according to a resolution-based encoding method, the method comprising:

obtaining a current patch;

determining whether the current patch is a patch whose resolution is to be changed; and

signalling a scaling-rate parameter of the current patch into a bitstream, when the current patch is a patch whose resolution is to be changed;

wherein:

a scaling factor for the current patch comprises a width-scaling factor corresponding to a width scaling-rate parameter, when the scaling-rate parameter of the current patch comprises the width scaling-rate parameter; and/or

the scaling factor for the current patch comprises a height-scaling factor corresponding to a height scaling-rate parameter, when the scaling-rate parameter of the current patch comprises the height scaling-rate parameter.

Assignments (1)

Continuity (2)

References Cited (9)