Systems and methods for signaling parameters in video coding

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

signaling, into a bitstream, a plurality of picture parameters included in a picture header of a picture in the video data;

signaling, into the bitstream, a present flag included in a sub-picture header of a sub-picture generated by dividing the picture;

determining, based on the present flag, whether a specific one of a plurality of sub-picture parameters is determined based on the sub-picture header or the picture header, the specific one of the plurality of sub-picture parameters corresponding to a specific one of the plurality of picture parameters; and

reconstructing the sub-picture based on the specific one of the plurality of sub-picture parameters when the specific one of the plurality of sub-picture parameters is determined based on the sub-picture header.

2. The method according to claim 1 , further comprising:

reconstructing the sub-picture based on the specific one of the plurality of picture parameters without signaling the specific one of the plurality of sub-picture parameters into the sub-picture header of the bitstream when the specific one of the plurality of sub-picture parameters is determined based on the picture header.

3. The method according to claim 1 , wherein the present flag indicates whether the specific one of the plurality of sub-picture parameters is included in the sub-picture header for overriding the specific one of the plurality of picture parameters.

4. The method according to claim 1 , wherein:

the sub-picture is a tile set including one or more tiles divided from the picture, and

the sub-picture header is a tile set header.

5. The method according to claim 1 , wherein:

the sub-picture is a slice divided from the picture, and

the sub-picture header is a slice header.

6. The method according to claim 1 , wherein the picture header is a non-video coding Layer VCL (non-VCL) network abstraction layer (NAL) unit in the bitstream.

7. The method according to claim 6 , wherein:

the plurality of picture parameters in the picture header includes at least one of a temporal motion vector prediction (MVP) enabled flag, a collected picture flag, and a motion vector difference (MVD) flag,

the temporal MVP enabled flag indicates whether a temporal motion vector predictor is enabled for the picture,

the collocated picture flag indicates whether a collocated picture used for a temporal MVP is derived from a reference picture list having a list number equal to zero, and

the MVD flag indicates whether an MVD coding syntax structure is not parsed.

8. The method according to claim 7 , wherein:

the temporal MVP enabled flag is a flag pic_temporal_mvp_enabled_flag,

the collected picture flag is a flag collocated_from_l0_flag, and

the MVD flag is a flag mvd_l1_zero_flag.

9. The method according to claim 1 , further comprising:

signaling the specific one of the plurality of sub-picture parameters into the sub-picture header of the bitstream when the present flag is equal to one; and

determining the specific one of the plurality of sub-picture parameters being equal to the specific one of the plurality of picture parameters without signaling the specific one of the plurality of sub-picture parameters into the sub-picture header of the bitstream when the present flag is equal to zero.

10. A non-transitory machine-readable medium of an electronic device storing a plurality of computer-executable instructions for encoding vidoe data, the plurality of computer-executable instructions when executed by a processing unit of the electronic device, causing the electronic device to:

signal, into a bitstream, a plurality of picture parameters included in a picture header of a picture in the video data;

signal, into the bitstream, a present flag included in a sub-picture header of a sub-picture generated by dividing the picture;

determine, based on the present flag, whether a specific one of a plurality of sub-picture parameters is determined based on the sub-picture header or the picture header, the specific one of the plurality of sub-picture parameters corresponding to a specific one of the plurality of picture parameters; and

reconstruct the sub-picture based on the specific one of the plurality of sub-picture parameters when the specific one of the plurality of sub-picture parameters is determined based on the sub-picture header.

11. The non-transitory machine-readable medium according to claim 10 , wherein the plurality of computer-executable instructions, when executed by the processing unit, further causes the electronic device to:

reconstruct the sub-picture based on the specific one of the plurality of picture parameters without signaling the specific one of the plurality of sub-picture parameters into the sub-picture header of the bitstream when the specific one of the plurality of sub-picture parameters is determined based on the picture header.

12. The non-transitory machine-readable medium according to claim 10 , wherein the present flag indicates whether the specific one of the plurality of sub-picture parameters is included in the sub-picture header for overriding the specific one of the plurality of picture parameters.

13. The non-transitory machine-readable medium according to claim 10 , wherein:

the sub-picture is a tile set including one or more tiles divided from the picture, and

the sub-picture header is a tile set header.

14. The non-transitory machine-readable medium according to claim 10 , wherein:

the sub-picture is a slice divided from the picture, and

the sub-picture header is a slice header.

15. The non-transitory machine-readable medium according to claim 10 , wherein the picture header is a non-video coding Layer VCL (non-VCL) network abstraction layer (NAL) unit in the bitstream.

16. The non-transitory machine-readable medium according to claim 15 , wherein:

the plurality of picture parameters in the picture header includes at least one of a temporal motion vector prediction (MVP) enabled flag, a collected picture flag, and a motion vector difference (MVD) flag,

the temporal MVP enabled flag indicates whether a temporal motion vector predictor is enabled for the picture,

the collocated picture flag indicates whether a collocated picture used for a temporal MVP is derived from a reference picture list having a list number equal to zero, and

the MVD flag indicates whether an MVD coding syntax structure is not parsed.

17. The machine-readable medium according to claim 16 , wherein:

the temporal MVP enabled flag is a flag pic_temporal_mvp_enabled_flag, and

the collected picture flag is a flag collocated_from_l0_flag and the MVD flag is a flag mvd_l1_zero_flag.

18. The machine-readable medium according to claim 10 , wherein the plurality of computer-executable instructions, when executed by the processing unit, further causes the electronic device to:

signal the specific one of the plurality of sub-picture parameters into the sub-picture header of the bitstream when the present flag is equal to one; and

determine the specific one of the plurality of sub-picture parameters being equal to the specific one of the plurality of picture parameters without signaling the specific one of the plurality of sub-picture parameters into the sub-picture header of the bitstream when the present flag is equal to zero.