IP Library › Granted Patent US 12,581,123
Granted Patent B2
US 12,581,123 · App. 18/791,524 · Granted Mar 17, 2026

Avoidance of redundant signaling in multi-layer video bitstreams

Inventor: Ye-Kui Wang (San Diego, CA)
Assignee: Huawei Technologies Co., Ltd.
H04N19/70H04N19/105H04N19/136H04N19/159H04N19/172H04N19/174H04N19/187H04N19/188H04N19/30H04N19/423H04N19/46H04N19/463H04N19/50H04N19/593
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Quick Facts
Patent No.
US 12,581,123
App. No.
18/791,524
Filed
Aug 1, 2024
Granted
Mar 17, 2026
Kind
B2
Examiner
ZHOU, ZHIHAN
Art Unit
2482
USPC
375/240.26
Abstract

A method of decoding is provided. The method includes receiving a sub-bitstream having a sequence parameter set (SPS) with a profile tier level (PTL) syntax structure for an output layer set (OLS) with only one layer; setting a number of layers in the OLS equal to one based on the OLS having the only one layer; obtaining the PTL syntax structure for the OLS with the only one layer from the SPS when the number of layers in the OLS has been set equal to one; and decoding a picture from the only one layer using the PTL syntax structure to obtain a decoded picture. A corresponding method of encoding is also provided.

Claims (25)

1 . A method of encoding, comprising:

generating a video parameter set (VPS) and a sequence parameter set (SPS), wherein the VPS includes a list of profile tier level (PTL) syntax structures, wherein the list of PTL syntax structures comprises a first PTL syntax structure for a first output layer set (OLS), wherein the first OLS has only one layer, wherein the SPS is referred to by the only one layer and includes a second PTL syntax structure for the first OLS, and wherein the first PTL syntax structure and the second PTL syntax structure are identical; and

encoding the VPS and the SPS into a bitstream.

2 . The method of claim 1 , wherein the only one layer is a lowest layer among layers that refer to the SPS, and wherein the lowest layer is an independent layer.

3 . The method of claim 1 , wherein the list of PTL syntax structures is applied to one or more OLSs specified by the VPS.

4 . The method of claim 1 , wherein the VPS includes an index to the list of PTL syntax structures.

5 . The method of claim 4 , wherein the index is in a range of zero to a value, wherein the value plus 1 specifies a total number of the PTL syntax structures in the VPS.

6 . The method of claim 5 , wherein the value is that of a syntax element in the VPS, and wherein the syntax element is designated vps_num_ptls_minus1.

7 . The method of claim 1 , further comprising extracting a sub-bitstream from the bitstream, wherein the sub-bitstream includes the SPS but does not include the VPS.

8 . The method of claim 7 , further comprising transmitting the sub-bitstream toward a video decoder or storing the sub-bitstream.

9 . The method of claim 1 , further comprising storing the bitstream.

10 . A method of decoding, comprising:

receiving a bitstream comprising a video parameter set (VPS) and a sequence parameter set (SPS), wherein the VPS includes a list of profile tier level (PTL) syntax structures, wherein the list of PTL syntax structures comprises a first PTL syntax structure for a first output layer set (OLS), wherein the first OLS has only one layer, wherein the SPS is referred to by the only one layer and includes a second PTL syntax structure for the first OLS, and wherein the first PTL syntax structure and the second PTL syntax structure are identical; and

decoding the VPS and the SPS from the bitstream.

11 . The method of claim 10 , wherein the only one layer is a lowest layer among layers that refer to the SPS, and wherein the lowest layer is an independent layer.

12 . The method of claim 10 , wherein the list of PTL syntax structures is applied to one or more OLSs specified by the VPS.

13 . The method of claim 10 , wherein the VPS includes an index to the list of PTL syntax structures.

14 . The method of claim 13 , wherein the index is in a range of zero to a value, wherein the value plus 1 specifies a total number of the PTL syntax structures in the VPS.

15 . The method of claim 14 , wherein the value is that of a syntax element in the VPS, and wherein the syntax element is designated vps_num_ptls_minus1.

16 . The method of claim 10 , further comprising extracting a sub-bitstream from the bitstream, wherein the sub-bitstream includes the SPS but does not include the VPS.

17 . A non-transitory computer-readable medium storing an encoded bitstream and one or more instructions that, when executed by at least one processor, cause a decoding device to generate a video based on the encoded bitstream, the encoded bitstream comprising:

a video parameter set (VPS) and a sequence parameter set (SPS), wherein the VPS includes a list of profile tier level (PTL) syntax structures, wherein the list of PTL syntax structures comprises a first PTL syntax structure for a first output layer set (OLS), wherein the first OLS has only one layer, wherein the SPS is referred to by the only one layer and includes a second PTL syntax structure for the first OLS, and wherein the first PTL syntax structure and the second PTL syntax structure are identical.

18 . The non-transitory computer-readable medium of claim 17 , wherein the only one layer is a lowest layer among layers that refer to the SPS, and wherein the lowest layer is an independent layer.

19 . The non-transitory computer-readable medium of claim 17 , wherein the list of PTL syntax structures is applied to one or more OLSs specified by the VPS.

20 . The non-transitory computer-readable medium of claim 17 , wherein the VPS includes an index to the list of PTL syntax structures, wherein the index is in a range of zero to a value, wherein the value plus 1 specifies a total number of the PTL syntax structures in the VPS, and wherein the value is that of a syntax element in the VPS, and wherein the syntax element is designated vps_num_ptls_minus1.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 28, 2025
From: FUTUREWEI TECHNOLOGIES, INC.
To: HUAWEI TECHNOLOGIES CO., LTD.
Reel/Frame 073374/0521 →
Continuity (4)
Division 17713991 · Apr 5, 2022
Continuation PCTUS2020054449 · Oct 6, 2020
Provisional Application 62911808 · Oct 7, 2019
Related Publication 20240397109A1 · Nov 28, 2024
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