IP Library › Granted Patent US 12,200,264
Granted Patent B2
US 12,200,264 · App. 17/713,998 · Granted Jan 14, 2025

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 12,200,264
App. No.
17/713,998
Granted
Jan 14, 2025
Kind
B2
Abstract

A method of decoding includes receiving a bitstream having a plurality of layers and a video parameter set (VPS), where the VPS includes a direct reference layer flag, where the direct reference layer flag equal to a first value specifies that a second layer is not a direct reference layer for a first layer, and where the direct reference layer flag equal to a second value specifies that the second layer is the direct reference layer for the first layer; deriving a reference layer flag by: initially setting the reference layer flag to the first value; and updating the reference layer flag to the second value when the direct reference layer flag has the second value; and decoding a picture from the first layer in accordance with the reference layer flag to obtain a decoded picture.

Claims (39)

1. A method of decoding implemented by a video decoder, comprising:

receiving a bitstream having a plurality of layers and a video parameter set (VPS), wherein the VPS includes a direct reference layer flag (vs_direct_ref_layer_flag), wherein the direct reference layer flag equal to 0 specifies that a second layer j is not a direct reference layer for a first layer i, and wherein the direct reference layer flag equal to 1 specifies that the second layer j is the direct reference layer for the first layer i;

deriving a reference layer flag (LayerUsedAsRefLayerFlag[j]) by:

initially setting the reference layer flag to 0; and

updating the reference layer flag to 1 when the direct reference layer flag is equal to 1; and

decoding a picture from the first layer i in accordance with the reference layer flag to obtain a decoded picture,

wherein the reference layer flag specifies whether a layer with a layer index j is used as a reference layer by any other layer.

2. The method of claim 1 , wherein an index value of [i] is in a range of zero to vps_max_layers_minus1.

3. The method of claim 1 , wherein vps_max_layers_minus1 plus 1 specifies a number of layers specified by the VPS.

4. The method of claim 1 , further comprising displaying the decoded picture on a display of an electronic device.

5. A method of encoding implemented by a video encoder, the method comprising:

setting a direct reference layer flag (vps_direct_ref_layer_flag) equal to 0 to specify that a second layer j is not a direct reference layer for a first layer i, and to 1 to specify that the second layer j is the direct reference layer for the first layer i, wherein the direct reference layer flag is configured for use in derivation of a reference layer flag (LayerUsedAsRef LayerFlag[j]), wherein the reference layer flag specifies whether a layer with a layer index j is used as a reference layer by any other layer;

generating a video parameter set (VPS) including the direct reference layer flag;

encoding the VPS into a video bitstream; and

storing the video bitstream for communication toward a video decoder.

6. The method of claim 5 , wherein an index value of [i] is in a range of zero to vps_max_layers_minus1, wherein vps_max_layers_minus1 plus 1 specifies a number of layers specified by the VPS, which is a maximum allowed number of layers in each coded video sequence (CVS) referring to the VPS.

7. The method of claim 5 , further comprising deriving the reference layer flag and performing, by a hypothetical reference decoder (HRD) of the video encoder, a conformance test on the video bitstream using the reference layer flag, wherein the reference layer flag is derived by:

initially setting the reference layer flag to 0; and

updating the reference layer flag to 1 when the direct reference layer flag is equal to 1.

8. The method of claim 5 , further comprising transmitting the video bitstream toward the video decoder.

9. A decoding device, comprising:

a receiver configured to receive a bitstream having a plurality of layers and a video parameter set (VPS), wherein the VPS includes a direct reference layer flag (vps_direct_ref_layer_flag), wherein the direct reference layer flag equal to 0 specifies that a second layer j is not a direct reference layer for a first layer i, and wherein the direct reference layer flag equal to 1 specifies that the second layer j is the direct reference layer for the first layer i; and

a memory containing instructions;

one or more processors coupled to the memory, the one or more processors configured to implement the instructions to cause the decoding device to:

derive a reference layer flag (LayerUsedAsRefLayerFlag[j]) by:

initially setting the reference layer flag to 0; and

updating the reference layer flag to 1 when the direct reference layer flag is equal to 1; and

decode a picture from the first layer i in accordance with the reference layer flag to obtain a decoded picture,

wherein the reference layer flag specifies whether a layer with a layer index j is used as a reference layer by any other layer.

10. The decoding device of claim 9 , further comprising a display configured to display the picture as decoded.

11. An encoding device, comprising:

a memory containing instructions;

one or more processors coupled to the memory, the one or more processors configured to implement the instructions to cause the encoding device to:

set a direct reference layer flag (vps_direct_ref_layer_flag) equal to 0 to specify that a second layer j is not a direct reference layer for a first layer i, and to 1 to specify that the second layer j is the direct reference layer for the first layer i, wherein the direct reference layer flag is configured for use in derivation of a reference layer flag (LayerUsedAsRefLayerFlag[j]), wherein the reference layer flag specifies whether a layer with a layer index j is used as a reference layer by any other layer;

generate a video parameter set (VPS) including the direct reference layer flag;

encode the VPS into a video bitstream; and

a transmitter coupled to the processor, the transmitter configured to transmit the video bitstream toward a video decoder.

12. The encoding device of claim 11 , wherein the first layer has an index value of [i] and the second layer has an index value of [j], wherein the index value of [i ] is in a range of zero to vps_max_layers_minus1.

13. The encoding device of claim 12 , wherein vps_max_layers_minus1 plus 1 specifies a number of layers specified by the VPS, which is a maximum allowed number of layers in each coded video sequence (CVS) referring to the VPS.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 18, 2024
From: FUTUREWEI TECHNOLOGIES, INC.
To: HUAWEI TECHNOLOGIES CO., LTD.
Reel/Frame 067753/0349 →
Continuity (3)
Continuation PCTUS2020054451 · Oct 6, 2020
Provisional Application 62911808 · Oct 7, 2019
Related Publication 20220239938A1 · Jul 28, 2022
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