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US 12,598,315 B2Granted
Image encoding/decoding method and device for determining sub-layers on basis of required number of sub-layers, and bit-stream transmission method
AssigneeLG Electronics Inc.
InventorsHendry Hendry, Seethal Paluri, Seung Hwan Kim
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Abstract
An image encoding/decoding method and apparatus is provided. The image decoding method comprises determining at least one layer in an output layer set (OLS), and determining a number of sublayers for the at least one layer.
Claims5
An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
- determining at least one layer in an output layer set (OLS);
- and
- determining a number of sublayers for the at least one layer;
- and
- obtaining a sub-bitstream from a bitstream based on a number of sublayers for a current layer in the OLS,
- wherein the number of sublayers for the current layer is determined based on at least one of a minimum value between a first value and a second value or whether the current layer is an output layer,
- wherein the first value is determined based on a number of sublayers for a first layer, and
- wherein the second value is determined based on a maximum temporal identifier among temporal identifiers designated for at least one picture, of the current layer, to be referenced by the first layer,
- wherein the number of sublayers for the current layer is set to a maximum available number of sublayers based on the current layer being the output layer,
- wherein, among a non-output layers in the OLS, the number of sublayers for the current layer is determined in order from a non-output layer with the maximum layer index to a non-output layer with a lower layer index,
- wherein the sub-bitstream is obtained by removing a predetermined network abstraction layer (NAL) unit from the bitstream,
- wherein the predetermined NAL unit is determined based on whether a value of a temporal identifier of the predetermined NAL unit is equal to or greater than a value corresponding to a number of sublayers determined for a layer corresponding to the predetermined NAL unit among layers of a predetermined OLS.
9 more elements
An image encoding method performed by an image encoding apparatus, the image encoding method comprising:
- determining at least one layer in an output layer set (OLS);
- and
- determining a number of sublayers for the at least one layer,
- wherein a number of sublayers for a current layer in the OLS is determined based on at least one of a minimum value between a first value and a second value or whether the current layer is an output layer,
- wherein the first value is determined based on a number of sublayers for a first layer, and
- wherein the second value is determined based on a maximum temporal identifier among temporal identifiers designated for at least one picture, of the current layer, to be referenced by the first layer,
- wherein the number of sublayers for the current layer is set to a maximum available number of sublayers based on the current layer being the output layer, and
- wherein, among a non-output layers in the OLS, the number of sublayers for the current layer is determined in order from a non-output layer with the maximum layer index to a non-output layer with a lower layer index.
5 more elements
A method for transmitting a bitstream generated by an image encoding method, the image encoding method comprising:
- determining at least one layer in an output layer set (OLS);
- and
- determining a number of sublayers for the at least one layer,
- wherein a number of sublayers for a current layer in the OLS is determined based on at least one of a minimum value between a first value and a second value or whether the current layer is an output layer,
- wherein the first value is determined based on a number of sublayers for a first layer, and
- wherein the second value is determined based on a maximum temporal identifier among temporal identifiers designated for at least one picture, of the current layer, to be referenced by the first layer,
- wherein the number of sublayers for the current layer is set to a maximum available number of sublayers based on the current layer being the output layer, and
- wherein, among a non-output layers in the OLS, the number of sublayers for the current layer is determined in order from a non-output layer with the maximum layer index to a non-output layer with a lower layer index.
5 more elements
Dependencies are inferred from the claim text.