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US 2025/0168386 A1Published application
Image encoding/decoding method and apparatus for determining sublayer on basis of whether or not to make reference between layers, and method for transmitting bitstream
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 performed by the image decoding apparatus may comprise determining inter-layer direct reference and determining the number of sublayers of a current layer based on the inter-layer direct reference.
Claims6
An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
- determining whether a first layer is a direct reference layer for a current layer, wherein the first layer is a layer other than the current layer;
- and
- determining a number of sublayers of the current layer based on the whether the first layer is the direct reference layer for the current layer,
- wherein based on that the current layer is not an output layer, the number of the sublayers of the current layer is set as a predetermined value determined based on the whether the first layer is the direct reference layer for the current layer,
- wherein whether the first layer is the direct reference layer for the current layer is determined by direct reference layer information obtained from a bitstream for a layer encoded based on inter-layer prediction,
- wherein whether the layer is encoded based on the inter-layer prediction is determined based on independent layer information obtained from the bitstream,
- wherein the number of sublayers of the current layer is determined to be an available maximum number of sublayers, based on whether the current layer is the output layer,
- wherein the predetermined value is determined based on maximum identifier information, and
- wherein the maximum identifier information indicates that a picture having a temporal identifier greater than a value identified by the maximum identifier information among a plurality of pictures of the current layer is not used as an inter-layer reference picture to decode a target picture of a second layer.
6 more elements
An image encoding method performed by an image encoding apparatus, the image encoding method comprising:
- determining whether a first layer is a direct reference layer for a current layer, wherein the first layer is a layer other than a current layer;
- and
- determining a number of sublayers of the current layer based on the whether the first layer is the direct reference layer for the current layer,
- wherein based on that the current layer is not an output layer, the number of sublayers of the current layer is determined to be a predetermined value determined based on the whether the first layer is the direct reference layer for the current layer,
- wherein whether the first layer is the direct reference layer for the current layer is determined by direct reference layer information encoded into a bitstream for a layer encoded based on inter-layer prediction,
- wherein whether the layer is encoded based on the inter-layer prediction is determined based on independent layer information encoded into the bitstream,
- wherein the number of sublayers of the current layer is determined to be an available maximum number of sublayers, based on whether the current layer is the output layer,
- wherein the predetermined value is determined based on maximum identifier information, and
- wherein the maximum identifier information indicates that a picture having a temporal identifier greater than a value identified by the maximum identifier information among a plurality of pictures of the current layer is not used as an inter-layer reference picture to decode a target picture of a second layer.
6 more elements
A method for transmitting a bitstream generated by an image encoding method, the image encoding method comprising:
- determining whether a first layer is a direct reference layer for a current layer, wherein the first layer is a layer other than a current layer;
- and
- determining a number of sublayers of the current layer based on the whether the first layer is the direct reference layer for the current layer,
- wherein based on that the current layer is not an output layer, the number of sublayers of the current layer is determined to be a predetermined value determined based on the whether the first layer is the direct reference layer for the current layer,
- wherein whether the first layer is the direct reference layer for the current layer is determined by direct reference layer information encoded into a bitstream for a layer encoded based on inter-layer prediction,
- wherein whether the layer is encoded based on the inter-layer prediction is determined based on independent layer information encoded into the bitstream,
- wherein the number of sublayers of the current layer is determined to be an available maximum number of sublayers, based on whether the current layer is the output layer,
- wherein the predetermined value is determined based on maximum identifier information, and
- wherein the maximum identifier information indicates that a picture having a temporal identifier greater than a value identified by the maximum identifier information among a plurality of pictures of the current layer is not used as an inter-layer reference picture to decode a target picture of a second layer.
6 more elements
Dependencies are inferred from the claim text.