Image decoding method and device using DPB parameter for OLS
AssigneeLG Electronics Inc.
InventorHendry Hendry
Life of this patent
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Abstract
An image decoding method performed by a decoding device according to the present document comprises the steps of: obtaining image information including an output layer set (OLS) decoded picture buffer (DPB) parameter index for a target OLS and DPB parameter information; deriving DPB parameter information for the target OLS on the basis of the OLS DPB parameter index; performing a picture management process on pictures of a DPB on the basis of the DPB parameter information for the target OLS; configuring a reference picture list for a current picture on the basis of the pictures of the DPB; and performing an inter prediction on a block in the current picture on the basis of the reference picture list.
Claims8
An image decoding method performed by a decoding apparatus, the method comprising:
- obtaining image information including Decoded Picture Buffer (DPB) parameter syntax structures and an Output Layer Set (OLS) DPB parameter index for a target OLS;
- deriving DPB parameter syntax structure for the target OLS based on the OLS DPB parameter index;
- performing a picture management process for pictures of a DPB based on the DPB parameter syntax structure for the target OLS;
- constructing a reference picture list for a current picture based on the pictures of the DPB;
- and
- performing inter prediction for a block in the current picture based on the reference picture list,
- wherein the OLS DPB parameter index specifies the DPB parameter syntax structure for the target OLS among the DPB parameter syntax structures,
- wherein an OLS DPB parameter flag for whether the DPB parameter syntax structure for the target OLS is present in a Video Parameter Set (VPS) syntax is obtained,
- wherein the OLS DPB parameter syntax structure is obtained in the VPS syntax based on a value of the OLS DPB parameter flag.
An image encoding method performed by an encoding apparatus, the method comprising:
- generating Decoded Picture Buffer (DPB) parameter syntax structures including DPB parameter syntax structure of a target Output Layer Set (OLS);
- performing a picture management process for pictures of a DPB based on the DPB parameter syntax structure of the target OLS;
- constructing a reference picture list for a current picture based on the pictures of the DPB;
- performing inter prediction for a block in the current picture based on the reference picture list;
- generating an OLS DPB parameter index for the DPB parameter syntax structure of the target OLS;
- and
- encoding image information including the OLS DPB parameter index, the DPB parameter syntax structures and prediction information for the block,
- wherein the OLS DPB parameter index specifies the DPB parameter syntax structure for the target OLS among the DPB parameter syntax structures,
- wherein an OLS DPB parameter flag for whether the DPB parameter syntax structure for the target OLS is present in a Video Parameter Set (VPS) syntax is encoded,
- wherein the OLS DPB parameter syntax structure is signaled in the VPS syntax based on a value of the OLS DPB parameter flag.
A transmission method of data for image, the method comprising:
- obtaining a bitstream of image information including Decoded Picture Buffer (DPB) parameter syntax structures and an Output Layer Set (OLS) DPB parameter index for a target OLS;
- and
- transmitting the data including the bitstream of the image information including the DPB parameter syntax structures and the OLS DPB parameter index,
- wherein DPB parameter syntax structure for the target OLS is derived based on the OLS DPB parameter index, and a picture management process for pictures of a DPB is performed based on the DPB parameter syntax structure for the target OLS,
- wherein the OLS DPB parameter index specifies the DPB parameter syntax structure for the target OLS among the DPB parameter syntax structures,
- wherein an OLS DPB parameter flag for whether the DPB parameter syntax structure for the target OLS is present in a Video Parameter Set (VPS) syntax is obtained,
- wherein the OLS DPB parameter syntax structure is obtained in the VPS syntax based on a value of the OLS DPB parameter flag.
Dependencies are inferred from the claim text.