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US 12,225,201 B2Granted
Image or video coding based on temporal motion information in units of subblocks
AssigneeLG Electronics Inc.
InventorsJie Zhao, Seunghwan Kim
Life of this patent
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Abstract
According to the disclosure of this document, in subblock-based temporal motion vector prediction (sbTMVP), base motion information for a subblock for which a motion vector is not available can be efficiently derived, and through this, video/image coding efficiency can be improved.
Claims9
An image decoding method performed by a decoding apparatus, the method comprising:
- deriving reference subblocks on a collocated reference picture for subblocks of a current block;
- deriving motion information for the subblocks of the current block based on motion information for the reference subblocks;
- generating prediction samples based on the motion information for the subblocks of the current block;
- and
- generating reconstructed samples based on the prediction samples,
- wherein for a reference subblock in which a motion vector is not available among the reference subblocks, base motion information is derived, and
- wherein the base motion information is used as the motion information for a subblock of the current block corresponding to the reference subblock,
- wherein the base motion information is derived based on one of the reference subblocks in a reference block located corresponding to the current block on the collocated reference picture,
- wherein the base motion information is derived based on a first reference subblock having an initially available motion vector, by checking whether a motion vector is available according to a determined order with respect to the reference subblocks in the reference block, and
- wherein, based on the base motion information being not derived, a subblock-based temporal motion vector prediction (sbTMVP) is specified as available.
7 more elements
An image encoding method performed by an encoding apparatus, the method comprising:
- deriving reference subblocks on a collocated reference picture for subblocks of a current block;
- deriving motion information for the subblocks of the current block based on motion information for the reference subblocks;
- generating prediction samples based on the motion information for the subblocks of the current block;
- deriving residual samples based on the prediction samples;
- and
- encoding image information including information on the residual samples,
- wherein for a reference subblock in which a motion vector is not available among the reference subblocks, base motion information is derived, and
- the base motion information is used as the motion information for a subblock of the current block corresponding to the reference subblock,
- wherein the base motion information is derived based on one of the reference subblocks in a reference block located corresponding to the current block on the collocated reference picture,
- wherein the base motion information is derived based on a first reference subblock having an initially available motion vector, by checking whether a motion vector is available according to a determined order with respect to the reference subblocks in the reference block, and
- wherein, based on the base motion information being not derived, a subblock-based temporal motion vector prediction (sbTMVP) is specified as available.
8 more elements
A non-transitory computer-readable storage medium storing encoded information causing an image decoding apparatus to perform an image decoding method, wherein the decoding method comprises:
- deriving reference subblocks on a collocated reference picture for subblocks of a current block;
- deriving motion information for the subblocks of the current block based on motion information for the reference subblocks;
- generating prediction samples based on the motion information for the subblocks of the current block;
- and
- generating reconstructed samples based on the prediction samples,
- wherein for a reference subblock in which a motion vector is not available among the reference subblocks, base motion information is derived, and
- the base motion information is used as the motion information for a subblock of the current block corresponding to the reference subblock,
- wherein the base motion information is derived based on one of the reference subblocks in a reference block located corresponding to the current block on the collocated reference picture,
- wherein the base motion information is derived based on a first reference subblock having an initially available motion vector, by checking whether a motion vector is available according to a determined order with respect to the reference subblocks in the reference block, and
- wherein, based on the base motion information being not derived, a subblock-based temporal motion vector prediction (sbTMVP) is specified as available.
7 more elements
Dependencies are inferred from the claim text.