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US 2022/0103855 A1Published application
Temporal motion vector predictor candidate-based image or video coding of subblock unit
AssigneeLG Electronics Inc.
InventorsHyeongmoon Jang, Naeri Park, Junghak Nam
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Abstract
According to the disclosure of the present document, a subblock position for deriving a subblock unit motion vector in a subblock-based temporal motion vector prediction (sbTMVP) can be efficiently calculated, thereby enabling video/image coding efficiency to increase and a simplifying effect for hardware implementation to be obtained.
Claims18
An image decoding method performed by a decoding apparatus, the method comprising:
- deriving reference subblocks inside a collocated reference picture for subblocks in a current block;
- deriving a subblock-based temporal motion information candidate based on the reference subblocks;
- deriving motion information for the subblocks in the current block based on the subblock-based temporal motion information candidate;
- generating prediction samples of the current block based on the motion information for the subblocks in the current block;
- and
- generating reconstruction samples based on the prediction samples,
- wherein the reference subblocks are derived from the collocated reference picture based on a below-right center sample position of each of the subblocks in the current block,
- wherein the subblock-based temporal motion information candidate includes subblock unit motion vectors, and
- wherein a base motion vector is used as a subblock unit motion vector for a reference subblock that is not available among the reference subblocks.
6 more elements
An image encoding method performed by an encoding apparatus, comprising:
- deriving reference subblocks inside a collocated reference picture for subblocks in a current block;
- deriving a subblock-based temporal motion information candidate based on the reference subblocks;
- deriving motion information for the subblocks in the current block based on the subblock-based temporal motion information candidate;
- generating prediction samples of the current block based on the motion information for the subblocks in the current block;
- deriving residual samples based on the prediction samples;
- and
- encoding image information including information on the residual samples,
- wherein the reference subblocks are derived from the collocated reference picture based on a below-right center sample position of each of the subblocks in the current block,
- wherein the subblock-based temporal motion information candidate includes subblock unit motion vectors, and
- wherein a base motion vector is used as a subblock unit motion vector for a reference subblock that is not available among the reference subblocks.
7 more elements
(canceled)
A non-transitory computer-readable digital storage medium storing a bitstream generated by a method, the method comprising:
- deriving reference subblocks inside a collocated reference picture for subblocks in a current block;
- deriving a subblock-based temporal motion information candidate based on the reference subblocks;
- deriving motion information for the subblocks in the current block based on the subblock-based temporal motion information candidate;
- generating prediction samples of the current block based on the motion information for the subblocks in the current block;
- deriving residual samples based on the prediction samples;
- and
- encoding image information including information on the residual samples to generate the bitstream,
- wherein the reference subblocks are derived from the collocated reference picture based on a below-right center sample position of each of the subblocks in the current block,
- wherein the subblock-based temporal motion information candidate includes subblock unit motion vectors, and
- wherein a base motion vector is used as a subblock unit motion vector for a reference subblock that is not available among the reference subblocks.
7 more elements
Dependencies are inferred from the claim text.