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US 2022/0103858 A1Published application
Inter-prediction-based image or video coding using sbtmvp
AssigneeLG Electronics Inc.
InventorsHyeongmoon Jang, Naeri Park, Junghak Nam
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Abstract
According to the disclosure of the present document, in a subblock-based temporal motion vector prediction (sbTMVP), a position of a subblock for deriving a motion vector per subblock unit can be efficiently calculated, and thus video/image coding efficiency can be increased and hardware implementation can be simplified.
Claims15
An image decoding method performed by a decoding apparatus, the method comprising:
- deriving a position of a current subblock within a current block;
- deriving a reference subblock on a collocated reference picture based on the position of the current subblock;
- deriving a subblock temporal motion vector predictor (sbTMVP) candidate based on a motion vector of the reference subblock;
- deriving a motion vector of the current subblock based on the sbTMVP candidate;
- generating prediction samples of the current block based on the motion vector of the current subblock;
- and
- generating reconstruction samples based on the prediction samples,
- wherein the position of the current subblock is derived based on a center sample position of the current subblock,
- wherein the reference subblock is derived on the collocated reference picture based on the center sample position of the current subblock, and
- wherein the center sample position represents a position of a right-lower center sample positioned at a bottom right, among four samples positioned at the center.
7 more elements
An image encoding method performed by an encoding apparatus, the method comprising:
- deriving a position of a current subblock within a current block;
- deriving a reference subblock on a collocated reference picture based on the position of the current subblock;
- deriving a subblock temporal motion vector predictor (sbTMVP) candidate based on a motion vector of the reference subblock;
- deriving a motion vector of the current subblock based on the sbTMVP candidate;
- generating prediction samples of the current block based on the motion vector of the current subblock;
- generating information on residual samples derived based on the prediction samples;
- and
- encoding image information including the information on the residual samples,
- wherein the position of the current subblock is derived based on a center sample position of the current subblock,
- wherein the reference subblock is derived on the collocated reference picture based on the center sample position of the current subblock, and
- wherein the center sample position represents a position of a right-lower center sample positioned at a bottom right, among four samples positioned at the center.
8 more elements
A non-transitory computer-readable digital storage medium storing a bitstream generated by a method, the method comprising:
- deriving a position of a current subblock within a current block;
- deriving a reference subblock on a collocated reference picture based on the position of the current subblock;
- deriving a subblock temporal motion vector predictor (sbTMVP) candidate based on a motion vector of the reference subblock;
- deriving a motion vector of the current subblock based on the sbTMVP candidate;
- generating prediction samples of the current block based on the motion vector of the current subblock;
- generating information on residual samples derived based on the prediction samples;
- and
- encoding image information including the information on the residual samples to generate the bitstream,
- wherein the position of the current subblock is derived based on a center sample position of the current subblock,
- wherein the reference subblock is derived on the collocated reference picture based on the center sample position of the current subblock, and
- wherein the center sample position represents a position of a right-lower center sample positioned at a bottom right, among four samples positioned at the center.
8 more elements
Dependencies are inferred from the claim text.