JPWO2020205942A5

JPWO2020205942A5 -

Info

Publication number: JPWO2020205942A5
Application number: JP2021557957A
Authority: JP
Publication date: 2023-03-23
Anticipated expiration: 2040-04-01

Claims

A method of decoding video data, comprising:
determining a prediction block for inter-predicting the current block;
determining horizontal and vertical displacements for gradient-based prediction refinement of one or more samples of the prediction block;
rounding the horizontal and vertical displacements to an accuracy level that is the same for different inter-prediction modes;
determining one or more refinement offsets based on the rounded horizontal and vertical displacements;
modifying the one or more samples of the prediction block based on the determined one or more refinement offsets to produce a modified prediction block;
and reconstructing the current block based on the modified prediction block.

A method of encoding video data, comprising:
determining a prediction block for inter-predicting the current block;
determining horizontal and vertical displacements for gradient-based prediction refinement of one or more samples of the prediction block;
rounding the horizontal and vertical displacements to an accuracy level that is the same for different inter-prediction modes;
determining one or more refinement offsets based on the rounded horizontal and vertical displacements;
modifying the one or more samples of the prediction block based on the determined one or more refinement offsets to produce a modified prediction block;
determining a residual value indicative of the difference between the current block and the modified prediction block;
and signaling information indicative of said residual value.

further comprising truncating the one or more refinement offsets;
modifying the one or more samples of the prediction block comprises modifying the one or more samples of the prediction block based on the truncated one or more refinement offsets; The method of Claim 1.

3. The method of claim 1 or 2 , wherein a first of the different inter-prediction modes is an affine mode and a second of the different inter-prediction modes is a bidirectional optical flow (BDOF) mode.

further comprising determining an inter-prediction mode for inter-predicting the current block;
3. The method of claim 1 or 2 , wherein determining the horizontal and vertical displacements comprises determining the horizontal and vertical displacements based on the determined inter-prediction mode.

2. The method of claim 1, wherein the accuracy level based on sub-pel parts of motion vectors is 1/64.

determining a horizontal gradient based on a first set of samples of the one or more samples of the predictive block;
determining a vertical gradient based on a second set of samples of the one or more samples of the prediction block;
wherein determining said one or more refinement offsets comprises determining said one or more refinement offsets based on said rounded horizontal and vertical displacements and said horizontal and vertical gradients; 3. The method of paragraph 1 or 2 .

determining the one or more refinement offsets comprises determining g _x (i,j)*Δv _x (i,j)+g _y (i,j)*Δv _y (i,j); g _x (i,j) is the horizontal gradient for a sample located at (i,j) of the one or more samples, and Δv _x (i,j) is the one is the rounded horizontal displacement for the sample located at (i,j) of the one or more samples, and g _y (i,j) is the ( is the vertical gradient for the sample located at i,j), and Δv _y (i,j) is the vertical gradient for the sample located at (i,j) among the one or more samples 8. The method of claim 7 , wherein said rounded vertical displacement.

said prediction block is a first prediction block, said current block is a first current block, said horizontal and vertical displacements are first horizontal and vertical displacements, said one or more wherein the refinement offset is the first one or more refinement offsets, the rounded horizontal and vertical displacements are the first rounded horizontal and vertical displacements, and the modified prediction block is the first A modified prediction block, the method comprising:
determining a second prediction block for inter-predicting the second current block;
determining second horizontal and vertical displacements for gradient-based prediction refinement of one or more samples of the second prediction block;
rounding the second horizontal and vertical displacements to the same level of precision to which the first horizontal and vertical displacements were rounded to produce a second rounded horizontal and vertical displacement;
determining a second one or more refinement offsets based on the second rounded horizontal and vertical displacements;
modifying the one or more samples of the second predictive block based on the determined second one or more refinement offsets to generate a second modified predictive block; ,
and reconstructing the second current block based on the second modified prediction block.

A device for coding video data, comprising:
means for determining a prediction block for inter-predicting a current block;
means for determining horizontal and vertical displacements for gradient-based prediction refinement of one or more samples of the prediction block;
means for rounding the horizontal and vertical displacements to an accuracy level that is the same for different inter-prediction modes;
means for determining one or more refinement offsets based on said rounded horizontal and vertical displacements;
means for modifying the one or more samples of the prediction block based on the determined one or more refinement offsets to produce a modified prediction block;
and means for coding said current block based on said modified prediction block.

11. The device of claim 10 , further comprising means for performing the method of any one of claims 2-9 .