Method and device for processing video signal on basis of inter-prediction
The present invention provides a method of processing a video signal based on inter prediction, the method comprises constructing a merge list based on a neighboring block of a current block; adding a history-based merge candidate representing motion information of a previously coded block of the current block to the merge list; obtaining a merge index indicating a merge candidate used for inter prediction of the current block within the merge list; generating a prediction block of the current block based on motion information of the merge candidate indicated by the merge index; and adding a residual block of the current block to the prediction block to reconstruct the current block, wherein when the history-based merge candidate has motion information that is not redundant with a pre-defined merge candidate among merge candidates included in the merge list, the history-based merge candidate is added to the merge list.
1. A method of decoding a video signal by an apparatus, the method comprising:
configuring an affine candidate list including an affine history-based motion vector prediction (HMVP) candidate;
deriving a control point motion vector predictor of a current block based on the affine HMVP candidate;
deriving a control point motion vector of the current block by adding a control point motion vector difference to the control point motion vector predictor;
obtaining a prediction block of the current block based on the control point motion vector of the current block; and
reconstructing the current block based on the prediction block,
wherein the method further comprises
adding non-adjacent spatial neighbor blocks to the affine candidate list,
wherein the non-adjacent spatial neighbor blocks are determined based on distances to the current block, and
wherein the control point motion vector of the current block is derived based on the non-adjacent spatial neighbor blocks.
2. The method of claim 1 ,
wherein the non-adjacent spatial neighbor blocks are located at a specific distance from left and above sides of the current block.
3. The method of claim 1 ,
wherein the non-adjacent spatial neighbor blocks are located at a predefined pixel distance from left and above sides of the current block.
4. The method of claim 1 ,
wherein the affine candidate list includes at least of an affine merge candidate list or an affine advanced motion vector prediction (AMVP) candidate list.
5. A method of encoding a video signal by an apparatus, the method comprising:
configuring an affine candidate list including an affine history-based motion vector prediction (HMVP) candidate;
deriving a control point motion vector predictor of a current block based on the affine HMVP candidate;
deriving a control point motion vector of the current block by adding a control point motion vector difference to the control point motion vector predictor;
generating prediction samples of the current block based on the control point motion vector of the current block; and
generating residual samples of the current block based on the prediction samples,
wherein the method further comprises
adding non-adjacent spatial neighbor blocks to the affine candidate list,
wherein the non-adjacent spatial neighbor blocks are determined based on distances to the current block, and
wherein the control point motion vector of the current block is derived based on the non-adjacent spatial neighbor blocks.
6. A non-transitory decoder-readable storage medium storing encoded picture information generated by performing the steps of:
configuring an affine candidate list including an affine history-based motion vector prediction (HMVP) candidate;
deriving a control point motion vector predictor of the current block based on the affine HMVP candidate;
deriving a control point motion vector of the current block by adding a control point motion vector difference to the control point motion vector predictor;
generating prediction samples of the current block based on the control point motion vector of the current block; and
generating residual samples of the current block based on the prediction samples,
wherein the step of configuring the affine candidate list further comprises
adding non-adjacent spatial neighbor blocks to the affine candidate list,
wherein the non-adjacent spatial neighbor blocks are determined based on distances to the current block, and
wherein the control point motion vector of the current block is derived based on the non-adjacent spatial neighbor blocks.