Abstract: According to embodiments of the present document, symmetric motion vector differences (SMVDs) and merge mode motion vector differences (MMVDs) according to an inter prediction mode may be performed on the basis of reference picture types and, particularly, short term reference pictures may be used. Therefore, prediction performance and coding efficiency in the inter prediction mode can be improved.

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure includes determining whether to use an advanced temporal motion vector predictor (ATMVP) candidate of sub-block unit for a current block, specifying a corresponding block corresponding to the current block in a reference picture based on a motion vector for a spatial neighboring block of the current block when the ATMVP candidate of the sub-block unit is used, deriving the ATMVP candidate of the sub-block unit for the current block based on motion vectors of sub-block unit of the corresponding block, constructing a merge candidate list including the ATMVP candidate of the sub-block unit for the current block, generating prediction samples of the current block by deriving motion vectors of the sub-block unit for the current block based on the merge candidate list and reconstructing a current picture based on the prediction samples of the current block.

Abstract: According to the disclosure of the present document, when the inter-prediction type of the current block indicates biprediction, weight index information for a candidate in a merge candidate list or sub-block merge candidate list can be derived, and coding efficiency can be raised.

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.

Abstract: According to the disclosure of this document, in subblock-based temporal motion vector prediction (sbTMVP), a subblock position for deriving a motion vector in units of a subblock can be efficiently calculated, and through this, video/image coding efficiency can be improved and hardware implementation can be simplified.

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: constructing an AMVP candidate list comprising at least one AMVP candidate for a current block; deriving an HMVP candidate list for the current block that includes HMVP candidates for the current block; selecting at least one HMVP candidate among the HMVP candidates in the HMVP candidate list; deriving an updated AMVP candidate list by adding the at least one HMVP candidate to the AMVP candidate list; deriving motion information for the current block on the basis of the updated AMVP candidate list; deriving prediction samples for the current block on the basis of the motion information for the current block; and generating reconstruction samples for the current block on the basis of the prediction samples for the current block.

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.

Abstract: An image decoding method according to the present disclosure includes deriving a history-based motion vector prediction (HMVP) buffer for a current block, deriving motion information of the current block based on an HMVP candidate included in the HMVP buffer, generating prediction samples for the current block based on the motion information, and generating reconstructed samples based on the prediction samples, and the HMVP buffer is initialized when processing a first-ordered CTU in a CTU row in which a current CTU is located, and the current block is included in the current CTU.

Abstract: An image decoding method according to the present document may comprise the steps of: deriving an inter prediction mode from encoded information; configuring reference picture lists, deriving motion information comprising reference picture indexes for symmetric motion vector differences (SMVD); and generating prediction samples on the basis of the motion information, wherein the reference picture indexes for SMVD can be derived on the basis of short-term reference pictures included within the reference picture lists.

Abstract: A decoding method carried out by a decoding device, according to the present document, comprises the steps of: acquiring, from a bitstream, information associated with a prediction mode of a current block; deriving a prediction mode of the current block on the basis of the information associated with the prediction mode; deriving prediction samples of the current block on the basis of the prediction mode; and generating reconstructed samples on the basis of the prediction samples, wherein the bitstream comprises a sequence parameter set, the sequence parameter set comprising a combined inter-picture merge and intra-picture prediction (CIIP) enable flag, and the step for deriving may comprise a step for parsing a regular merge flag from the bitstream on the basis of the satisfying of a condition based on the CIIP enable flag and a condition based on the size of the current block.

Abstract: A method and device for decoding video data are disclosed. More specifically, a method of decoding video data may comprise: configuring a block vector candidate list of a current block to which an intra block copy (IBC) prediction mode is applied, the IBC mode referring to another block in a current picture; and generating a prediction sample of the current block based on a block vector included in the block vector candidate list. Configuring the block vector candidate list comprises: configuring the block vector candidate list from a spatial neighboring block to which the IBC prediction mode is applied; and modifying the block vector candidate list based on an history-based motion vector prediction (HMVP) candidate to which the IBC prediction mode is applied when a number of current candidates of the block vector candidate list is smaller than a maximum candidate number.

Abstract: An image decoding method according to the present document includes obtaining motion prediction information for a current block from a bitstream, generating an affine MVP candidate list for the current block, deriving CPMVPs for CPs of the current block based on the affine MVP candidate list, deriving CPMVDs for the CPs of the current block based on the motion prediction information, deriving CPMVs for the CPs of the current block based on the CPMVPs and the CPMVDs, and deriving prediction samples for the current block based on the CPMVs.

Abstract: The present invention discloses a method for encoding/decoding a video signal and an apparatus for the method. More specifically, a method for decoding a video signal comprises generating a residual block of a current block by performing entropy decoding on the video signal; if size of the current block is smaller than a predetermined first size, parsing a transform skip flag which indicates whether a transform skip is applied to the current block; determining whether to parse a primary transform flag which indicates whether a primary transform is applied to the current block; if it is determined to parse the primary transform flag, parsing the primary transform flag; and if the primary transform flag indicates that a primary transform is applied to the current block, generating a primary inverse transformed transform block of the current block by performing a primary inverse transform to the residual block.

Abstract: Disclosed are an intra-prediction mode-based image processing method and a device therefor. Particularly, a method for processing an image on the basis of an intra-prediction mode may comprise the steps of: configuring a reference sample to be used for prediction of a current block on the basis of width information and height information of the current block when the current block is a non-square block; deriving an intra-prediction mode of the current block; and generating a prediction sample of the current block by using the reference sample on the basis of the intra-prediction mode of the current block.

Abstract: According to the disclosure of the present document, when the inter prediction type of a current block indicates biprediction, weight index information for candidates in a merge candidate list or a sub-block merge candidate list can be induced or derived, and coding efficiency can be increased.

Abstract: Disclosed are a method for encoding a video signal and a device therefor. Specifically, a method for decoding an image based on an inter prediction mode comprises: generating a merging candidate list by using a spatial merge candidate and a temporal merge candidate of a current block; obtaining a merge index indicating a certain merge candidate in the merging candidate list; and generating a prediction block of the current block by using motion information of the certain merge candidate, wherein the generating of the merging candidate list may include adding a first merge candidate indicating a collocated block specified by motion information of the spatial merge candidate to the merging candidate list if a reference picture of the spatial merge candidate is same as a predetermined picture.

Abstract: The present invention discloses an image coding/decoding method and an apparatus for the method. More specifically, a method for filtering an image by a decoding apparatus comprises deriving boundaries of a block divided into quad-tree plus binary-tree structure; determining an edge among boundaries of the block to which de-blocking filtering is applied; determining a type of de-blocking filtering to be applied to the edge; and performing de-blocking filtering to a picture sample restored according to the de-blocking filtering type, wherein the edge or the type of de-blocking filtering is determined by considering width or height of the block.

Abstract: An image decoding method includes: deriving an L0 motion vector and a L1 motion vector of the current block; deriving prediction samples of the current block based on the L0 motion vector and the L1 motion vector; and generating reconstructed samples of the current block based on the prediction samples. Deriving the prediction samples includes applying bi-directional optical flow (BDOF) to the current block based on whether the condition for applying BDOF to the current block is satisfied, and the application condition of the BDOF includes a condition whereby the values of L0 luma weighted prediction flag information and L1 luma weighted prediction flag information are both zero, where the a value of each of the L0 luma weighted prediction flag information and L1 luma weighted prediction flag information being 0 represents that a weight factor for each of a L0 and L1 prediction luma components does not exist, respectively.

Abstract: In the present disclosure, a method of decoding a video signal and a device therefor are disclosed. Specifically, a method of decoding an image based on an inter prediction mode includes deriving a motion vector of an available spatial neighboring block around a current block; deriving a collocated block of the current block based on the motion vector of the spatial neighboring block; deriving a motion vector in a sub-block unit in the current block based on a motion vector of the collocated block; and generating a prediction block of the current block using the motion vector derived in the sub-block unit, wherein the collocated block may be specified by the motion vector of the spatial neighboring block in one pre-defined reference picture.

Abstract: An image decoding method performed by a decoding apparatus according to the present document comprises the steps of: determining that a merge with motion vector difference (MMVD) mode has been applied to a current block that is a current picture referencing (CPR) coding block referring to a current picture; deriving a base motion information candidate for the current block on the basis of candidate blocks neighboring the current block; generating prediction samples for the current block on the basis of the base motion information candidate; and generating reconstruction samples for the current block on the basis of the prediction samples, wherein the base motion information candidate is derived depending on whether the neighboring candidate blocks are CPR coding blocks.