Abstract: An image encoding/decoding method and device according to the present disclosure can determine an intra-prediction mode of the current block on the basis of whether the intra-prediction mode of the current block is derived on the basis of the gradient between at least two samples in the surrounding region adjacent to the current block, determine a reference sample of the current block, and generate a prediction sample of the current block on the basis of the intra-prediction mode and the reference sample.

Abstract: An image encoding/decoding method and device according to the present disclosure can induce an intra-prediction mode of the current block on the basis of an induction mode, determine a reference sample of the current block, and generate a prediction sample of the current block on the basis of the intra-prediction mode and the reference sample.

Abstract: An image decoding method according to the present document may comprise a step for deriving modified transform coefficients, wherein the step for deriving modified transform coefficients may comprise the steps of: determining whether the tree type of the current block is a single tree; parsing an LFNST index when the tree type is the single type, the LFNST index being parsed on the basis of a transform coefficient coding flag value for a luma component of the current block, or on the basis of whether an ISP mode is applicable to the luma component; and deriving the modified transform coefficients by applying an LFNST kernel derived on the basis of the LFNST index.

Abstract: An image encoding/decoding method and device according to the present disclosure enable: a motion vector of the current block to be derived on the basis of a merge inter mode; first and second prediction blocks of the current block to be respectively generated on the basis of first and second motion vectors; and a prediction block of the current block to be generated on the basis of the first prediction block and/or the second prediction block. Here, the motion vector of the current block comprises a first motion vector in a first direction and a second motion vector in a second direction, wherein the first motion vector is derived on the basis of a first inter prediction mode and the second motion vector can be derived on the basis of a second inter prediction mode.

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: An image encoding/decoding method and device according to the present disclosure may: partition a current block into a plurality of subregions; derive a control point vector of a current subregion among the plurality of subregions; derive a motion vector of the current subregion on the basis of the control point vector; and generate a prediction sample of the current block on the basis of the motion vector of the current subregion.

Abstract: An image decoding/encoding method and apparatus according to the present disclosure may: generate a candidate list for predicting a first motion vector of a current block; derive a control point vector of the current block on the basis of a candidate index of the current block and the candidate list; correct the control point vector of the current block on the basis of a predetermined delta motion vector; derive the first motion vector of the current block on the basis of the corrected control point vector; and perform inter prediction on the current block by using the first motion vector of the current block.

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 the decoding apparatus according to this document comprising deriving a temporary reference motion vector for a current block based on a reference candidate block of the current block, deriving a reference motion vector by compressing the temporary reference motion vector based on a shifting operation, deriving a motion vector for the current block based on the reference motion vector, deriving prediction samples for the current block based on the motion vector for the current block, and generating reconstructed samples for the current block based on the prediction samples for the current block, wherein a total number of bits of the binary code representing the reference motion vector is less than a total number of bits of the binary code representing the temporary reference motion vector.

Abstract: According to the present disclosure of the present document, prediction can be performed on the basis of information related to the maximum number of block vector candidates included in a merge candidate list for the IBC merge mode, and thus information for IBC, which is distinguished from information used in inter prediction, can be signaled separately, and the efficiency of screen content coding (SCC) can be increased.

Abstract: An image decoding/encoding method and device disclosed herein can: generate a first prediction block of the current block on the basis of a first prediction mode; generate a second prediction block of the current block on the basis of a second prediction mode; determine weights used for the current block on the basis of a weight candidate list including a plurality of pre-defined weight candidates; generate a third prediction block of the current block through the weighted summation of the first prediction block and the second prediction block; and decode/encode the current block on the basis of the third prediction block of the current block.

Abstract: An image decoding/encoding method and apparatus, according to the present disclosure, may comprise: deriving an intra-prediction mode of a current block on the basis of a gradient between at least two samples in a peripheral region adjacent to the current block; configuring a reference sample of the current block; and generating a prediction block of the current block on the basis of the intra-prediction mode and the reference sample.

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

Abstract: According to an embodiment disclosed in the present specification, a history-based motion vector prediction (HMVP) candidate set with respect to a current block may be derived based on a history, the HMVP candidate set may be updated or initialized according to a condition, and motion information of the current block may be derived based on the HMVP candidate set, through which inter prediction efficiency can be improved.

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

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: A method by which a decoding device performs image decoding, according to the present document, comprises the steps of: deriving a reference block on the basis of a motion shift; determining whether a subblock temporal motion vector predictor (sbTMVP) candidate is available, on the basis of whether the reference block is a current picture referencing (CPR) block; deriving motion information about a current block on the basis of the sbTMVP candidate when the sbTMVP candidate is available; generating prediction samples on the basis of the motion information; and generating a restored picture on the basis of the prediction samples, wherein the sbTMVP candidate is determined to be unavailable with respect to the reference block which is the CPR block.

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.