Abstract: A method for decoding a video includes determining, from multiple sets of multiple transform selection candidates, one set of multiple transform selection candidates based on at least one of a number of non-zero coefficients in a current block and a position of a last non-zero coefficient in the current block. The method for decoding the video also includes selecting one inverse transform method based on the one set of multiple transform selection candidates. The method for decoding the video further includes generating a residual block of the current block by performing the one inverse transform method on coefficients of the current block, where the multiple sets of multiple transform selection candidates have one or more candidates that correspond to a non-Discrete Cosine Transform 2 (non-DCT 2) inverse transform method.

Abstract: A method of decoding a motion vector of a current block by a video decoding device includes decoding, from a bitstream, a candidate index of a motion vector predictor of the current block, wherein the candidate index indicates one of motion vector predictors in a candidate list that includes at least one of a spatial candidate, a temporal candidate, a history-based candidate, or an object-based-candidate; generating the candidate list; and deriving the motion vector predictor of the current block from the candidate list by using the candidate index. Generating the candidate list includes: obtaining an object index of the current block; determining, in a reference picture, a reference object having an object index equal to the object index of the current block; deriving a matching area in the reference picture based on a region of the reference object; and generating the object-based-candidate.

Abstract: A method and an apparatus are disclosed for video coding using inter/intra prediction based on a geometric partition. A video decoding device decodes, from a bitstream, geometric partition information of the current block, and partitions the current block into multiple sub-regions according to the geometric partition information. The video decoding device parses an index of each of the multiple sub-regions, and the index indicates a prediction mode of each sub-region. The video decoding device generates, based on a value of the index, a predictor for each of the sub-regions by using inter-prediction, intra-prediction, or template matching. The video decoding device generates a final predictor of the current block by weighted-summing predictors of the multiple sub-regions.

Abstract: A method is disclosed for composing a MPM list in intra prediction. A video coding method and an apparatus derive intra-prediction modes for neighboring blocks that are non-usable for composing a Most Probable Mode list (MPM list) to organize the derived intra-prediction modes into an MPM list. The video coding method and the apparatus organize, based on history-based MPM list composition, the intra-prediction modes of non-adjacent blocks into a MPM list.

Abstract: A method is disclosed for modifying a decoder-side motion vector list in inter prediction. A video coding method and an apparatus use a template matching method or a bilateral matching (BM) method in a merge mode and an advanced motion vector prediction (AMVP) mode of inter prediction. The video coding method and the apparatus perform at least one of adding, pruning, or reordering candidates with respect to a motion vector list at the decoder side.

Abstract: According to an embodiment of the present invention provides a method for decoding an image, which includes determining a first prediction block of a current block according to intra template matching mode, determining a second prediction block of the current block according to intra block copy mode, and determining a final prediction block of the current block based on a weighted sum of the first prediction block and the second prediction block.

Abstract: An image decoding method may comprise determining a prediction mode of a current block as an affine intra prediction mode, determining a control point block vector of the current block, determining block vectors of sub-blocks of the current block based on the control point block vector of the current bloc, and predicting the current block using reference blocks of a current picture indicated by the block vectors of the sub-blocks.

Abstract: According to an embodiment of the present invention, a method for decoding an image is provided including deriving a first quantization index, deriving a second quantization index by shifting the first quantization index, deriving a first reconstructed transformed coefficient and a second reconstructed transformed coefficient by performing dequantization on the first quantization index and the second quantization index respectively, and generating final reconstructed transformed coefficients by applying a first weight and a second weight to the first reconstructed transformed coefficient and the second reconstructed transformed coefficient respectively.

Abstract: A method by which a decoding device decodes an image, according to the present document, comprises the steps of: acquiring residual information about the current block; deriving residual samples of the current block on the basis of the residual information; and generating a reconstructed picture on the basis of the residual samples.

Abstract: Provided are an image encoding/decoding method and apparatus, a recording medium for storing a bitstream and a transmission method. The image decoding method may comprise deriving an initial block vector of a current block, deriving a search range based on the initial block vector, and deriving a refined block vector based on the search range. The refined block vector is derived based on a difference between a first prediction signal generated from a candidate block vector within the search range and a second prediction signal generated based on an intra prediction mode of the current block.

Abstract: A method and an apparatus are disclosed for video coding utilizing a template matching prediction method based on intra mode information. In the disclosed embodiments, the video decoding device searches for a matching block based on a template matching between templates of reference blocks in a search region and a template of the current block and determines a prediction block of the current block by a searched matching block. The video decoding device decodes a template matching filter flag that indicates whether filtering is to be applied to the prediction block based on the template matching. By checking the template matching filter flag, and when the template matching filter flag is true, the video decoding device determines a shape of a filter by using intra mode information of the current block and applies the filtering to the prediction block by using the filter.

Abstract: A method and apparatus for video coding utilize a template matching-based secondary MPM list. The video coding method and the apparatus generate a secondary most probable mode (MPM) list according to a gradient-based template matching result and utilize the secondary MPM list for intra prediction of the current block for improving video coding efficiency and enhancing video quality.

Abstract: A method and an apparatus for encoding/decoding a video are provided. A method for decoding a video according to the present disclosure includes determining whether to apply a combined inter/intra prediction (CIIP) mode or a geometric partitioning mode. The method for decoding the video also includes deriving a motion vector from a merge candidate list. The method for decoding the video also includes correcting the motion vector by using motion vector difference information. The method for decoding the video also includes generating a prediction block of a current block based on a corrected motion vector.

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus includes determining a splitting type of a current block, splitting the current block into a plurality of lower-layer blocks based on the splitting type, and decoding the lower-layer blocks. In this case, the current block may be a chroma block, and the determining the splitting type of the current block may be performed by disallowing a predetermined splitting type having a width or height of the lower-layer blocks being a predetermined value, among a plurality of splitting types.

Abstract: A method and apparatus for encoding/decoding an image, a recording medium for storing a bitstream, and a transmission method are provided. The method for decoding an image comprises determining whether a current block is in intra template matching mode, determining a template shape of the current block among a plurality of template shape candidates, searching for a reference template based on a current template according to the template shape, and generating a prediction block of the current block based on the reference template.

Abstract: A method and an apparatus for encoding/decoding an image, a recording medium for storing a bitstream, and a transmission method are provided. The method for decoding an image includes determining a transform type of a current block, determining a coefficient sign prediction target based on the transform type, and predicting a sign of a coefficient corresponding to the coefficient sign prediction target, and the coefficient sign prediction target may be specified as a coefficient sign prediction area or the number of coefficients corresponding to the coefficient sign prediction target.

Abstract: A method for decoding a picture performed by a decoding apparatus according to the present disclosure includes receiving a bitstream including residual information, deriving a quantized transform coefficient for a current block based on the residual information included in the bitstream, deriving a transform coefficient from the quantized transform coefficient based on a dequantization process, deriving a residual sample for the current block by applying an inverse transform to the derived transform coefficient, and generating a reconstructed picture based on the residual sample for the current block.

Abstract: A method and a device for encoding/decoding a video are provided. A method for decoding a video according to the present disclosure includes generating an inter-prediction block of a current block based on a reference block corresponding to the current block and present in a reference picture. The method also includes generating an intra-prediction block of the current block based on at least one of at least one reference block adjacent to the current block, an intra-prediction mode list, a first region adjacent to the current block, a most probable mode (MPM) list of the current block, or reconstructed reference pixels adjacent to the current block. The method also includes generating a combined inter-intra prediction (CIIP) block of the current block by weighted averaging the inter-prediction block and the intra-prediction block.

Abstract: An image encoding/decoding method and apparatus, a recording medium for storing a bitstream and a transmission method are provided. The image decoding method may comprise determining an intra prediction mode of a current block, deriving an omni-directional reference sample, and performing intra prediction based on the omni-directional reference sample and the intra prediction mode. The omni-directional reference sample includes a first reference sample located at any one of a top, left, and top left of the current block and a second reference sample located at any one of a bottom, right, and bottom right of the current block.

Abstract: A method and apparatus for encoding/decoding an image, a recording medium for storing a bitstream, and a transmission method are provided. The method for decoding the image includes generating an inter prediction block of a current block, generating an intra prediction block of the current block, and generating a final prediction block of the current block by performing weighted summation of the inter prediction block and the intra prediction block, and the intra prediction block may be generated based on one of intra template matching prediction and intra block copy.