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.

Abstract: The present disclosure provides a method for decoding an image, and the method comprises partitioning a current block into a first partition and a second partition according to a split boundary, determining whether an intra block copy mode is applied to the first partition, determining a block vector of the first partition representing a reference block within a block vector search range of the current block when the intra block copy mode is applied to the first partition, determining a reference block referred to by the first partition based on the block vector, and predicting the first partition based on the reference block.

Abstract: A method and an apparatus for mesh compression utilizing octree-based trisoup coding includes encoding vertices of a mesh by using octree-based trisoup coding to increase coding efficiency for a three-dimensional mesh. The encoding/decoding method and the apparatus encode attribute information based on the information used in the trisoup coding to compress/reconstruct the three-dimensional mesh.

Abstract: A method, performed by a digital device, for processing an image service according to the present document comprises the steps of: receiving image information; decoding a first image on the basis of the image information; processing the decoded first image to be displayed on a first area of a display screen; and processing a second image to be displayed on a second area of the display screen.

Abstract: A method and an apparatus for video coding use an intra sub-partitions prediction and a transform skip. An image decoding device divides a current block into subblocks and determines whether to apply transform skip is to the subblocks of the current block. When the transform skip is used, the image decoding device omits the inverse transform for the subblocks. When the transform skip is not used, the image decoding device determines a transform kernel for the subblocks and inversely transforms the subblocks by using the determined transform kernel.

Abstract: A method and an apparatus are disclosed for video coding using mixed cross-component prediction. In the disclosed embodiments, a video decoding device generates a linear model (LM) prediction block of a current chroma block by performing cross-component prediction according to an LM mode, and generates a non-LM prediction block of the current chroma block by performing prediction according to a non-LM mode. The video decoding device generates a final chroma prediction block of the current chroma block by combining the LM prediction block and the non-LM prediction block based on weights.

Abstract: A method and an apparatus for video coding using a template matching-based inter prediction. A video decoding device decodes a merge index of the current block and generates a motion vector candidate list that includes a preset number of motion vector candidates. The video decoding device performs an initial motion refinement on the motion vector candidates and reorders the motion vector candidates. The video decoding device selects motion information of the current block from the motion vector candidates by using the merge index and generates a prediction block of the current block by using a selected motion information. In performing the initial motion refinement or reordering the motion vector candidates comprises by using a template matching, the video decoding device applies filtering to block partition boundaries within a template region of the current block.

Abstract: A method and an apparatus are disclosed for a video coding using an adaptive reference line candidate list. In the disclosed embodiments, a video decoding device decodes, from a bitstream, an intra-prediction mode of the current block and a multiple reference line index (MRL index). The video decoding device obtains a length of the MRL candidate list that indicates a number of reference lines included in the MRL candidate list, and obtains at least one or more filling methods. The video decoding device generates the MRL candidate list by adding reference lines corresponding to the length of the MRL candidate list to the MRL candidate list by using the at least one or more filling methods. The video decoding device derives the reference line from the MRL candidate list by using the MRL index, and generates, by using the reference line, a prediction block of the current block according to the intra-prediction mode.

Abstract: A method is disclosed for camera parameter grouping and updating for MPEG immersive video. In the disclosed embodiments, an immersive video decoding device decodes the number of camera view points, the number of scenes, the number of time steps, and the number of sensors. The immersive video decoding device decodes, based on the number of camera view points, camera explicit parameters and camera implicit parameters of each scene, camera explicit and implicit parameters of each time step, and camera explicit and implicit parameters of each sensor. The immersive video decoding device extracts a view port by using camera parameters appropriate for each sensor.

Abstract: A method and apparatus for video coding use implicit arbitrary block partitioning and prediction according to the implicit arbitrary block partitioning. The video coding method and the apparatus implicitly determine partitioned regions of a current block based on information on previously reconstructed neighboring reference regions. The video coding method and the apparatus generate predicted signals of the partitioned regions to improve video coding efficiency and to enhance video quality.