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.

Abstract: A LiDAR point cloud coding method includes determining, from LiDAR information, a coding block that is a point cloud encoding/decoding unit, to improve the LiDAR point cloud coding efficiency. The LiDAR point cloud coding method also includes encoding/decoding points on a per coding block basis.

Abstract: A video decoding method performed by a decoding apparatus according to the present document comprises the steps of: receiving a bit stream including residual information of a current block; deriving a specific number of the number of context encoding bins for context syntax elements for a current sub-block of the current block; decoding the context syntax elements for the current sub-block included in the residual information on the basis of the specific number; deriving transform coefficients for the current sub-block on the basis of the decoded context syntax elements; deriving residual samples for the current block on the basis of the transform coefficients; and generating a reconstructed picture on the basis of the residual samples.

Abstract: A method for video coding uses various block partitioning structures. A method performed by a video decoding apparatus includes decoding, from a bitstream, a width and a height of the current block, and a split flag indicating whether the current block is to be partitioned. The method also includes checking for a value of the split flag. If the split flag is false, the method further includes checking whether the aspect ratio satisfies a preset first condition and whether the width and the height satisfy a preset second condition. If the aspect ratio satisfies the first condition and if the width and the height satisfy the second condition, the method further includes decoding from the bitstream a sequential split flag indicating an application of a sequential quad-tree structure. If the sequential split flag is true, the method further includes partitioning the current block into lower blocks by using the sequential quad-tree structure.

Abstract: A method and an apparatus are disclosed for video coding that adaptively determine a blending region in a geometric partitioning mode. In the disclosed embodiments, a video decoding device decodes a geometric partitioning mode of the current block and partitions the current block into a first subregion and a second subregion centered on a geometric split boundary according to the geometric partitioning mode. The video decoding device generates first predicted signals for the first subregion and second predicted signals for the second subregion. The video decoding device determines a final blending region for weight summing the first predicted signals and the second predicted signals. The video decoding device determines a blending matrix and generates final predicted signals of the current block by weight summing the first predicted signals and the second predicted signals in the final blending region by using the blending matrix.

Abstract: A method and an apparatus are disclosed for video coding using an improved in-loop filter. The video coding method and the apparatus generate a residual frame from a reconstructed frame using a deep learning model. The video coding method and the apparatus improve performance of an in-loop filter by approximating an original residual frame by applying the generated residual frame to a linear model.

Abstract: A method and an apparatus are disclosed for video coding using an improved inloop filter for chroma components. In the disclosed embodiments, a video decoding device performs obtaining a reconstructed frame that includes luma samples and chroma samples, subsequently obtaining a scale value representing a resolution difference between the reconstructed frame and an original frame. Responsive to the reconstructed frame having a resolution that is based on the scale value and is less than a resolution of the original frame, the video decoding device generates an upsampled chroma frame by inputting the luma samples and the chroma samples into a cross component resampling inloop filter (CC-RIF).

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may include parsing, from a bitstream, first information specifying whether block difference pulse code modulation (BDPCM) applies to an intra-predicted current block, determining a prediction direction of BDPCM for the current block and generating a residual block of the current block based on the determined prediction direction of BDPCM, based on the first information specifying that BDPCM applies to the current block, generating a prediction block of the current block, by performing intra prediction based on an intra prediction mode of the current block, and reconstructing the current block based on the residual block and the prediction block.

Abstract: An image decoding method is disclosed. The image decoding method includes obtaining intra prediction mode information of a current block from a bitstream, determining an intra prediction mode of the current block based on the intra prediction mode information and an intra prediction mode of a neighboring block located around the current block, deriving a value of a first filter flag for use of filtering of an intra prediction reference sample of the current block based on coding parameters for the current block, selecting an interpolation filter to be used for intra prediction of the current block based on the first filter flag, and generating an intra prediction block of the current block using the selected interpolation filter.

Abstract: A method and an apparatus are disclosed for video coding using an affine model-based prediction. In the disclosed embodiments, a video decoding device decodes, from a bitstream, all or part of affine model information, control point motion vector information, and a reference picture index. The video decoding device determines the form of the affine model based on the affine model information, and derives control point motion vectors based on the affine model and the control point motion vector information. The video decoding device generates a motion vector for each prediction unit of the current block by using the control point motion vectors, and generates a prediction block of the current block by generating prediction values for each prediction unit of the current block by using the motion vector and a reference picture indicated by the reference picture index.

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 comprises generating a first reference sample based on a first reference area neighboring a current block, generating a second reference sample based on a second reference area neighboring the current block, and performing intra prediction based on the current block based on the first reference sample and the second reference sample. The first reference area may be a reconstructed area located the left, top and top-left of the current block, and the second reference area may be a predicted area located at the right, bottom and bottom-right of the current block.

Abstract: A method and an apparatus for video coding using a super-resolution in-loop filter utilize an in-loop filter based on upsampling or super-resolution techniques in processing a video signal through downsampling to the compression and upsampling to the reconstruction thereof. The video decoding method includes obtaining the reconstructed frame, obtaining a scale value representing a resolution difference between the reconstructed frame and the original frame, generating, based on the scale value, an upsampled reconstructed frame by inputting the reconstructed frame into a resampling in-loop filter that is deep learning-based, and storing an output frame as a reference frame once generated by the plurality of filters and the resampling in-loop filter in a decoded picture buffer (DPB).

Abstract: An image decoding method performed by a decoding device according to the present document comprises the steps of: deriving an intra prediction type for a current block from among intra prediction types; constituting an intra prediction mode candidate list of the current block on the basis of intra prediction modes of neighboring blocks of the current block; deriving an intra prediction mode of the current block on the basis of the intra prediction mode candidate list; and generating prediction samples of the current block on the basis of the intra prediction type and the intra prediction mode.