Abstract: This disclosure relates to signaling, parsing, and using adaptive resolution for motion vector difference in video coding. An example method includes receiving a video bitstream and extracting an inter-prediction syntax element from the video bitstream. The inter-prediction syntax element indicates which single-reference inter-prediction mode is enabled for one or more video blocks of the video bitstream. The method further includes determining whether an adaptive motion vector difference (MVD) mode is enabled for the one or more video blocks. The adaptive MVD mode is a single-reference inter-prediction mode with an adaptive MVD pixel resolution. When the adaptive MVD mode is enabled for the one or more video blocks, the method includes selecting a current MVD pixel resolution from a set of available MVD pixel resolutions. The method also includes decoding the one or more video blocks based on the current MVD pixel resolution.

Abstract: An example method of decoding an encoded video bitstream using at least one processor includes obtaining an encoded video bitstream, the encoded video bitstream including encoded color components. The method also includes entropy parsing the encoded color components and dequantizing the color components and obtaining transform coefficients of the color components. The method further includes applying a joint components secondary transform (JCST) on the transform coefficients of the color components, thereby generating JCST outputs. The method also includes performing a backward transform on the JCST outputs, thereby obtaining residual components of the color components; and decoding the encoded video bitstream based on the residual components of the color components.

Abstract: Described is picture segmentation through columns and slices in video encoding and decoding. A video picture is divided into a plurality of columns, each column covering only a part of the video picture in a horizontal dimension. All coded tree blocks (“CTBs”) belonging to a slice may belong to one or more columns. The columns may be used to break the same or different prediction or in-loop filtering mechanisms of the video coding, and the CTB scan order used for encoding and/or decoding may be local to a column. Column widths may be indicated in a parameter set and/or may be adjusted at the slice level. At the decoder, column width may be parsed from the bitstream, and slice decoding may occur in one or more columns.

Abstract: Disclosed is a method for video encoding and decoding using adaptive color transform on a residual signal. In particular, the maximum memory size required for adaptive color transform is limited by: controlling whether to allow color space conversion on a sequence level according to a syntax element indicating the maximum conversion size allowed for a sequence of pictures; or controlling whether to apply color space conversion on a block level according to the size of a coding block.

Abstract: An apparatus and system are provided to enable the co-existence of small data transmission (SDT) and core network (CN) buffering when a user equipment (UE) is in an inactive state. A message transmitted from a user plane function (UPF) includes a Quality of Service (QoS) Flow Indicator (QFI) and data volume information (DVI) of buffered data in the UPF while the UE is in the inactive state. The QFI and DVI is provided to a next generation radio access network (NG-RAN). Based on the QFI and DVI, the RAN determines whether to page the UE for a mobile terminated SDT (MT-SDT) and whether to trigger connection resumption due to SDT. If connection resumption is triggered, the NG-RAN keeps the UE in the inactive state while an SDT session is initiated. At the end of the SDT session, the NG-RAN re-activates CN buffering.

Abstract: Disclosed is a method for video encoding and decoding using adaptive color transform on a residual signal. In particular, the maximum memory size required for adaptive color transform is limited by: controlling whether to allow color space conversion on a sequence level according to a syntax element indicating the maximum conversion size allowed for a sequence of pictures; or controlling whether to apply color space conversion on a block level according to the size of a coding block.

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: An image decoding/encoding method and device according to the present disclosure enable: an intra prediction mode of the current block to be determined on the basis of whether the intra prediction mode of the current block is derived on the basis of a cost of a template area adjacent to the current block; a reference sample of the current block to be determined; and a prediction sample of the current block to be generated on the basis of the intra prediction mode and the reference sample.

Abstract: A method comprising: obtaining an image block unit comprising samples in color channels of one or two chrominance channels and one luminance channel (800); reconstructing samples of said luminance channels of the image block unit (802); predicting samples of at least one color channel of image block unit using a cross-component prediction model based on reconstructed samples on a reference channel, wherein parameters of the cross-component prediction model are determined at least partly based on a plurality of reconstructed chrominance samples and their corresponding reconstructed luminance samples in neighboring image block units (804); predicting a plurality of color channel samples in said neighboring image block units co-locating at least part of the reconstructed chrominance and luminance samples using said cross-component prediction model (806); determining a difference between values of the predicted plurality of color channel samples in said neighboring image block and corresponding reconstructed colo

Abstract: Disclosed is a method for video encoding and decod-ing using adaptive color transform on a residual signal. In particular, the maximum memory size required for adaptive color transform is limited by: controlling whether to allow color space conversion on a sequence level according to a syntax element indicating the maximum conversion size allowed for a sequence of pictures; or controlling whether to apply color space conversion on a block level according to the size of a coding block.

Abstract: Disclosed is a method for video encoding and decoding using adaptive color transform on a residual signal. In particular, the maximum memory size required for adaptive color transform is limited by: controlling whether to allow color space conversion on a sequence level according to a syntax element indicating the maximum conversion size allowed for a sequence of pictures; or controlling whether to apply color space conversion on a block level according to the size of a coding block.

Abstract: More suitable image encoding technique and image decoding technique are provided. An image encoding method for encoding an image includes: a predicted image generation step of generating a predicted image of a synthesis prediction by performing synthesis processing of synthesizing a predicted image of an inter prediction and a predicted image of an intra prediction to an encoding-target block; and an encoding step of encoding a difference between the predicted image generated in the predicted image generation step and a pixel value of an image of the encoding-target block, the synthesizing processing includes weighting processing performed to the predicted image of the inter prediction and the predicted image of the intra prediction, and a weighting parameter of the weighting processing is determined in accordance with a type of the intra prediction.

Abstract: More suitable image encoding technique and image decoding technique are provided. An image encoding method for encoding an image includes: a predicted image generation step of generating a predicted image of a synthesis prediction by performing synthesis processing of synthesizing a predicted image of an inter prediction and a predicted image of an intra prediction to an encoding-target block; and an encoding step of encoding a difference between the predicted image generated in the predicted image generation step and a pixel value of an image of the encoding-target block, the synthesizing processing includes weighting processing performed to the predicted image of the inter prediction and the predicted image of the intra prediction, and a weighting parameter of the weighting processing is determined in accordance with a type of the intra prediction.

Abstract: A method of video encoding includes determining whether a current block in a picture satisfies a size requirement. When the current block is determined to satisfy the size requirement, the method includes predicting an intra block copy (IBC) prediction mode usage flag of the current block based on a type of a tile group or a slice to which the current block belongs, determining an IBC prediction mode that is separate from an inter prediction mode and an intra prediction mode based on the inferred IBC prediction mode usage flag, determining a block vector indicating a reference area in the picture when the IBC prediction mode is determined, and encoding the current block based on reference samples in the reference area in the picture.

Abstract: A picture prediction method, encoder, decoder and storage medium are provided. If a current block uses an MIP mode to determine its intra prediction value, the encoder sets a value of an MIP mode parameter as indicating use of the MIP mode and signals into a bitstream; determines the MIP mode of the current block and signals into the bitstream; determines, based on the MIP mode, prediction values for luma and chroma components of the current block. The decoder parses the bitstream and determines an MIP mode parameter of the current block; if its value indicates that the current block uses the MIP mode to determine its intra prediction value, parses the bitstream, determines the MIP mode of the current block and prediction values of luma and chroma components of the current block based on the MIP mode; decodes the current block based on prediction values.

Abstract: An image encoding/decoding method and apparatus are provided. The image decoding method includes obtaining, from a bitstream, network abstraction layer (NAL) unit type information of at least one NAL unit including coded image data, determining a NAL unit type of at least one slice in the current picture based on the obtained NAL unit type information, and decoding the at least one slice based on the determined NAL unit type. The current picture includes a plurality of subpictures having different NAL unit types, the bitstream is a single bitstream obtained by merging a plurality of subpicture bitstreams for the subpictures.

Abstract: A video decoder may be configured to receive a first instance of a flag for a first block, with a first value for the flag indicating that a cross-component prediction (CCP) mode is derived without signaling and a second value for the flag indicating that the CCP mode is signaled; in response to determining that the first instance of the flag is set to the first value, derive a first CCP mode for the first block; determine a first predicted chroma block for the first block using the first CCP mode; determine a decoded version of the first block based on the first predicted chroma block; and output a picture of decoded video data that includes the decoded version of the first block.

Abstract: Methods, apparatuses, and non-transitory computer-readable storage mediums are provided for video decoding. In one method, a decoder determines a fusion scheme applied in decoder-side intra mode derivation (DIMD) mode and in template-based intra mode derivation (TIMD) mode, and the fusion scheme is applied as a weighted average of predictors in the DIMD mode and in the TIMD mode.

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: An example method of decoding video includes receiving a coded video bitstream comprising a plurality of frames, including a current frame comprising a current block. The method also includes determining whether a first prediction mode is applied to the current block. When the first prediction mode is applied to the current block: obtaining a first motion vector difference (MVD) for the current block by parsing the coded video bitstream; and deriving a second MVD for the current block based on the first MVD. The method further includes obtaining one or more motion vector predictors (MVP) for the current block, generating a motion vector (MV) pair that includes a first MV generated by adding the first MVD to the MVP and a second MV generated by adding the second MVD to the MVP, and decoding the current block using the MV pair.