Abstract: The application relates to an intra block copy mode with dual tree partition. A method of video processing is disclosed. The method of video processing includes: determining, during a conversion between a current video block and a bitstream representation of the current video block, a block vector for the current video block; and performing, at least based on the block vector, the conversion, wherein when the current video block is coded with a coding mode using a reference block for prediction pointing to a same picture that the current video block is located in, and the current video block is a first type of block, the block vector is derived from at least one second type of block.

Abstract: A method for encoding at least one image, including subdividing the image into a plurality of blocks and subdividing at least one current block into a first portion and a second portion. The first portion has a rectangular or square shape and the second portion complements the first portion in the current block. The second portion has a geometric shape with m sides, wherein m>4. Then the first and second portions are encoded.

Abstract: A video decoding method performed by a video decoding apparatus, according to the present document, comprises the steps of: obtaining image information from a bitstream, wherein the image information includes a picture header associated with a current picture, and the current picture includes a plurality of slices; parsing at least one of a first flag and a second flag from the picture header; generating prediction samples by performing at least one of intra prediction and inter prediction on a current block in the current picture on the basis of at least one of the first flag and the second flag; generating reconstructed samples on the basis of the prediction samples; and generating a reconstructed picture on the basis of the reconstructed samples.

Abstract: A method for video processing is provided. The method includes determining, for a conversion between a current video block of a video that is a chroma block and a coded representation of the video, multiple sets of parameters, wherein each set of parameters defines a cross-component linear model (CCLM) and is derived from a corresponding group of chroma samples at corresponding chroma sample positions; determining, based on the multiple sets of parameters, parameters for a final CCLM; and performing the conversion based on the final CCLM.

Abstract: Provided is a video decoding method including: determining an inter prediction mode of a current block when the current block is inter-predicted; determining at least one reference sample location to be referred to by the current block, based on the inter prediction mode of the current block; determining filter information to be applied to at least one reconstructed reference sample corresponding to the at least one reference sample location, based on the inter prediction mode of the current block; performing filtering on the at least one reconstructed reference sample, based on the filter information; and decoding the current block by using prediction samples generated via the filtering.

Abstract: A video decoding apparatus includes matrix reference pixel derivation circuitry that derives reference samples by using top neighboring samples and left neighboring samples of a current block, weight matrix derivation circuitry that derives a weight matrix, matrix prediction image derivation circuitry that derives a prediction image, and matrix prediction image interpolation circuitry that derives a predicted image by using the prediction image. A size index is derived according to a value of a target block width and a value of a target block height. A prediction size is derived using the size index. In a case that a first condition, that both the value of the transform block width and the value of the transform block height are equal to 4, is true, the size index is set equal to 0 and the prediction size is set equal to 4.

Abstract: Disclosed herein are an immersive video decoding method and an immersive video encoding method. The immersive video decoding method includes partitioning a current picture into multiple main blocks, determining whether each main block is to be partitioned into multiple sub-blocks, and when it is determined that each main block is to be partitioned into multiple sub-blocks, determining a partitioning type of the corresponding main block. Here, the corresponding main block may be partitioned into four or two sub-blocks depending on the partitioning type. When the corresponding main block is partitioned into multiple sub-blocks, whether depth information is to be updated for each of the sub-blocks generated by partitioning the main block may be determined.

Abstract: A method of and an apparatus for controlling intra prediction for decoding of a video sequence are provided. The method includes determining a ratio of a width to a height of a coding unit, and based on the determined ratio being different than one, adding, to a table including intra prediction modes corresponding to intra prediction angles, first wide angles toward a bottom-left edge of the coding unit, second wide angles toward a top-right edge of the coding unit, and additional intra prediction modes respectively corresponding to the first wide angles and the second wide angles. The method further includes selecting, for decoding the video sequence, one of the intra prediction modes and the additional intra prediction modes added to the table.

Abstract: New intra planar modes are introduced for predicting digital video data. As part of the new intra planar modes, various methods are offered for predicting a first sample within a prediction unit, where the first sample is needed for referencing to when processing the new intra planar modes. And once the first sample is successfully predicted, the new intra planar modes are able to predict a sample of video data within the prediction unit by processing a bi-linear interpolation of four previously reconstructed reference samples.

Abstract: An image decoding method according to the present document comprises the steps of: deriving a quantized transform coefficient for a current block on the basis of BDPCM; deriving a transform coefficient by performing dequantization on the quantized transform coefficient; and deriving a residual sample on the basis of the transform coefficient, wherein, when the BDPCM is applied to the current block, inverse non-separable transform is not applied to the transform coefficient.

Abstract: Devices, systems and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes performing a first determination whether a luma video block of a video is coded using a matrix based intra prediction (MIP) mode; performing a second determination that the luma video block is applicable for determining a chroma intra mode for a current chroma video block of the video; performing, based on the first determination and the second determination, a third determination about the chroma intra mode to be used for the current chroma video block; and performing, based on the third determination, a conversion between the current chroma video block and a bitstream representation of the current chroma video block.

Abstract: A picture decoding method, performed by a decoding apparatus according to the present disclosure, comprises the steps of: when an intra-prediction mode of a chroma block is a cross-component linear model (CCLM) mode, deriving neighboring chroma reference samples with respect to the chroma block; deriving neighboring luma reference samples of a luma block corresponding to the chroma block and luma samples in the luma block; deriving down-sampled neighboring luma reference samples and downsampled luma samples by down sampling the neighboring luma reference samples and the luma samples, respectively; deriving a linear model parameter on the basis of the down-sampled neighboring luma reference samples and the neighboring chroma reference samples; generating prediction samples with respect to the chroma block on the basis of the linear model parameter and the down-sampled luma samples of the luma block; and reconstructing the chroma block on the basis of the prediction samples with respect to the chroma block.

Abstract: An information processing apparatus includes circuitry to: divide an image into a first block and a second block; encode the first block using fixed-length coding based on a determination that a first data size is equal to or greater than a threshold, the first data size being a data size for the first block in a case where the first block is encoded using variable-length coding; and encode the first block using variable-length coding based on a determination that the first data size is less than the threshold.

Abstract: An image decoding method performed by a decoding apparatus includes the operations of: deriving a correspondence block corresponding to the current block of the current picture, the correspondence block being located in a co-located picture; deriving a movement vector of the correspondence block; scaling the movement vector of the correspondence block based on a first temporal distance and second temporal distance, the first temporal distance being the difference between the POC values of the co-located picture and POC values of the reference picture of the correspondence block, and the second temporal distance being the difference between the POC values of the co-located picture and POC values of the current picture containing the current block; deriving the movement vector updated based on the scaled movement vector and location of the current block; and deriving a movement vector of the current block based on the updated movement vector.

Abstract: A method for video processing includes: refining motion vectors of a video block by using a motion refinement process; performing a prediction sample refinement for part of components of the video block using refined motion vectors of the video block; and performing a video processing on the video block based on the refined prediction sample.

Abstract: A method and apparatus for sub-picture based raster scanning coding order. The method includes dividing an image into even sub-pictures, and encoding parallel sub-pictures on multi-cores in raster scanning order within sub-pictures, wherein from core to core, coding of the sub-picture is independent around sub-picture boundaries, and wherein within a core, coding of a sub-picture is at least one of dependent or independent around sub-picture boundaries.

Abstract: A method and apparatus for signaling and receiving a video signal for processing is disclosed. Methods for determining a most probable mode for predicting a current prediction block are provided as well as new methods for grouping intra prediction modes into prediction groups. Methods for predicting a prediction block of video data as well as signaling intra prediction modes are also provided.

Abstract: This disclosure relates to a transform kernel sharing in video encoding and decoding. For example, a method is disclosed for such transform kernel sharing. The method may include identifying a plurality of transform kernels, wherein each of the plurality of transform kernels comprises a set of basis vectors from low to high frequencies; N high-frequency basis vectors of two or more of the plurality of transform kernels are shared, N being a positive integer; and low-frequency basis vectors of the two or more of the plurality of the transform kernels other than the N high-frequency basis vectors are individualized. The method may further include extracting a data block from a video bitstream; selecting a transform kernel from the plurality of transform kernels based on information associated with the data block; and applying the transform kernel to at least a portion of the data block to generate a transformed block.

Abstract: Embodiments of this application disclose bi-directional inter prediction methods and apparatuses. In an embodiment, a method comprises: determining that a first reference picture index of a first reference picture list is associated with a current block to be predicted; determining that a second reference picture index of a second reference picture list is associated with the current block; and predicting the current block based on the first reference picture index and the second reference picture index.

Abstract: In some embodiments, there is provided a system for remotely processing data streams including: at least one transmitter configured for transmission of at least two data streams, the at least two data streams including at least a lower quality preview stream and a higher quality content stream. A plurality of editor computing devices is configured for receiving at least the lower quality preview stream and facilitating processing and editing on the lower quality preview stream, generating a set of machine-readable instructions representative of the processing and editing. A plurality of routing computing devices located from the at least one transmitter is configured for receiving at least the higher quality content stream and the set of machine-readable instructions, processing the higher quality content stream by encoding the higher quality content stream based on the set of machine-readable instructions to generate an output content stream.

Abstract: A method of decoding JVET video includes receiving a bitstream that includes encoded video data that includes encoded video data. From the encoded data, a horizontal predictor and a vertical predictor for a pixel in the current coding block may be interpolated. A coding block size may be identified to determine whether to use equal weight or unequal weights to apply to each of the horizontal and vertical predictors for calculating a final planar prediction value P(x,y) by comparing the coding block size to a coding block size threshold.

Abstract: A method of decoding a video signal according to the present invention may include: determining whether or not change in brightness is present between a current video including a current block and a reference video of the current video; when it is determined that change in brightness is present between the current video and the reference video, determining weight prediction parameter candidates of the current block; determining a weight prediction parameter of the current block on the basis of index information specifying any of the weight prediction parameter candidates; and performing prediction for the current block on the basis of the weight prediction parameter.

Abstract: An image encoding method can include determining an intra prediction mode of a current prediction unit; constructing a mode group including three intra prediction modes using valid intra prediction modes of left and top blocks of the current prediction unit; determining a mode group indicator and a prediction mode index of the current prediction unit; and encoding the mode group indicator and the prediction mode index, in which the mode group indicator indicates whether or not the intra prediction mode of the current prediction unit belongs to the mode group, when the mode group indicator indicates that the intra prediction mode of the current prediction unit belongs to the mode group, the prediction mode index specifies the intra prediction mode of the current prediction unit in the mode group, when the mode group indicator indicates that the intra prediction mode of the current prediction unit does not belong to the mode group, the prediction mode index specifies the intra prediction mode of the current pre

Abstract: At least a method and an apparatus are presented for encoding or decoding video and can involve, for example, obtaining a group of coding units including two or more of a plurality of coding units divided from a current block wherein the two or more of the plurality of coding units share a coding parameter, and the group of coding units overlaps at least two different pipeline units associated with a pipelined decoding operation, and encoding or decoding the current block based on the group of coding units, and the shared coding parameter.

Abstract: The present invention relates to an intra prediction scheme among video coding techniques and, more particularly, relates to a video decoding method and apparatus for diving a block into a plurality of sub-blocks when intra prediction is performed and sequentially performing infra prediction on each of the sub-blocks. The decoding method performed by a video decoding apparatus includes determining whether to perform sub-block-based intra prediction on a current coding unit, dividing the current coding unit into a plurality of sub-blocks, performing intra prediction on each of the sub-blocks when a result of determination of whether to perform sub-block-based intra prediction has a value of “true”, and directly performing block-based intra prediction on the current coding unit without dividing the current coding unit when the result of the determination has a value of “false”.

Abstract: A coding efficiency increase is achieved by using a common signalization within the bitstream with regard to activation of merging and activation of the skip mode. One possible state of one or more syntax elements within the bitstream may signalize for a current sample set of a picture that the sample set is to be merged and has no prediction residual encoded and inserted into the bitstream. A common flag may signalize whether the coding parameters associated with a current sample set are to be set according to a merge candidate or to be retrieved from the bitstream, and whether the current sample set of the picture is to be reconstructed based on a prediction signal depending on the coding parameters associated with the current sample set, without any residual data, or to be reconstructed by refining the prediction signal depending on the coding parameters associated with the current sample set by means of residual data within the bitstream.

Abstract: A method, computer program, and computer system is provided for coding video data. Video data is received, and a set of hybrid transform kernels corresponding to the video data is identified. A subset of hybrid transform kernels is selected, either explicitly or implicitly, from among the set of hybrid transform kernels. The video data is decoded based on the selected subset of hybrid transform kernels.

Abstract: Various embodiments provide a decoder configured to select a filter based on a block size of a first block and a block size of a second block in an image, and change values of pixels in the first block and the second block. The filter includes a first set of multipliers and a first set of offsets for the first block, and a second set of multipliers and a second set of offsets for the second block. The values of the pixels in the first block and the second block are changed by performing multiplication with each multiplier in the first set of multipliers, by performing multiplication with each multiplier in the second set of multipliers, and by using the first set of offsets and the second set of offsets.

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes a processor that is configured to decode prediction information of a current block in a current coding tree unit (CTU) from a coded video bitstream. The prediction information is indicative of an intra block copy mode. The processor is configured to determine a search range for the intra block copy mode based on a size of the current CTU, and determine a block vector that points to a reference block in a same picture as the current block and within the determined search range, the reference block having reconstructed samples buffered in a reference sample memory. Further, the processor is configured to reconstruct at least a sample of the current block based on the reconstructed samples of the reference block that are retrieved from the reference sample memory.

Abstract: According to the disclosure of the present document, scaling list data delivered in an adaptation parameter set (APS) may be signaled through a hierarchical structure, and the amount of data that needs to be signaled for video/image coding may be reduced and implementation may be facilitated by placing limits on the scaling list data delivered in the APS.

Abstract: An apparatus includes an interface and a processor. The interface may be configured to receive pixel data from a capture device. The processor may be configured to (i) process the pixel data arranged as one or more video frames, (ii) extract features from the one or more video frames, (iii) generate fused maps for at least one of disparity and optical flow in response to the features extracted, (iv) generate regenerated image frames by performing warping on a first subset of the video frames based on (a) the fused maps and (b) first parameters, (v) perform a classification of a sample image frame based on second parameters, and (vi) update the first parameters and the second parameters in response to whether the classification is correct. The classification generally comprises indicating whether the sample image frame is one of a second subset of the video frames or one of the regenerated image frames.

Abstract: Embodiments for video processing, including video coding, video decoding and video transcoding are described. One example method includes performing a conversion between a video having one or more video pictures in a video layer and a bitstream of the video according to a rule, wherein the rule specifies that, in a process of sub-bitstream extraction, removal of (i) a video coding layer (VCL) network abstraction layer (NAL) unit, (ii) filler data NAL units associated with the VCL NAL unit, and (iii) filler payload supplemental enhancement information (SEI) messages associated with the VCL NAL unit is performed regardless of an availability of an external means used to replace a parameter set that is removed during the sub-bitstream extraction.

Abstract: Innovations in signaling of reference picture list (“RPL”) modification information. For example, a video encoder evaluates a condition that depends at least in part on a variable indicating a number of total reference pictures. Depending on the results of the evaluation, the encoder signals in a bitstream a flag that indicates whether an RPL is modified according to syntax elements explicitly signaled in the bitstream. A video decoder evaluates the condition and, depending on results of the evaluation, parses from a bitstream a flag that indicates whether an RPL is modified according to syntax elements explicitly signaled in the bitstream. The condition can be evaluated as part of processing for an RPL modification structure that includes the flag, or as part of processing for a slice header. The encoder and decoder can also evaluate other conditions that affect syntax elements for list entries of the RPL modification information.

Abstract: Aspects of the disclosure provide a method and an apparatus including processing circuitry for video decoding. The processing circuitry can decode coding information for a plurality of blocks from a coded video bitstream. The coding information can indicate a high-level control flag for the plurality of blocks. The high-level control flag can indicate whether a plurality of coding tools is disabled for at least one of the plurality of blocks where at least one of the plurality of blocks includes a current block. The processing circuitry can determine whether the plurality of coding tools is disabled for the at least one of the plurality of blocks based on the high-level control flag. The processing circuitry can reconstruct the current block without the plurality of coding tools based on the plurality of coding tools being determined as disabled.

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: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include obtaining a current block by splitting an image, determining a prediction mode of the current block, generating an intra prediction block of the current block, based on the prediction mode of the current block being an intra prediction mode, generating a residual block of the current block, and reconstructing the current block based on the prediction block and the residual block of the current block.

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure comprises determining whether to apply intra prediction to a current chroma block based on information on prediction of the current chroma block, deriving an intra prediction mode of the current chroma block based on an intra prediction mode of a corresponding luma block corresponding to the current chroma block and intra chroma prediction mode information of the current chroma block, when intra prediction applies to the current chroma block, and generating a prediction block of the current chroma block, by performing intra prediction based on the intra prediction mode of the current chroma block. When the intra prediction mode of the corresponding luma block is not present, the intra prediction mode of the current chroma block is derived based on a default intra prediction mode.

Abstract: Innovations in signaling of reference picture list (“RPL”) modification information. For example, a video encoder evaluates a condition that depends at least in part on a variable indicating a number of total reference pictures. Depending on the results of the evaluation, the encoder signals in a bitstream a flag that indicates whether an RPL is modified according to syntax elements explicitly signaled in the bitstream. A video decoder evaluates the condition and, depending on results of the evaluation, parses from a bitstream a flag that indicates whether an RPL is modified according to syntax elements explicitly signaled in the bitstream. The condition can be evaluated as part of processing for an RPL modification structure that includes the flag, or as part of processing for a slice header. The encoder and decoder can also evaluate other conditions that affect syntax elements for list entries of the RPL modification information.

Abstract: A method of coding 4:2:2 or 4:4:4 video data comprises predicting luminance and/or chrominance samples of an image from other respective reference samples derived from the same image according to a prediction mode associated with a sample to be predicted, the prediction mode being selected for each of a plurality of blocks of samples, from a set of two or more candidate prediction modes; detecting differences between the samples and the respective predicted samples; selecting a frequency-separation transform from two or more candidate frequency separation transforms according to the prediction mode associated with a current block of samples using a mapping between transform and prediction mode, the mapping between different, as between chrominance and luminance samples, for at least the 4:4:4 format; and encoding the detected differences by frequency-separating the differences, using the selected frequency-separation transform.

Abstract: A spatial complexity and a temporal complexity associated with one or more frames of media content may be determined. Based on the spatial complexity and the temporal complexity of the media content, a Group of Picture (GOP) size for the one or more frames of the media content may be determined. The GOP size may be inversely proportional to the spatial complexity and the temporal complexity of the one or more frames of media content. Certain frames of the media content may be arranged in a different GOP size as compared to one or more other frames of the media content. By varying the GOP size of the plurality of frames of the media content, the bitrate required to transmit the media content may be decreased without decreasing or substantially decreasing the overall quality of the media content.

Abstract: A video decoder for decoding an encoded video signal including encoded picture data and indication data of a picture of a video to reconstruct the picture of the video is provided. The video decoder includes an interface configured for receiving the encoded video signal, and a data decoder configured for reconstructing the picture of the video by decoding the encoded picture data using the indication data. The picture is partitioned into a plurality of coding areas. One or more coding areas of the plurality of coding areas include two or more coding tree units of the plurality of coding tree units, wherein each coding area of the one or more coding areas which includes two or more coding tree units exhibits a coding order for the two or more coding tree units of the coding area.

Abstract: A method of encoding video data by an electronic device is provided. A block unit is determined from an image frame according to the video data. A line index is encoded in a bitstream based on a selected reference line of the block unit and is compared with a first predefined value to determine whether to encode a mode flag in the bitstream. A mode index is directly encoded in the bitstream for indicating a prediction mode of the block unit from a most probable mode (MPM) list of the block unit when the mode flag is not encoded. The mode flag is compared to a second predefined value for encoding the mode index when the mode flag is encoded in the bitstream to indicate whether the prediction mode is selected from the MPM list. The block unit is predicted based on the selected reference line and the prediction mode.

Abstract: A method of encoding or decoding video includes: dividing a current video block into multiple sub-blocks video blocks; generating a merge candidate list for at least one sub-blocks video blocks of the multiple sub-blocks video blocks; and performing a conversion between the video block and a bitstream of the video block based one the merge candidate list; wherein the merge candidate list comprises at least one merge candidate with multi-hypothesis mode.

Abstract: Innovations in signaling of reference picture list (“RPL”) modification information. For example, a video encoder evaluates a condition that depends at least in part on a variable indicating a number of total reference pictures. Depending on the results of the evaluation, the encoder signals in a bitstream a flag that indicates whether an RPL is modified according to syntax elements explicitly signaled in the bitstream. A video decoder evaluates the condition and, depending on results of the evaluation, parses from a bitstream a flag that indicates whether an RPL is modified according to syntax elements explicitly signaled in the bitstream. The condition can be evaluated as part of processing for an RPL modification structure that includes the flag, or as part of processing for a slice header. The encoder and decoder can also evaluate other conditions that affect syntax elements for list entries of the RPL modification information.

Abstract: A better rate distortion ratio is achieved by making interrelationships between coding parameters of different planes available for exploitation for the aim of redundancy reduction despite the additional overhead resulting from the need to signal the inter-plane prediction information to the decoder. In particular, the decision to use inter plane prediction or not may be performed for a plurality of planes individually. Additionally or alternatively, the decision may be done on a block basis considering one secondary plane.

Abstract: Methods for performing palette coding of video data may include: determining whether a luma component of a coding unit (CU) and chroma components of the CU are coded jointly or separately in a palette mode; and in response to the luma component and the chroma components being coded separately in the palette mode, determining a maximum separate palette-table size for the CU; determining a maximum separate palette-predictor size for the CU; and predicting the CU based on the maximum separate palette-table size and the maximum separate palette-predictor size.

Abstract: A medical imaging system, said system comprises a device configured to be inserted to a patient's body, comprising an elongated tube, comprising two or more cameras for capturing visual content in the vicinity of the device in different directions of view, a wireless module configured to transmit data captured by the two or more cameras to a remote devices, and a video receiving system configured to wirelessly receive and synchronize images captured by the two or more cameras, process the images into video and display the video on one or more display devices.

Abstract: A video processing method is described. The method includes determining, for a conversion between a video unit of a video and a coded representation of the video, a maximum number of entries of a palette of representative values used during the conversion according to a rule; and performing the conversion using the palette, and wherein the rule specifies the maximum number of entries according to a characteristic of the video unit.

Abstract: A moving picture coding method includes (i) transforming, for each of one or more second processing units included in the first processing unit, a moving picture signal in a spatial domain into a frequency domain coefficient and quantizing the frequency domain coefficient, and (ii) performing arithmetic coding on a luminance CBF flag indicating whether or not a quantized coefficient is included in the second processing unit in which transform and quantization are performed, wherein, in the arithmetic coding, a probability table for use in arithmetic coding is determined according to whether or not the size of the first processing unit is identical to the size of the second processing unit and whether or not the second processing unit has a predetermined maximum size.

Abstract: A method of decoding a coded video bitstream is provided. The method includes obtaining a first reference picture list structure and a second reference picture list structure represented in the coded video bitstream; deriving, based on the first reference picture list structure and the second reference picture list structure, a first reference picture list of a current slice and a second reference picture list of the current slice, wherein the current slice comprises an intra (I) slice or a uni-predictive (P) slice; and obtaining at least one reconstructed block of the current slice following derivation of the first reference picture list and the second reference picture list.