Abstract: Provided are a video decoding method and apparatus and a video encoding method and apparatus which determine whether to use a Most Probable Mode (MPM) list, based on encoding information of a current block, obtain, from a bitstream, intra prediction mode index information indicating one of candidate intra prediction modes included in the MPM list, and determine an intra prediction mode of the current block by using the obtained intra prediction mode index information.

Abstract: An image encoder includes a processor and a memory. The memory includes instructions configured to cause the processor to perform operations. In one example implementation, the operations may include determining whether a dictionary item is available for replacing a block of an image being encoded, the determining based on a hierarchical lookup mechanism, and encoding the image along with reference information of the dictionary item in response to determining that the dictionary item is available. In one more example implementation, the operations may include performing principal component analysis (PCA) on a block to generate a corresponding projected block, the block being associated with a group of images, comparing the projected block with a corresponding threshold, descending the block recursively based on the threshold until a condition is satisfied, and identifying a left over block as a cluster upon satisfying of the condition.

Abstract: A decoding method is presented. An illumination compensation parameter is first determined for a current block of a picture. The illumination compensation parameter is determined from one or more illumination compensation parameters or from one or more reconstructed samples of at least one spatially neighbor block only in the case where said at least one spatially neighbor block belongs to the same local illumination compensation group as the current block, called current local illumination compensation group. Finally, the current block is reconstructed using the determined illumination compensation parameter.

Abstract: In some embodiments, a method selects a first template of pixels that is outside of a first block and a second template of pixels that is outside of the first block. Then, the method selects a first region of pixels that are inside the first block and a second region of pixels that are inside the first block. A first weight is calculated based on the first template of pixels and the first region of pixels and a second weight is calculated based on the second template of pixels and the second region of pixels. The first weight and the second weight are used in a motion prediction search for a second block.

Abstract: An intra prediction method and a device using the intra prediction method are provided. The intra prediction method includes the steps of: deriving a current prediction mode as a prediction mode of a current block; constructing neighboring samples of the current block with available reference samples; filtering the available reference samples; and generating predicted samples of the current block on the basis of the filtered available reference samples. The filtering step includes performing the filtering using the available reference sample located in the prediction direction of the current prediction mode and a predetermined number of available reference samples neighboring to the prediction direction of the current prediction mode.

Abstract: A method, computer program, and computer system is provided for decoding point cloud data. Data corresponding to a point cloud is received. A number of contexts associated with the received data is reduced based on reducing a size of an array corresponding to syntax elements for predictive tree-based coding of the point cloud. The data corresponding to the point cloud is decoded based on the reduced number of contexts.

Abstract: Provided are a video decoding method and apparatus and a video encoding method and apparatus which determine whether to use a Most Probable Mode (MPM) list, based on encoding information of a current block, obtain, from a bitstream, intra prediction mode index information indicating one of candidate intra prediction modes included in the MPM list, and determine an intra prediction mode of the current block by using the obtained intra prediction mode index information.

Abstract: Provided are a video decoding method and apparatus and a video encoding method and apparatus which determine whether to use a Most Probable Mode (MPM) list, based on encoding information of a current block, obtain, from a bitstream, intra prediction mode index information indicating one of candidate intra prediction modes included in the MPM list, and determine an intra prediction mode of the current block by using the obtained intra prediction mode index information.

Abstract: Provided are a video decoding method and apparatus and a video encoding method and apparatus which determine whether to use a Most Probable Mode (MPM) list, based on encoding information of a current block, obtain, from a bitstream, intra prediction mode index information indicating one of candidate intra prediction modes included in the MPM list, and determine an intra prediction mode of the current block by using the obtained intra prediction mode index information.

Abstract: Disclosed is a method of decoding an image and a method of encoding an image. The method of decoding an image includes: obtaining motion-constrained tile set information; determining, on the basis of the motion-constrained tile set information, a first boundary region of a collocated tile set within a reference picture, which corresponds to a motion-constrained tile set; padding a second boundary region corresponding to the first boundary region; and performing inter prediction on the motion-constrained tile set by using a collocated tile set that includes the padded second boundary region.

Abstract: An image signal decoding method according to the present invention comprises the steps of: decoding information indicating whether a current block is encoded using a multi-mode intra prediction; when it is determined that the current block is encoded in the multi-mode intra prediction, dividing the current block into a plurality of partial blocks; and obtaining an intra prediction mode of each of the plurality of partial blocks.

Abstract: An image signal decoding method according to the present invention comprises the steps of: decoding information indicating whether a current block is encoded using a multi-mode intra prediction; when it is determined that the current block is encoded in the multi-mode intra prediction, dividing the current block into a plurality of partial blocks; and obtaining an intra prediction mode of each of the plurality of partial blocks.

Abstract: An image decoding method performed by a decoding apparatus according to the present invention comprises: a step of deriving an intra prediction mode for a current block; a step of deriving upper neighboring samples of a plurality of rows for the current block, and left neighboring samples of a plurality of columns; a step of deriving one row of upper reference samples on the basis of the upper neighboring samples; a step of deriving one column of left reference samples on the basis of the left neighboring samples; and a step of generating a prediction sample for the current block by using at least one of the upper reference samples and the left reference samples in accordance with the intra prediction mode.

Abstract: Methods and apparatus for compressing image data are described along with corresponding methods and apparatus for decompressing the compressed image data. An encoder unit, which generates the compressed image data, comprises an input arranged to receive a first image and a second image, wherein the second image is twice the width and height of the first image, a prediction generator arranged to generate a prediction texture from the first image using an adaptive interpolator, a difference texture generator arranged to generate a difference texture from the prediction texture and the second image and in encoder unit arranged to encode the difference texture.

Abstract: Disclosed are a method for decoding a video signal and a device therefore. More particularly, a method for decoding an image based on an intra prediction mode, may comprise the steps of: acquiring a most probable mode (MPM) flag for indicating whether an MPM is applied to a current block, the MPM representing a mode in which an intra prediction mode of the current block is induced from an intra predicted block neighboring the current block; configuring an MPM list, on the basis of whether intra prediction modes of a left neighboring block and an above neighboring block of the current block satisfy predefined conditions, if the MPM is applied to the current block; acquiring an MPM index for indicating, within the MPM list, a specific intra prediction mode; and generating a prediction block for the current block by using the intra prediction mode specified by the MPM index.

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus includes processing circuitry. For example, the processing circuitry obtains reconstructed samples in a temporal source frame that is different from a current frame, and determines filter coefficients of a filter for a current block in the current frame based on at least the reconstructed samples in the temporal source frame. The processing circuitry generates prediction information of the current block based on the determined filter coefficients. The temporal source frame is an inter coded frame that satisfies at least one of a quantization parameter (QP) requirement, a temporal distance requirement, and a reference picture requirement.

Abstract: A method of video processing includes making a determination, fora conversion between a current video block of a video and a coded representation of the video, of an affine merge candidate selectively according to a rule; and performing the conversion according to the determination. The rule specifies how the affine merge candidate is calculated without use of a log 2(X) operation where X is equal to or less than zero. The affine merge candidate is a motion candidate derived from neighboring affine coded video blocks.

Abstract: A three-dimensional data encoding method includes: encoding first information of a first current node or second information of a second current node, the first current node being included in an N-ary tree structure of first three-dimensional points included in a first three-dimensional point cloud, N being 2 or 4, the second current node being included in an octree structure of second three-dimensional points included in a second three-dimensional point cloud. The encoding of the first information or the second information includes encoding the first information using a first encoding pattern including a pattern common to a second encoding pattern used in encoding the second information.

Abstract: An image encoding/decoding method and device according to the present disclosure may configure a reference sample for a cross component prediction of a chroma component block, derive a cross component prediction parameter by using the reference sample, and make a cross component prediction of the chroma component block on the basis of the cross component prediction parameter and a luma component block corresponding to the chroma component block.

Abstract: The present invention relates to an intra prediction mode mapping method and a device using the method. The intra prediction mode includes: decoding flag information providing information regarding whether an intra prediction mode of a plurality of candidate intra prediction modes for the current block is the same as the intra prediction mode for the current block, and decoding a syntax component including information regarding the intra prediction mode for the current block in order to induce the intra prediction mode for the current block if the intra prediction mode from among the plurality of candidate intra prediction modes for the current block is not the same as the intra prediction mode for the current block. Thus, it is possible to increase the efficiency with which are images are decoded.

Abstract: Embodiments of the present application provide an occupancy information prediction method, an encoder, a decoder, and a storage medium. The occupancy information prediction method comprises: when an encoder encodes geometrical information on the basis of an octree, determining encoding information corresponding to a neighboring node of a node to be predicted, and a distance parameter between a child node of the node to be predicted and the neighboring nodes; wherein the encoding information corresponding to the neighboring node comprises occupancy information; determining an occupancy weight corresponding to the child node of the node to be predicted according to the distance parameter, and the encoding information corresponding to the neighboring node; performing a prediction processing on the child node according to the occupancy weight and a preset occupancy threshold set to obtain a node type corresponding to the child node.

Abstract: A decoding method is disclosed. The decoding method comprises: determining an index from a bitstream, the index identifying a coding element in a set of a plurality of coding elements; decoding a picture block from the bitstream using the coding element of the set identified by the index. In a specific embodiment, determining the index comprises: determining, for each coding element in the set, a probability that the coding element was used for encoding the picture block; and determining the index responsive to the determined probabilities.

Abstract: A method of processing an image divided into a plurality of pixel blocks which are processed according to a processing sequence is provided, which comprises, for a current pixel block: determining an application area consisting of a set of pixels in blocks preceding the current block in the processing sequence, for each pixel of the application area, computing a gradient representing a directional change of an intensity at the pixel, and selecting, based on at least one of the computed gradients, an intra prediction video coding mode among a plurality of intra prediction video coding modes usable for encoding and/or decoding the current block.

Abstract: A method can include decoding residual signals to generate quantized coefficient components; determining an inverse scan pattern and generating a quantized block using the inverse scan pattern; deriving a quantization parameter and inversely quantizing the quantized block using the quantization parameter to generate a transformed block; and inversely transforming the transformed block to generate a residual block, in which when the quantization parameter is a chroma quantization parameter, the chroma quantization parameter is generated using a luma quantization parameter and an offset parameter indicating a relationship between the luma quantization parameter and the chroma quantization parameter, the luma quantization parameter is derived using a differential quantization parameter and a quantization parameter predictor, and the differential quantization parameter is generated by entropy decoding, and parameters are set according to certain conditions.

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure includes receiving intra prediction information including at least one of most probable mode (MPM) flag information representing whether to derive an intra prediction mode for a current block based on MPM candidates for the current block or planar flag information representing whether to determine the intra prediction mode for the current block as a planar mode, deriving the intra prediction mode for the current block based on the MPM flag information and the planar flag information, deriving a predicted block for the current block based on the intra prediction mode for the current block, and generating a reconstructed picture based on the predicted block.

Abstract: There is provided a computer-implemented method and a decompression unit for decompressing a compressed block of data in accordance with a multi-level difference table. The compressed block of data represents a block of image data comprising a plurality of image element values, wherein each level of the multi-level difference table comprises a plurality of entries. An origin value for the block of image data is determined using data representing the origin value from the compressed block of data. A level within the multi-level difference table for the block of image data is identified using an indication of the level from the compressed block of data.

Abstract: A decoding method and a decoder for decoding a current block of a video frame is provided, wherein the decoding method comprises determining a list of Most Probable Modes (MPMs) for the current block. When at least one condition is satisfied, the list of MPMs includes a DC mode, a Vertical mode, a Horizontal mode, an intra prediction mode corresponding to a value of the Vertical mode with a first offset, and an intra prediction mode corresponding to the value of the Vertical mode with a second offset. The decoding method further includes obtaining a MPM flag and a MPM index for the current block from a bitstream of the video, and obtaining an intra prediction mode for the current block for reconstructing the current block.

Abstract: Video/picture coding of improved coding efficiency with supporting varying resolution and/or efficiently handling region-wise packing.

Abstract: An apparatus for block-wise decoding a picture from a data stream and/or encoding a picture into a data stream, the apparatus supporting at least one intra-prediction mode according to which the intra-prediction signal for a block of a predetermined size of the picture is determined by applying a first template of samples which neighbours the current block onto a neural network. The apparatus may be configured, for a current block differing from the predetermined size, to: resample a second template of samples neighboring the current block, so as to conform with the first template so as to obtain a resampled template; apply the resampled template of samples onto the neural network so as to obtain a preliminary intra-prediction signal; and resample the preliminary intra-prediction signal so as to conform with the current block so as to obtain the intra-prediction signal for the current block.

Abstract: Methods and systems for aligning images of a specimen generated with different modes of an imaging subsystem are provided. One method includes separately aligning first and second images generated with first and second modes, respectively, to a design for the specimen. For a location of interest in the first image, the method includes generating a first difference image for the location of interest and the first mode and generating a second difference image for the location of interest and the second mode. The method also includes aligning the first and second difference images to each other and determining information for the location of interest from results of the aligning.

Abstract: An apparatus can include a prediction mode decoding module configured to derive a luma intra prediction mode and a chroma intra prediction mode; a prediction size determining module configured to determine a size of a luma transform unit and a size of a chroma transform unit using transform size information; a reference pixel generating module configured to generate referential pixels if at least one reference pixel is unavailable; a reference pixel filtering module configured to adaptively filter the reference pixels of a current luma block based on the luma intra prediction mode and the size of the luma transform unit, and not to filter the reference pixels of a current chroma block; a prediction block generating module configured to generate prediction blocks of the current luma block and the current chroma block; a residual bock generating module configured to generate a luma residual block and a chroma residual block; and an adder.

Abstract: An image decoding method according to the present document includes: a step for deriving a luma intra prediction mode; and a step for generating a chroma candidate mode list for a chroma block including a preset number of chroma intra candidates by using at least one among a DM, a planar mode, a DC mode, a vertical mode, a horizontal mode, and an up-right diagonal mode, which are derived from the luma intra prediction mode, wherein the DM is a prediction mode corresponding to a center (CR) position of the luma block, and the chroma intra candidates other than the DM can be derived through a duplicate check of the DM and a prediction mode corresponding to any one among the top left (TL), top right (TR), bottom left (BL), and bottom right (BR) of the luma block, the planar mode, the DC mode, the vertical mode, and the horizontal mode.

Abstract: A method by which a decoding device performs image decoding, according to the present invention, comprises the steps of: deriving an intra prediction mode of a current block; deriving neighboring samples including left neighboring samples and upper neighboring samples of the current block; deriving reference samples for prediction of a target sample among the neighboring samples on the basis of the position of the target sample of the current block and the prediction angle of the intra prediction mode; determining an interpolation filter for the target sample; and deriving the prediction sample of the target sample on the basis of the interpolation filter and the reference samples.

Abstract: A method for video bitstream processing includes generating a prediction block for a first video block of a video related to a first component, where the prediction block is selectively generated according to a criterion by applying a two-step cross-component prediction mode (TSCPM), and performing a conversion between the first video block and a bitstream representation of the video using the prediction block, wherein a first field in the bitstream representation corresponds to the TSCPM.

Abstract: A computer-implemented method for transferring data is provided. In an illustrative embodiment, the method includes retrieving, by a computer, an original dataset to be sent from a sender to a receiver. The method also includes generating, by the computer, a model based on at least a subset of the original dataset. The model generates a predicted dataset. The model is selected from a plurality of model types based on data complexity of the original dataset and a desired level of approximation of the predicted dataset to the original dataset. The method also includes transferring, by the computer, the model to the receiver. The receiver uses the model to generate the predicted dataset, wherein the predicted dataset matches the original dataset to a selected degree of approximation. Transfer of the model is quicker than transfer of the original dataset.

Abstract: Disclosed are an image encoding/decoding method and apparatus. The image decoding method includes decoding coding mode information of a current coding block, dividing the current coding block into at least one prediction block, and generating prediction samples of the at least one prediction block on the basis of the decoded coding mode, in which the coding mode information is information indicating any one mode among intra mode, inter mode, and hybrid mode.

Abstract: An image processing apparatus decodes encoded RAW data that includes subband data being encoded with lossy encoding scheme, and determines one of a plurality of classifications based on the decoded subband data, wherein the plurality of classifications are based on a feature of an image. The apparatus also obtains correction data corresponding to the determined classification, and corrects recomposed data, which is obtained by applying frequency recomposition to the decoded subband data, based on the correction data, in order to obtain the corrected data as decoded RAW data.

Abstract: In order to improve the learning performance of a neural network model, this image recognition model generating device is provided with an input image patch determining unit, a similar patch searching unit, a pixel value generating unit, and a convolution processing unit. The input image patch determining unit determines an input image patch containing a border region in contact with the outside of a boundary line of an input image. The similar patch searching unit searches for a similar patch that is similar to the input image patch. The pixel value generating unit generates a pixel value complementing the border region, on the basis of the similar patch. The convolution processing unit performs a convolution process from the generated pixel value and pixel values of the input image.

Abstract: The present specification discloses a method of decoding an image. The method of decoding an image according to the method includes: obtaining transform skip information of a current block from a bitstream; obtaining multiple transform selection information of the current block on the basis of the transform skip information from the bitstream; and performing inverse transform on the current block on the basis of the multiple transform selection information, wherein the multiple transform selection information is used to set each of a horizontal transform type and a vertical transform type.

Abstract: A video processing method includes dividing a coding tree unit into one or more coding units using a quadtree plus binary tree division method, determining a specific neighboring image block of a coding unit having a reference image same as a co-located reference image of the coding unit, determining a related reference block of the coding unit in the co-located reference image according to a motion vector of the specific neighboring image block, dividing the related reference block into several related reference sub-blocks, and performing prediction for the coding unit according to scaled or unscaled motion vector of the related reference sub-block depending on whether the motion vector of the related sub-block points to a short-term or a long-term reference image.

Abstract: A video processing method includes dividing a coding tree unit into one or more coding units using a quadtree plus binary tree division method, dividing a coding unit into one or more sub-blocks, determining a specific neighboring image block of the coding unit having a reference image same as a co-located reference image of the coding unit, determining a related reference block of the coding unit in the co-located reference image according to a motion vector of the specific neighboring image block, dividing the related reference block into several related reference sub-blocks, determining a scaling factor of a motion vector of the related reference sub-block in different manners according to whether that motion vector points to a short-term reference image or a long-term reference image, scaling that motion vector using the scaling factor, and performing prediction for the coding unit according to the scaled motion vector.

Abstract: Aspects of the disclosure provide a method and an apparatus for video coding. In some examples, the apparatus includes processing circuitry. The processing circuitry decodes prediction information of a current block in a current picture from a coded video bitstream and the prediction information is indicative of inter prediction. The processing circuitry determines, for the current block, motion information including a first motion vector (MV) that has a x component and a y component where each of the x and y components has a fractional MV precision that is 2?N of a sample size in the current block and has one of 2L+1 MV values with the fractional MV precision. N is an integer larger than 2 and L is a positive integer. The processing circuitry reconstructs at least one sample of the current block based on the motion information.

Abstract: The encoder includes processing circuitry, and memory. Using the memory, the processing circuitry: generates a predicted image of an input image that is a current image to be encoded, based on generated data output from a generator network in response to a reference image being input to the generator network, the generator network being a neural network; calculates a prediction error by subtracting the predicted image from the input image; and generates an encoded image by at least transforming the prediction error.

Abstract: Provided are a method and a device for decoding a video signal to provide stereographic image content with high resolution. For decoding a video signal, an intra prediction mode of a current block is determined, and a prediction sample is obtained by performing intra prediction of the current block based on the intra prediction mode.

Abstract: An image decoding apparatus can include a prediction mode decoding module for deriving luma intra prediction mode and chroma intra prediction mode; a prediction size determining module for determining a size of a luma transform unit and a size of a chroma transform unit; a reference pixel generating module for generating a reference pixel when at least one reference pixel is unavailable; a reference pixel filtering module for adaptively filtering a reference pixel of a current luma block based on the luma intra prediction mode and the size of the luma transform unit, wherein a reference pixel of a current chroma block is not filtered; a prediction block generating module for generating prediction blocks of the current luma block and the current chroma block; and a residual block generating module for generating a luma residual block and a chroma residual block.

Abstract: This disclosure relates to video coding and more particularly to techniques for performing motion vector prediction. According to an aspect of an invention, a motion vector and a corresponding reference picture identifier for the motion vector are received; a reference picture corresponding to a second motion vector is determined based on the reference picture corresponding to the received motion vector and a current picture; a scaling value is determined based on the determined reference picture, the reference picture corresponding to the received motion vector, and the current picture; and the second motion vector is generated from the received motion vector by scaling with the scaling value.

Abstract: An image decoding method performed by a decoding apparatus according to the present invention comprises: a step of deriving an intra prediction mode for a current block; a step of deriving upper neighboring samples of a plurality of rows for the current block, and left neighboring samples of a plurality of columns; a step of deriving one row of upper reference samples on the basis of the upper neighboring samples; a step of deriving one column of left reference samples on the basis of the left neighboring samples; and a step of generating a prediction sample for the current block by using at least one of the upper reference samples and the left reference samples in accordance with the intra prediction mode.

Abstract: A CPU of a rounding imaging management apparatus functions as a first acquisition unit, a second acquisition unit, a creation unit, and an output controller. The first acquisition unit acquires imaging order information indicating content of radiography in the rounding imaging to be performed. The second acquisition unit acquires, from time results data in which a necessary time in the rounding imaging performed in the past is registered, the necessary time. The creation unit creates a rounding plan of the rounding imaging on the basis of the imaging order information and the necessary time. The output controller performs a control for outputting the rounding plan.

Abstract: This application relates to a video encoding method and apparatus, a video decoding method and apparatus, a computer device, and a storage medium. The computer device obtains a to-be-encoded current encoded block in a current video frame and then obtains a first reference block corresponding to the current encoded block in a reference video frame. Next, the computer device obtains, within the reference video frame, one or more second reference blocks matching the first reference block, the one or more second reference blocks and the first reference block being similar reference blocks. Finally, the computer device encodes the current encoded block according to the first reference block and the one or more second reference blocks, to obtain encoded data.

Abstract: Disclosed is a method of decoding an image and a method of encoding an image. The method of decoding an image includes: obtaining motion-constrained tile set information; determining, on the basis of the motion-constrained tile set information, a first boundary region of a collocated tile set within a reference picture, which corresponds to a motion-constrained tile set; padding a second boundary region corresponding to the first boundary region; and performing inter prediction on the motion-constrained tile set by using a collocated tile set that includes the padded second boundary region.