Abstract: Devices, systems and methods for lossless coding for visual media coding are described. An exemplary method for video processing includes determining, based on a current video block of a video satisfying a dimension constraint, that coding modes are enabled for representing the current video block in a bitstream representation, where the dimension constraint states that a same set of allowed dimensions for the current video block is disabled for the coding modes, and where, for an encoding operation, the coding modes represent the current video block in the bitstream representation without using a transform operation, or where, for a decoding operation, the coding modes are used to obtain the current video block without using an inverse transform operation; and performing a conversion between the current video block and the bitstream representation of the video based on one of the coding modes.

Abstract: A method for predicting motion information of a picture block and a related product is provided. The method includes: determining a candidate motion information list of a current picture block, where the candidate motion information list includes at least one combined candidate motion information, one combined candidate motion information is obtained by weighting P candidate motion information by using corresponding weighting factors; determining target motion information in the candidate motion information list; and predicting motion information of the current picture block based on the target motion information.

Abstract: Implementations of the present disclosure provide a solution for encoding and decoding motion information. In this solution, during a conversion between a current video block of a video and a bitstream of the video, a group type of a subgroup of candidates of motion information for the current video block is determined, wherein the group type indicating whether the subgroup of candidates are to be reordered. Further, a list of candidates are constructed based on the group type; and the motion information for the current video block is derived from the list of candidates.

Abstract: Devices, systems and methods related to management of syntax flags with respect chroma formats in video processing are described. In one representative aspect, a video decoding method includes determining, for a conversion between a video and a coded representation of the video, whether a syntax element associated with an adaptive loop filtering (ALF) operation for a chroma component of the video is included in the coded representation based on a condition. The method also includes performing the conversion according to the determining.

Abstract: A method may include obtaining a breast image of an object that is acquired by an imaging device; determining a projection curve based on the breast image; determining a first valley point and a second valley point of the projection curve; determining a peak point of the projection curve based the first valley point and the second valley point of the projection curve; determining a first valley location, a second valley location, and a peak location in the breast image based on the peak point, the first valley point, and the second valley point of the projection curve; and determining a breast region in the breast image based on the first valley location, the second valley location, and the peak location.

Abstract: A heat dissipation system for a high-speed train running in a low-vacuum tube is provided. Component groups that provide power and resistance for the movement and stop of a train are provided at a periphery, close to the train, in a low-vacuum tube. The component group is provided with a group A cooling assembly. The group A cooling assembly includes a group A cooling-type heat exchanger and/or a group A nozzle assembly attached to the back of the component group. Since the friction between the train running at high speed and the air in the low-vacuum tube and the operation of the key equipment in the low-vacuum tube will generate a lot of heat, the group A cooling assembly in the component group in the low-vacuum tube exchanges the heat with the air in the low-vacuum tube.

Abstract: A method and an apparatus and for intra prediction of a picture block are provided, to provide a manner of predicting a current block by using spatial non-adjacent blocks or a temporal neighboring block, thereby improving coding performance. In various embodiments, a first luma intra mode set is constructed; and a bitstream is parsed to obtain a first identifier. In those embodiments, when the first identifier indicates that a luma prediction mode of the current block belongs to the first luma intra mode set, the bitstream is parsed to obtain a second identifier. The second identifier indicates that a candidate luma prediction mode in the first luma intra mode set is used as the luma prediction mode of the current block. Still in those embodiments, a luma prediction value of the current block is obtained based on the luma prediction mode of the current block.

Abstract: Embodiments of the present disclosure provide methods, apparatuses and computer storage media for video processing. One example method comprises determining, during a conversion between a current video block of a video and a bitstream of the video, a motion candidate for the current video block; refining the motion candidate by performing a local search around the motion candidate based on a template matching cost rule; and performing the conversion based on the refined motion candidate, wherein a search order of the local search is related to a coding mode of the current video block.

Abstract: Embodiments of the present disclosure provide methods, apparatuses and computer storage media for video processing. One example method comprises determining, during a conversion between a current video block of a video and a bitstream of the video, a set of motion candidates for the current video block; determining, for each motion candidate in the set of motion candidates, a refined motion candidate by performing a local search around the each motion candidate based on a template matching cost rule; determining, from a set of refined motion candidates generated for the set of motion candidates, a target motion candidate for the current video block; and performing the conversion based on the target motion candidate.

Abstract: Embodiments of the present disclosure provide methods, apparatuses and computer storage media for video processing. One example method comprises determining, during a conversion between a current video block of a video and a bitstream of the video, at least one set of motion candidates for the current video block, each motion candidate comprising predicted motion information determined from neighboring video blocks of the current video block; determining, based on a template of the current video block and from the at least one set of motion candidates, a target motion candidate for the current video block by using a template matching cost rule; and performing the conversion based on the target motion candidate.

Abstract: Devices, systems and methods for digital video coding, which include geometric partitioning, are described. An exemplary method for video processing includes making a decision, based on a priority rule, regarding an order of insertion of motion candidates into a motion candidate list for a conversion between a current block of video and a bitstream representation of the video, wherein the current block is coded using a geometry partition mode; and performing, based on the decision and the motion candidate list, the conversion.

Abstract: The present application relates to improved weighting processing of combined intra-inter prediction. A method for processing video includes: determining, during a conversion between a current video block, which is coded in a combined intra and inter prediction (CIIP) mode, of a video and a bitstream representation of the current video block, a weight pair comprising a first weight for a first prediction result of the current video block and a second weight for a second prediction result of the current video block, based on one or more neighboring video blocks to the current video block, wherein the first prediction result is generated by an intra prediction mode and the second prediction result is generated by an inter prediction mode; and determining a prediction result of the current block based on a weighted sum of the first prediction result and the second prediction result.

Abstract: A medical image processing method and processing apparatus, and a computer readable storage medium. The method includes: obtaining a to-be-processed image; performing a feature extraction on the to-be-processed image to obtain a corresponding feature image; and re-determining a pixel value of each pixel in the to-be-processed image based on first information and second information of a corresponding pixel in the feature image, and processing the to-be-processed image; wherein the first information is information of a pixel adjacent to the corresponding pixel in the features image, and the second information is information of a pixel that is not adjacent to and is similar to the corresponding pixel in the features image.

Abstract: Devices, systems and methods related to management of syntax flags with respect chroma formats in video processing are described. In one representative aspect, a video decoding method includes determining, for a conversion between a video and a coded representation of the video, whether a syntax element associated with an adaptive loop filtering (ALF) operation for a chroma component of the video is included in the coded representation based on a condition. The method also includes performing the conversion according to the determining.

Abstract: Disclosed are transaminase mutants and use thereof. The amino acid sequence of the transaminase mutant is obtained by the mutation of the amino acid sequence as shown in SEQ ID NO: 1, and the mutation at least comprises one of the following mutation sites: the 19-th site, the 41-th site, the 43-th site, the 72-th site, the 76-th site, the 92-th site, the 107-th site, the 125-th site, the 132-th site, the 226-th site, the 292-th site, the 295-th site, the 308-th site, and the 332-th site; and the 19-th site is mutated into a serine, the 41-th site is mutated into a serine, the 43-th site is mutated into an asparagine, a glycine in the 72-th site is mutated into a leucine, etc.; or the amino acid sequence of the transaminase mutant has the mutation sites in the mutanted amino acid sequence, and has more than 80% homology to the mutanted amino acid sequence.

Abstract: An inter prediction method is provided, including: obtaining a first reference frame index and a first motion vector of a to-be-processed block (101); deriving a second reference frame index from the first reference frame index, where the second reference frame index is different from the first reference frame index (102); scaling the first motion vector to obtain a second motion vector (103); obtaining a first reference block of the to-be-processed block according to the first reference frame index and the first motion vector (104); obtaining a second reference block of the to-be-processed block according to the second reference frame index and the second motion vector (105); and weighting the first reference block and the second reference block to obtain a combined prediction block (106). Each reference list for inter prediction is allowed to include two groups of motion information, which helps improve an inter prediction effect.

Abstract: Implementations of the present disclosure provide a solution for encoding and decoding motion information. In this solution, during a conversion between a current video block of a video and a bitstream of the video, a group type of a subgroup of candidates of motion information for the current video block is determined, wherein the group type indicating whether the subgroup of candidates are to be reordered. Further, a list of candidates are constructed based on the group type; and the motion information for the current video block is derived from the list of candidates.

Abstract: Provided are a transaminase mutant and a method for producing a chiral amine using the same. An amino acid sequence of the transaminase mutant is an amino acid sequence obtained by mutation occurred in an amino acid sequence as shown in SEQ ID NO: 1, and the mutation includes at least one of the following mutation sites: position 3, position 5, position 8, position 25, position 32, position 45, position 56, position 59, position 60, position 84, position 86, position 164, position 176, position 178, position 180, position 187, position 197, position 206, position 207, position 242, position 245, position 319 and position 324.

Abstract: A video processing method includes determining, for a conversion between a current video block of a video including multiple video blocks and a coded representation of the video, and from types of reference pictures used for the conversion, applicability of a coding tool to the current video block and performing the conversion based on the determining. The method may be performed by a video decoder or a video encoder or a video transcoder.

Abstract: The present application relates to a method and system for generating multi-task learning-type generative adversarial network for low-dose PET reconstruction, and relates to the field of deep learning. The method includes connecting layers of the encoder with layers of the decoder by skip connection to provide a U-Net type picture generator; generating a group of generative adversarial networks by matching a plurality of picture generators with a plurality of discriminators in one-to-one manner; obtaining a first multi-task learning-type generative adversarial network; designing a joint loss function 1 for improving image quality; and training the first multi-task learning-type generative adversarial network according to the joint loss function 1 in combination with an optimizer to provide a second multi-task learning-type generative adversarial network.