Abstract: A data active selection and annotation method for a point cloud includes: inputting initial point cloud data into a feature extraction model to extract a first feature of annotated point cloud data and a second feature of unannotated point cloud data, the initial point cloud data including the annotated point cloud data and the unannotated point cloud data; inputting the unannotated point cloud data into a classification model to obtain a classification result of the unannotated point cloud data; determining each piece of target point cloud data with a pseudo label identical to a real label from the unannotated point cloud data according to the classification result and the real label of the annotated point cloud data; filtering to-be-annotated point cloud data from each piece of target point cloud data according to the first feature, a second feature and the classification result of each piece of target point cloud data.

Abstract: A method and an apparatus for constructing large-scale urban point cloud dataset and extracting building instance. The method includes obtaining a point cloud feature corresponding to a target point cloud; determining a foreground semantic map, an instance perception feature, and a center offset vector corresponding to the target point cloud based on the point cloud feature; selecting a plurality of building candidate points from building foreground points in the foreground semantic map, determining a relational matrix between the building foreground points and the building candidate points based on the instance perception feature and the center offset vector, determining an instance tag of each building foreground point based on the relational matrix, and merging the instance tag to obtain a result of a building candidate instance; and scoring the result of the building candidate instance, and determining a result of a building instance based on the scoring.

Abstract: The present disclosure belongs to the technical field of PVC foam co-extruded sheets, and particularly relates to a wide low-temperature impact-resistant and bending-resistant PVC foam co-extruded sheet and a preparation method thereof. The PVC foam co-extruded sheet of the present disclosure includes a core layer and a skin layer. Raw materials of the core layer include PVC resin powder, a silicone-methyl methacrylate-ethyl acrylate composite low-temperature toughening and reinforcing agent, a filler, a foaming regulator I, a white foaming agent, a calcium-zinc stabilizer, a cold-resistant plasticizer, stearic acid, polyethylene wax, and oxidized polyethylene wax.

Abstract: The present disclosure belongs to the technical field of PVC foam co-extruded sheets, and particularly relates to a wide low-temperature impact-resistant and bending-resistant PVC foam co-extruded sheet and a preparation method thereof. The PVC foam co-extruded sheet of the present disclosure includes a core layer and a skin layer. Raw materials of the core layer include PVC resin powder, a silicon-acrylic composite low-temperature toughening and reinforcing agent, a filler, a foaming regulator I, a white foaming agent, a calcium-zinc stabilizer, a cold-resistant plasticizer, stearic acid, polyethylene wax, and oxidized polyethylene wax.

Abstract: A method for tracking a target includes: acquiring original position information of an original target point selected by a user contained in a locating request if the locating request for tracking a target is received; carrying out target prediction on a current frame image according to a preset target prediction model to obtain a target prediction result; calculating an Euclidean distance between each of the targets to be tracked and the original target point according to the target position information and original coordinates of each of the target regions to obtain N distances; selecting a distance with the smallest numerical value from the N distances as a target distance, acquiring target position information corresponding to the target distance, and determining a target to be tracked in a target region corresponding to the obtained target position information as a tracked target corresponding to an original target point.

Abstract: A polyvinyl chloride (PVC) foamed ceiling panel and a fabrication method thereof are disclosed. The PVC foamed ceiling panel is made of a PVC resin powder, a filler, a foaming regulator, a composite foaming agent, a calcium-zinc stabilizer, a lubricant, a pigment, a weather resistance modifier, a smoke suppressant, and a flame retardant. The PVC foamed ceiling panel has the advantages of heat resistance, matting, smoke suppression, flame retardancy, environmental friendliness, light weight, small thickness, safety, long-term action, long service life, wide use range, and the like, and can be used for suspended ceilings in residential buildings, office buildings, exhibition halls, conference halls, and the like and for various decorations. The fabrication method of the PVC foamed ceiling panel has the advantages of low cost, high performance, scientific rationality, and simple and easy operation.

Abstract: A method for tracking a target includes: acquiring original position information of an original target point selected by a user contained in a locating request if the locating request for tracking a target is received; carrying out target prediction on a current frame image according to a preset target prediction model to obtain a target prediction result; calculating an Euclidean distance between each of the targets to be tracked and the original target point according to the target position information and original coordinates of each of the target regions to obtain N distances; selecting a distance with the smallest numerical value from the N distances as a target distance, acquiring target position information corresponding to the target distance, and determining a target to be tracked in a target region corresponding to the obtained target position information as a tracked target corresponding to an original target point.

Abstract: The present invention relates to cooking utensils. The present invention provides a slow cooker and a locking assembly that have simple and practical structure, easy to clean and can engage the lid with the liner container for preventing spillage of cooking content such as soup. The structure comprises a container, a lid and a locking assembly. The locking assembly retains the lid on the opening of the container. The container has a rim projecting outside at the opening. The locking assembly comprises a connector disposed on the lid for engaging the lid with the opening of the container, and locking end components provided at ends of the connector for engaging with the rim of the liner container. Using the locking assembly to retain the lid in sealing engagement with the opening of the container, the slow cooker can effectively engage the lid with the container.

Abstract: The present invention relates to cooking utensils. The present invention provides a slow cooker and a locking assembly that have simple and practical structure, easy to clean and can engage the lid with the liner container for preventing spillage of cooking content such as soup. The structure comprises a container, a lid and a locking assembly. The locking assembly retains the lid on the opening of the container. The container has a rim projecting outside at the opening. The locking assembly comprises a connector disposed on the lid for engaging the lid with the opening of the container, and locking end components provided at ends of the connector for engaging with the rim of the liner container. Using the locking assembly to retain the lid in sealing engagement with the opening of the container, the slow cooker can effectively engage the lid with the container.