2results about How to "Achieve initial screening" patented technology

The invention relates to the technical field of video image recognition, in particular to a vehicle access recognition method and system for a nested parking lot, and the method comprises the steps: obtaining video data when a vehicle passes through each barrier gate, extracting a vehicle region from each frame of image, removing a background, and reducing the interference of irrelevant information; performing block analysis on the vehicle area, constructing an initial vehicle model according to the vehicle feature information, and establishing a vehicle unique identifier; when the vehicle passes through other barrier gates subsequently, comparing the video key frames with regional features in the initial vehicle model, and extracting feature regions which do not appear in the previous passing video frames of the vehicle; through feature matching degree calculation, feature regions of the vehicle at different visual angles are accurately matched, identification deviation caused by different camera positions is avoided, matching accuracy is improved, and the method is suitable for a complex nested parking lot environment.

The application discloses a machine learning-based digital twin dynamic optimization method, device and medium, relates to the technical field of network security, and solves the problem that a to-be-optimized node in a network cannot be accurately screened based on an influence degree. The method comprises the following steps: acquiring network structure data and historical abnormal data of a target network, and mapping the target network to a digital network space according to the network structure data and the historical abnormal data; analyzing different transmission nodes in the digital network space; analyzing different transmission nodes in the digital network space according to the historical abnormal data, to obtain a first transmission node and a second transmission node; analyzing the first transmission node and the second transmission node, to obtain a to-be-optimized node in the digital network space; and optimizing a corresponding network node in the target network according to the to-be-optimized node in the digital network space. The application realizes accurate screening of a to-be-optimized node in a network based on an influence degree.