31results about How to "Narrow detection area" patented technology

A tag detecting system for detecting a movement of a person or an object that mounts an RFID tag, a moving object detecting method, and an entrance / exit management system using the moving object detecting system are provided. The tag detecting system detects a specific person or object by restricting a detection area of the RFID tag to a narrow area. Since the moving object detecting method detects a piggyback, the entrance / exit system prevents the piggyback even if there are a number of persons passing through an entrance / exit gate almost at the same time.

The invention proposes an improved TLD tracking method based on improved Online Boosting and a Kalman filter, belonging to the technical fields of machine vision, artificial intelligence, human-computer interaction, and target tracking. The method includes the following steps: (1) initialization: use the initial sample set formed by selecting the target and affine transformation to initialize the improved Online Boosting classifier and P-N learner; (2) image tracking: select feature points, use twice The L-K optical flow method is used to track it, and the tracking error is compared with the threshold twice to obtain the tracking result; (3) Image detection: after Kalman filter, variance classifier, Online Boosting classifier, KNN classifier (4) Integrated tracking and detection results: evaluate the confidence of the tracker and detector results, and obtain the final module result; (5) Online learning: P-N learner is used to correct the tracker, Detector results, and enrich the sample set. The invention can effectively overcome the occlusion problem, increase the speed of the original method, and simultaneously effectively improve the accuracy and robustness of the detector.

The invention discloses a wireless power transmission winding position identification device and method based on a pre-excitation magnetic field, and belongs to the technical field of wireless power supply. The wireless power transmission winding position identification device comprises a pre-excitation winding, a magnetic sensor, a controller and a pre-excitation power supply. The winding position identification method comprises the following steps of applying a pre-excitation current to the pre-excitation winding, constructing the pre-excitation magnetic field, and detecting the magnetic field sensing intensity in the position of the sensor through the magnetic sensor on the other side. According to a distribution function of the pre-excitation magnetic field disclosed by the invention,the distance between the sensor and the central axis of the pre-excitation side winding is judged, and the dislocation coordinates are determined through a multi-sensor geometric relation. Based on the magnetic field "zero crossing point" characteristic point, the magnetic field distribution rule of the excitation windings with different magnetic structures and different parameters can be automatically determined, and then the relative position coordinates of the pre-excitation winding are calculated, thereby providing in-place information and accurate dislocation position information for automatic parking, automatic charging of an electric automobile and automatic adjustment and compensation of wireless power supply.

The invention provides an image multifeature extraction and fusion method and the system, comprising the following steps of, extracting color features from an image to be matched, matching color with the target image, making sure the color similarity degree, if the color similarity degree exceeds the given color similarity degree threshold, entering the next step; extracting additional feature from the image to be matched, matching the auxiliary features with the target image, determining the auxiliary feature similarity degree, the auxiliary features comprise at least one of texture feature and shape feature; on the base of color similarity degree and auxiliary features similarity degree, making synthesis judgment and acquiring the synthesis similarity degree between the image to be matched and the target image, or matching the target image with the auxiliary features extracted from the matching zone of the image to be matched. The method and the system of the invention apply a cascade connected way to match from roughness to exactness, and can determine exactly the similarity zone of the target image and the image to be matched. The method and the system of the invention achieve a rapid and highly effective matching effect and save manpower and resources.

A weld detecting method that detects a weld on a work includes: obtaining in advance at least one correlation, from among a correlation between a width of the neck and an amount of elongation of the work and a correlation between the width of the neck and an amount of change in at least one of a sheet thickness and a sheet width of the work before and after elongation of the work, and calculating the width of the neck based on the at least one correlation by obtaining at least one of the sheet thickness, the sheet width, or the amount of elongation of the work from the obtained at least one correlation; setting a conveying speed, according to the calculated width of the neck; and detecting the neck by measuring the sheet width of the work at predetermined intervals, while conveying the work at the set conveying speed.