License tag recognizing and vehicle speed measuring method based on videos

Abstract

The invention discloses a license tag recognizing and vehicle speed measuring method based on videos. With the method, license tags from every frame of a video image are recognized, and the license tag recognizing results are calculated out according to the historical information, a higher recognition rate is realized. Meanwhile, the central position of characters can be positioned and tracked with the method to realize the accurate measurement of the vehicle speed. A vehicle head lower edge line detecting and tracking module positions a vehicle head lower edge line according to prospective motion and prospective edge detecting results, efficiently avoids the interference of shadows, captures the position of the vehicle head lower edge line, and tracks. After a trigger line is reached, the vehicle head lower edge line detecting and tracking module carries out space mapping on the historical tracking position to realize the accurate measurement of the vehicle speed. A vehicle lamp pairdetecting and tracking module eliminates the interference of the circumference and headlamps of the vehicle in a night mode, accurately detects the vehicle lamp pair, and tracks. After the trigger line is reached, the vehicle lamp pair detecting and tracking module carries out space mapping on the historical tracking position to realize the accurate measurement of the vehicle speed.

Description

technical field [0001] The invention belongs to the field of intelligent traffic monitoring and management, in particular to a pure video license plate recognition and vehicle speed measurement method. Background technique [0002] At present, license plate recognition systems on the market mainly rely on hardware trigger or video trigger to obtain a frame of video image with vehicles, and then identify the corresponding license plate information through image processing and pattern recognition related algorithms. [0003] The hardware trigger method generally uses a magnetic induction coil, which has a high trigger rate, but the installation of the coil needs to damage the road surface, and the maintenance cost is high; the video trigger method generally uses license plate positioning or virtual coil, which is easy to install and easy to maintain. The complexity and light interference can easily cause too many false reports. [0004] The license plate recognition based on ...

AI Technical Summary

Problems solved by technology

[0005] In the measurement of vehicle speed, the radar detection method is mostly used in the market, which has high detection accuracy, but the input cost is high; on roads with large vehicle traffic and low vehicle speed, false alarms and low detection accuracy will also occur.

Images