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 is the field of intelligent transportation monitoring and management, especially for a pure video license recognition and vehicle speed measurement method. Background technique [0002] At present, the license recognition system on the market mainly depends on the method of hardware trigger or video trigger to obtain a frame of video images with vehicles, and then identify the corresponding license information through image processing and pattern recognition algorithms. [0003] The method of hardware triggering generally uses magnetic coils, with high trigger rates, but the installation of the coil needs to destroy the road surface, and the maintenance cost is high. The method of video triggering generally uses license positioning or virtual coil.The complexity and the interference of light can easily cause too much false report. [0004] Based on video triggers, licenses recognition, only identifying a frame of vehicle images triggered. Ofte...

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.

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