Speed detection method based on license plate characteristic matching

Abstract

The invention provides a speed detection method based on license plate characteristic matching. The method comprises the following steps of 1) delimiting a first detection area and a second detection area and setting a triggering line; 2) when the triggering line is triggered, carrying out coarse positioning on a license plate area and carrying out identification of true and false; 3) carrying out character segmentation on a positioned license plate and carrying out character identification; 4) storing an identified character sequence and taking as a matching characteristic, and recording a position coordinate of a license plate center and a current frame number; 5) using a character sequence detected in the second detection area to compare with a license plate record in the first detection area, calculating a distance through converting a pixel coordinate into a real coordinate, according to the frame number, acquiring a time difference so as to calculate a speed. The license plate adopted in the invention is served as a characteristic of vehicle matching and a problem that matching precision is insufficient by using a speed measurement method based on characteristic point characteristic matching can be effectively solved. And through recording the license plate characteristic of each area and current position information, an unstable problem existing in multi-vehicle speed measurement can be solved.

Description

technical field [0001] The invention relates to the field of intelligent transportation, in particular to a vehicle speed detection method based on license plate feature matching. Background technique [0002] As the application of video surveillance technology becomes wider and wider, the current traffic system largely relies on video surveillance to obtain traffic information, but the demand for manpower for real-time monitoring will also increase. Seems unrealistic. [0003] The purpose of intelligent transportation is to use computer technology instead of manpower to automatically obtain road conditions, among which the use of computer vision to automatically analyze road surveillance videos is the most feasible method. Vehicle speed has always been a very important traffic information. [0004] At present, ground sensing coils, lasers and radars are mainly used to detect speed on the road, and these technologies have some shortcomings. The speed measurement of the gr...

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Problems solved by technology

[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a vehicle speed detection method based on license plate feature matching, which is used to solve the problem that the vehicle speed detection in the prior art cannot effectively solve the simultaneous detection of multiple vehicles, and the matching accuracy is not high. question

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