Video-based position detection method for moving vehicles

Abstract

The invention discloses a video-based position detection method for moving vehicles. The detection method comprises two parts: delineating closed electronic fences A and B in positions of a primary conveyor belt and a secondary conveyor belt in a video image respectively, counting the non-zero pixel sum in areas of the electronic fences A and B in real time, forming a 'time-pixel sum' function diagram with time as an abscissa and the pixel sum as an ordinate, detecting the rising edge of the vehicle front entering the electronic fence A and the falling edge of the vehicle rear leaving the electronic fence B according to the function diagram, and controlling start and stop of X-ray emission according to the rising edge and the falling edge. The method has the advantages that the electronicfences are more flexible to set. With adoption of a camera-based video processing manner, the system can intelligently detect positions of the vehicles and ensure better robustness while achieving theequivalent effect of infrared detection. Camera devices are more convenient in equipment maintenance, disassembly, replacement and the like, and the cost is controllable.

Description

technical field [0001] The invention relates to a vehicle security inspection system in the field of radiation imaging, a method for detecting the position of a moving vehicle based on video, which detects the position of a running vehicle to control X-ray emission and start and stop of a trailer conveyor belt. Background technique [0002] In seaports and land border ports, X-ray-based security inspection equipment plays a vital role in public safety and combating smuggling. At present, in the security inspection channel of passenger cars and container vehicles waiting for inspection equipment, the mainstream security inspection systems all use infrared alignment devices. The start and stop control signals of the vehicle dragging the conveyor belt and the X-ray beam output all issue corresponding instructions according to the changes of the infrared induction. [0003] figure 1 It is a schematic diagram of the security inspection channel structure of the traditional passe...

AI Technical Summary

Problems solved by technology

However, under non-ideal conditions, the infrared alignment method mainly has two defects: (1) The anti-interference is not robust enough. During the passing period, the emitted infrared rays are accidentally blocked by irrelevant foreign objects, which will inevitably cause the control signal to be interrupted. Mis-launch; (2) The flexibility of the device is not enough. Once the infrared device is installed on a fixed position of the security door, it will be troublesome to move the position, disassemble and maintain it.

Images