Vehicle-width measurement method and device based on area-array / linear-array cameras

Abstract

The invention relates to vehicle-width measurement and aims at realizing interference (stain) resistance, high precision and rapid and real-time acquisition of a vehicle width. Therefore, the technical scheme of the invention is a vehicle-width measurement method and device based on area-array / linear-array cameras. The device includes a light-screen frame, two area-array / linear-array CCD cameras, a scatterer, laser transmitters and a PC. The light-screen frame is fixed on the ground. The scatterer is positioned on the ground at the front section of the light-screen frame. The two area-array / linear-array CCD cameras are arranged symmetrically at the top parts of the rear end of the light-screen frame with the midpoint of a laser light screen as the center. Projections of main optical axes of the area-array / linear-array CCD cameras on the laser light screen form inclined angles Alpha with laser beams. A plurality of laser transmitters are evenly arranged on the light-screen frame, vertically above the scatterer. The laser beams transmitted by the plurality of laser transmitters form the laser light screen. The PC receives acquisition images of the CCD cameras. The vehicle-width measurement method and device based on the area-array / linear-array cameras is mainly applied to vehicle-width measurement.

Description

technical field [0001] The present invention is a machine vision measurement method. Specifically, the present invention collects the reflection image of the laser light curtain through an area array or line array camera, processes and analyzes it, and finally obtains a high-precision real-time dynamic measurement method for the width of the measured vehicle. , that is, a vehicle width dimension measurement method and device based on an area scan / line scan camera. technical background [0002] The outer contour size of a vehicle is an important content of vehicle passability parameters and operation safety testing. Overloading of vehicles has become one of the main causes of traffic accidents in recent years, seriously affecting national property and people's lives, and it is also one of the important factors in vehicle production quality. Among them, the measurement of the width of the vehicle is one of the key technologies in the measurement of the outer contour of the ve...

AI Technical Summary

Problems solved by technology

Manual detection has the limitations of large error in detection results, high labor intensity, low efficiency, and inability to complete non-contact automatic measurement. To solve the problems of manual detection, the current commonly used methods mainly include light curtain receiving method and area array camera acquisition method.

The light curtain receiving method uses a group of lasers to vertically project the light curtain onto the surface of the vehicle under test, uses the photoelectric receiver on the ground to receive the laser beam that is not blocked by the vehicle, and measures the width of the vehicle by calculating the number of received beams. This technical solution Although the maximum width of the dynamic vehicle can be obtained, the ground photoelectric receiver is extremely susceptible to the influence of the environment and the dust in the vehicle tires, etc., resulting in errors in the received signal and affecting the measurement accuracy; the area array camera is installed on the top of the vehicle to be tested and Shoot its top view, and finally obtain the vehicle width dimension parameters through the image processing algorithm, but this method is affected by the field of view and angle of the camera, so there is a certain measurement blind spot, resulting in a certain error in the vehicle width dimension

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