Calibration method, calibration device and calibration system

Abstract

The invention discloses a calibration method, a calibration device and a calibration system, which are used for position calibration of a visual detection system. The calibration device comprises a laser module, wherein the laser module is lightened, a light beam penetrates through a Fresnel lens to be imaged on an imaging plate, an industrial camera is controlled to complete first photographing,the industrial camera is rotated for an angle, and the industrial camera is controlled to complete second photographing; and pixel coordinates of laser imaging points of two times of photographing arecalculated, so that the relationship between the angle and the pixel is calculated. The calibration method, the calibration device and the calibration system solve the position calculation error caused by installation distance error and lens focal length error of the visual detection system, position calibration is carried out on a plurality of visual detection systems by using one calibration system, and the detection consistency and the measurement precision of each visual detection system can be ensured.

Description

technical field [0001] The invention relates to the field of visual inspection applications, in particular to a calibration method, a calibration device and a calibration system. [0002] technical background [0003] In the optical inspection process of headlights, according to regulations, the light distribution performance of the headlights needs to be measured on a vertical light distribution screen 25m away from the reference center of the headlights. In actual production, lenses are used to control the distance to about 1m. Simulate the imaging at a distance of 25m, and use the method of visual inspection, so as to reduce the floor area of ​​the production line and improve the test efficiency. [0004] The location information uses the angle unit in the car light distribution report, but the pixel unit is used in the camera. We need to find the correspondence between the angle and the pixel. [0005] Due to the processing error and installation error of the equipment, ...

AI Technical Summary

Problems solved by technology

[0006] In order to find the corresponding relationship between the angle and the pixel, that is, to calculate the number of pixel points in the unit of the angle, the present invention provides a calibration method, which solves the problem of using theoretical values ​​to calculate the corresponding relationship between the angle and the pixel of the visual inspection system. Error problem, the present invention can improve the accuracy of the detection results of the visual inspection system and improve the consistency of the detection results of multiple visual inspection systems

Images