Machine vision technology-based laser structured light automatic calibration method

Abstract

The invention discloses a machine vision technology-based laser structured light automatic calibration method. The method comprises steps: 1) a calibration board is firstly placed at a clear imaging position; 2) the calibration plate is adjusted to a horizontal position; 3) the distances between a laser line emitted by the laser and cross marks at two sides of the calibration plate are adjusted tobe the minimum; 4) the laser is closed, a backlight source is opened, camera gains and the exposure time are adjusted, a printer marker on the calibration plate is photographed, and an image 1 is acquired; 5) the laser is opened, the backlight source is closed, a laser spot image is photographed, and an image 2 is acquired; and 6) the image 1 and the image 2 are fused to calculate the intersection point between the rectangular edge line of the calibration plate and the laser line.

Description

technical field [0001] The invention belongs to the field of visual recognition, and belongs to a laser structured light automatic calibration method based on machine vision technology. Background technique [0002] The line-structure laser scanning vision system is an important 3D imaging measurement method. It uses a line-shaped laser to project onto the surface of the object, and then the image sensor receives the laser spot image to complete the measurement process. The key to building a line-structure laser scanning vision system is to calibrate the spatial geometric relationship between the camera and the laser light plane. Duan Fajie et al. from Tianjin University used the tooth-shaped target method, using the laser line to irradiate the tooth-shaped target vertically, and then solved the iterative equation to calculate the perspective parameters of the light plane to complete the calibration. Dewar R uses the filament scattering method, also known as the drawing met...

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Problems solved by technology

[0003] At present, the measurement structure accuracy of the general parameter analysis method laser structure cursor calibration method has low calibration accuracy, complex calculation, low degree of automation and slow speed of the calibration process, which cannot meet the needs of mass production of laser measurement devices; and these calibration methods need to be in accordance with To make a three-dimensional target, the processing technology of the three-dimensional target is complicated. For example, it is very difficult to process a high-precision tooth-shaped target, and it is also difficult to select processing materials. Metal parts are prone to rust when stored for a long time

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