Double monocular white light three-dimensional measuring systems calibration method

Abstract

Disclosed is a calibration method for parameters of a double monocular white light three-dimensional measurement system, which belongs to the field of optical measurement and mechanical engineering. The method adopts a plane calibration board as a known calibration object positioned in the measuring range of the system, and obtains the corresponding projection pixel point of a calibration spot ina left camera and the absolute phase value through processing a structured light fringe image on the calibration board projected by a left slide projector and taken by the left camera, and the corresponding projection pixel point of a calibration spot in a right camera and the absolute phase value through processing the structured light fringe image on the calibration board projected by a right slide projector and taken by the right camera. The method goes on linear calibration to a left and a right single measuring head according to the basic data calibrated by the system to obtain as much initial value of parameters of the measurement system as possible and overall nonlinear optimized calibration to the measurement system based on the linear calibration to obtain the optimized value of all the parameters of the measurement system, thereby realizing the precise calibration of parameters of the double monocular white light three-dimensional measurement system.

Description

Technical field: [0001] The invention relates to a calibration method for a three-dimensional measurement system, in particular to a calibration method for parameters of a dual-monocular white light three-dimensional measurement system using a slide projector. It belongs to the technical fields of optical measurement and mechanical engineering. Background technique: [0002] The traditional camera calibration method is to obtain the calibration basic data by taking a calibration reference object of known size and processing the captured image, so as to realize the calibration of the camera parameters. The basic data of camera calibration establishes the correspondence between the measured coordinate system coordinates of known calibration points and the projected pixel coordinates of calibration points acquired by camera image processing; the traditional calibration method of projectors is to project a calibration pattern of known size, and The coordinates of the calibratio...

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Problems solved by technology

In addition, this method requires the projector to project an additional calibration pattern, which will increase its overall size and production cost for a slide projector

Xiaobo Chen proposed a monocular measurement head using a digital projector in the paper Accuratecalibration for a camera-projector measurement system based on structured lightprojection (Optics and Lasers in Engineering, 2008, doi: 10.1016 / j.optlaseng.2007.12.001) The parameter calibration method, but this method is not suitable for the dual-monocular three-dimensional measurement system using a slide projector, and this method has high requirements for reference calibration objects, which brings inconvenience to calibration

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