A rapid on-site calibration method for a light pen in monocular vision measurement

Abstract

The invention provides an on-site rapid calibration method of a light pen in monocular vision measurement. According to the on-site rapid calibration method of the light pen, a camera of the system, k (k>=0) auxiliary target spots having the same visual features as target spots of the light pen, and a calibrated object provided with m (m>=2) conical holes with the known interval need to be measured, the camera is used for taking t pictures for the light pen and the k (k>=0) auxiliary target spots freely distributed around the light pen at t (t>=2) different locations, three-dimensional coordinates, differing in one scale factor lambda, of the target spots on the light pen in a coordinate system of the light pen are solved according to the t shot pictures, the calibrated object is placed in an effective view field of the camera, the relative positions of the camera and the calibrated object are kept unchanged, spherical measuring heads of the light pen are put into the ist (i=1,2,..., m) conical hole in sequence, the light pen is made to swing to different l (l>=3) positions around the spherical measuring heads in the conical holes each time, the picture Iir (i=1,2,..., m, and r=1,2,..., l) of each target spot on the light pen is shot with the camera, the total number of the pictures Iir is m*l, the scale factor lambda and the three-dimensional coordinates of the centers of the measuring heads of the light pen in the light pen coordinate system are solved by utilizing the m*l pictures, and the entire process is finished.

Description

Technical field: [0001] The invention relates to measurement system calibration technology, in particular to a rapid on-site calibration method for a light pen in monocular vision measurement, which belongs to the field of measurement and testing. Background technique: [0002] With the continuous development of science and technology and industrial production, there is an increasing demand for on-site measurement of the surface profile and geometric dimensions of large parts. For this reason, the portable light pen measurement technology based on monocular vision has been more and more researched and applied. . The light pen measurement system based on monocular vision mainly includes a visual camera and a light pen. More than three visual target points are arranged on the light pen, and a spherical probe is installed at the end of the light pen. During the measurement, the surveyor holds the light pen, touches the measured target with the light pen probe, and then takes a...

AI Technical Summary

Problems solved by technology

[0004] The invention provides an on-site rapid calibration method for a light pen in monocular vision measurement, which can effectively solve the problem of fast and complete calibration of the light pen at the measurement site

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