A rapid on-site calibration method for a light pen in monocular vision measurement
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A technology of monocular vision and calibration method, applied in the field of measurement and testing, to achieve the effect of improving accuracy and stability and wide application range
Active Publication Date: 2016-04-27
SHANXI ZHIDIAN TECH CO LTD
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[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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[0026] Please refer to figure 1 and figure 2 As shown, the light pen on-site rapid calibration method proposed by the present invention only needs the camera of the monocular vision measurement system itself, k (k ≥ 0) auxiliary target points, and one with m (m ≥ 2) conical holes (such as figure 2 The calibrators of label 4) in (such as figure 2 Mark 3) in , wherein the calibration object can be a square rod or a flat plate, and the spacing of the m conical holes on it is known. as figure 1 and figure 2 As a specific embodiment shown in , the light pen uses 8 active luminous infrared LED point light sources as visual target points to meet the measurement needs of large-scale workpieces. The 8 target points on the light pen are roughly distributed in the same plane, and the calibration object used for the light pen calibration is a calibration ruler with 3 conical holes with known spacing.
[0027] First, k (k≥0) auxiliary target points with the same visual characteris...
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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...
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