Abstract
To achieve fast calibration of line structured light sensor, a geometric calibration approach based on single circular calibration target is proposed. The proposed method uses the circular points to establish linear equations, and according to the angle constraint, the camera intrinsic parameters can be calculated through optimization. Then, the light plane calibration is accomplished in two steps. Firstly, when the vanishing lines of target plane at various postures are obtained, the intersections between vanishing lines and laser stripe can be computed, and the normal vector of light plane can be calibrated via line fitting method using intersection points. After that, the distance from the origin of camera coordinate system to the light plane can be derived based on the model of perspective-three-point. The actual experimental result shows that this calibration method has high accuracy, its average measuring accuracy is 0.0451 mm, and relative error is 0.2314%. In addition, the entire calibration process has no complex operations. It is simple, convenient, and suitable for calibration on sites.
Highlights
As a typical representative of noncontact vision measurement technology, the line structured light sensor has a wide application prospect in industry for dimensional analysis, on-line inspection, component quality, and reverse engineering, due to its simple structure, moderate accuracy, fast speed, large amount of information, and other advantage factors [1,2,3,4,5,6]
The sensor consists of one camera and one laser generator, and the laser triangulation is treated as basic principle, so the laser generator is displaced relative to the camera in space
A field geometric calibration method for line structured light sensor based on single circular target is proposed in this paper
Summary
As a typical representative of noncontact vision measurement technology, the line structured light sensor has a wide application prospect in industry for dimensional analysis, on-line inspection, component quality, and reverse engineering, due to its simple structure, moderate accuracy, fast speed, large amount of information, and other advantage factors [1,2,3,4,5,6]. The calibration method that used free-moving planar target has become commonly popular for line structured light sensor [11,12,13,14,15]. This method can obtain high quality calibration images, and reduce the calibration cost. A field geometric calibration method for line structured light sensor based on single circular target is proposed in this paper. The adopted single circular target has the advantages of simple structure and easy processing, and it can be placed free-movingly to capture more higher quality calibration images. The calculation process is not complicated or repeated, the algorithm is simple and fast, and it is flexible, convenient, and suitable for calibration on sites
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