<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Line lasers are of great significance in many fields such as industrial inspection, machine vision, cultural relics identification, mechanical design, and medical oral cavity. The three-dimensional reconstruction of the line laser can accurately obtain the three-dimensional information of the surface of the object, and quickly complete the three-dimensional contour reconstruction of the object to be tested. In the online laser rotation scanning, the object rotates around a certain point, which is a rotation center, and the calibration of the rotation center is the main factor that restricts the accuracy of the three-dimensional contour. At present, the calibration of the center of rotation is mainly obtained by the characteristics of a circle (ball, cylinder, cone, etc.). This paper mainly introduces the basic process of rotating scanning, rotating center, and rotating methods as well as their advantages and disadvantages. First, the basic process of rotating scanning is briefly introduced. Secondly, the definition and content of the rotating center are introduced. Then, the calibration methods of three rotating centers (ellipse fitting method, symmetry method, plane fitting method) are introduced. Finally, the advantages and disadvantages of the three calibration methods and their respective applications are summarized.</p>
</abstract>

Line lasers are of great significance in many fields such as industrial inspection, machine vision, cultural relics identification, mechanical design, and medical oral cavity. The three-dimensional reconstruction of the line laser can accurately obtain the three-dimensional information of the surface of the object, and quickly complete the three-dimensional contour reconstruction of the object to be tested. In the online laser rotation scanning, the object rotates around a certain point, which is a rotation center, and the calibration of the rotation center is the main factor that restricts the accuracy of the three-dimensional contour. At present, the calibration of the center of rotation is mainly obtained by the characteristics of a circle (ball, cylinder, cone, etc.). This paper mainly introduces the basic process of rotating scanning, rotating center, and rotating methods as well as their advantages and disadvantages. First, the basic process of rotating scanning is briefly introduced. Secondly, the definition and content of the rotating center are introduced. Then, the calibration methods of three rotating centers (ellipse fitting method, symmetry method, plane fitting method) are introduced. Finally, the advantages and disadvantages of the three calibration methods and their respective applications are summarized.

Rotation center calibration based on line laser rotating platform

International Journal of Advanced Network, Monitoring and Controls

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Rotation center calibration based on line laser rotating platform"}

Line lasers are of great significance in many fields such as industrial inspection, machine vision, cultural relics identification, mechanical design, and...

calibration method	Advantage	Disadvantage	Applicable situation
Ellipse fitting method	It can reduce the error in the measurement process with high precision.	During the fitting process, the number of iterations is variable and it takes a lot of time.	Due to interference of factors such as position and angle, the extracted edge contour is elliptical. Or the calibration block is elliptical.
Symmetry method	The principle is simple and easy to understand, and the accuracy is high.	It is necessary to select multiple locations for testing, and to obtain an average value, which takes a lot of time.	Suitable for circular rotating platforms. Or a circular calibration block. The point cloud obtained by scanning has higher precision.
Plane fitting	The operation is simple, no need to manually paste the mark points, and the speed is fast.	The accuracy is low.	Suitable for circular rotating platforms. Or a circular calibration block.

Rotation center calibration based on line laser rotating platform

Published Online: Sep 25, 2019

Page range: 48 - 52

DOI: https://doi.org/10.21307/ijanmc-2019-033

Keywords
Line laser, rotary scanning, Rotation center, calibration

© 2019 Lei Doudou et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Figure 2.

Figure 3.

Figure 4.

COMPARISON BETWEEN ROTATION CENTER CALIBRATION METHODS

Rotation center calibration based on line laser rotating platform

Published Online: Sep 25, 2019

Page range: 48 - 52

DOI: https://doi.org/10.21307/ijanmc-2019-033

KeywordsLine laser, rotary scanning, Rotation center, calibration

© 2019 Lei Doudou et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Figure 2.

Figure 3.

Figure 4.

COMPARISON BETWEEN ROTATION CENTER CALIBRATION METHODS

Keywords
Line laser, rotary scanning, Rotation center, calibration