Figure 1.
Schematic diagram of line laser double triangle rotation scanning
Figure 2.
Ellipse Fitting
Figure 3.
Symmetrical view of the center of rotation
Figure 4.
Light plane equation
TABLE I.
COMPARISON BETWEEN ROTATION CENTER CALIBRATION METHODS
| 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. |