Rotation Axis Calibration of Laser Line Rotating-Scan System for 3D Reconstruction

The laser line rotating-scan system has been a popular method for 3D reconstruction. But the rotating axis of the scanner usually does not coincide with the camera origin point, which makes this technique a bit more complex. This paper proposes a rotation axis calibration method to solve the problem for more accurate 3D imaging. The calibration parameters are defined as the external parameters (rotation and translation) between the camera coordinate system and the world coordinate system of the rotation axis. With the rotation axis calibration, 3D results of a single frame are transformed into the world coordinate system of the rotation axis. Finally, we realize multi-frame splicing only with the rotation angle provided by the scanner. Experiments on real data show our method is basically correct and practical.