Calibration Method for Line-Structured Light

A new calibration method is proposed to address the limitations of the line-structured light calibration method in the existing measurement systems. The proposed method improves the extraction accuracy of feature points by avoiding intersection between the light stripe and chessboard on the target reference, and improves the calibration accuracy by increasing the number of feature points for light plane fitting. The coordinates of feature points in the camera coordinate system arc computed by combining the equation of rays which is formed by the connection of arbitrary feature points at the center of the light strip and the camera center and the plane equation of the target reference, then the coordinates of the center points of two and more strips in the camera coordinate system arc solved. Finally, based on the least square method, the equation of the light plane in the camera coordinate system is obtained based on coordinates of all center feature points of the stripes. Experimental results show that the accuracy and robustness of the proposed method arc superior to those of existing calibration methods.