Acta Photonica Sinica, Volume. 41, Issue 2, 179(2012)
A Novel Algorithm for Computing the Plane of Line Structured Light in 3D Vision Measurement
A novel algorithm is presented to compute the plane equation of line structured light, which used in a machine vision measurement system. Image subtraction is introduced to obtain stripe image, Steger algorithm is applied to extract sub-pixel level centric points of stripe in the image, and orthogonal line fitting is performed to gain line equation of stripe in image coordinate system. The approach of calculating world coordinates of points on the plane of line structured light from feature points in calibration board is introduced, which are based on the principle of cross-ratio invariance. Finally, orthogonal least-squares plane is proposed fitting to get light plane equation. Some specific optimizations in algorithm are put forward to improve total accuracy, and the scheme design of calibration system and detailed experimental procedure are given. Experimental results demonstrate that the method is of robustness and has high accuracy.
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LIU Ning, LU Rong-sheng, XIA Rui-xue, LI Qi. A Novel Algorithm for Computing the Plane of Line Structured Light in 3D Vision Measurement[J]. Acta Photonica Sinica, 2012, 41(2): 179
Received: Sep. 1, 2011
Accepted: --
Published Online: Mar. 9, 2012
The Author Email: Ning LIU (longredhair@163.com)