Acta Photonica Sinica, Volume. 42, Issue 11, 1334(2013)
A New Method for Calibrating Line Structuredlight 3D Measurement Model
A machine vision measurement model of line structuredlight was established. Based on the improved camera calibration method, an accurate calibration method of structuredlight plane was proposed. According to the distribution of the structuredlight′s energy along the normal direction of the light′s plane, Gauss fitting method was used to extract the subpixel coordinates of the light stripe′s center point on the image. In the calibration, the local world coordinate system was established on the surface of the freemoving planar target. Then, the local world coordinates of the stripe′s center point, which were obtained by the parameters of the camera calibration, were translated into the camera coordinate system. Using the obtained calibration points on the light plane, the plane of the structuredlight was estimated in the camera coordinate system. The factors that would affect the precision of the measurement model were fully considered in this method, which could achieve a large number of calibration points. From the measurement of standard gauge block and shaft diameter, this method has high precision in practice.
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LI Guannan, TAN Qingchang, KOU Ying, ZHANG Yupeng. A New Method for Calibrating Line Structuredlight 3D Measurement Model[J]. Acta Photonica Sinica, 2013, 42(11): 1334
Received: May. 7, 2013
Accepted: --
Published Online: Dec. 16, 2013
The Author Email: Guannan LI (lign09@mails.jlu.edu.cn)