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Slit-light Laser Range Finding Using Perspective Warping Calibration  

Ahn, Hyun-Sik (동명대학교 로봇시스템공학과)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.11, no.3, 2010 , pp. 232-237 More about this Journal
Abstract
In this paper, a slit light laser range finding method using perspective warping calibration is proposed. This approach has an advantage to acquire relatively high accuracy, although the optical system is nonlinear. In the calibration, we detect the calibration points which are marked on the calibration panel and acquire the center position of the slit light laser in the image, which are used for computing the real positions of the slit light by using perspective warping. A calibration file is obtained by integrating the calibration data with the transition of the panel. The range data is acquired by interpolating the center position of the slit light laser to the calibration coordinates. Experimental results show that the proposed method provides the accuracy of 0.08mm error in depth range of 130mm with the low cost optical system.
Keywords
Laser range finding; Calibration; Triangulation principal; Slit-light range finding; Sub-pixel interpolation;
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