Abstract
The existing calibration methods of line-structured light system have complicated calibration procedures. To address this issue, this paper presents a practicable calibration method based on a homography matrix. In this calibration method, it does not need the camera calibration as well as the light plane calibration. First, a sequence of the light-stripe images and sinusoidal fringe images are obtained at different positions moved by a translation stage. Second, a series of feature points located at the light plane will be extracted from these images. Then, a homography matrix, which is to map the relationship between the light plane and the image plane, can be calculated. The three-dimensional (3D) data of a tested object can be restored by this matrix after extracting the image coordinates of the light-stripe images. The experimental results have shown its feasibility and validity. Moreover, the entire calibration process is practicable to simplify the experimental procedures and easy to be applied in industrial inspection.
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