Calibration of camera with small FOV and DOF telecentric lens

A variety of camera calibration methods are available from the so-far known literature. But most of them aim at camera with conventional lens, the so-called pinhole camera model. Few attentions have been paid to camera with small field-of-view (FOV) and depth-of-field (DOF) telecentric lens. Therefore an effective calibration method is highly necessary. In this paper a new method is proposed to accurately calibrate a telecentric camera with FOV being only 2.4 mm × 3.2 mm and DOF 0.66mm. At the beginning, a geometric camera model with lens distortion is presented. After that the calibration procedure is described in order to effectively recover the camera intrinsic and extrinsic parameters. The calibration experiment based on this method is conducted, and the results show that the method is quite accurate and reliable.