A Study on Precision of Calibration Results of a Non-Metric Digital Camera

概要

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Although many camera calibration methods for a non-metric digital camera have been proposed, there are few reports on precision of calibration results. Therefore, we conducted a field experiment to examine precision of calibration results. We adopted a calibration method using a set of calibration points distributed on the 2-D plane. A round of camera calibration utilized a set of eight convergent images acquired from eight different directions with four different camera frame rotation angles of 0°, +90°, +180° and -90° around the optical axis of the camera. 32 rounds of camera calibration for each camera were conducted. Moreover, a numerical simulation of 3-D measurement using the obtained image distortion model was carried out to investigate the influence of the difference between the obtained image distortion models. Experimental results indicated that dispersions of image distortions between obtained image distortion models cannot be neglected. Difference of image distortions may make more than twenty times larger errors at 3-D measurement without an exterior orientation. The most part of the difference between estimated image distortions was the difference of the estimated position of the principal point, while the differences of another components of the image distortion model were small enough to be negligible.
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