Abstract
This report proposes two new different methods for the calibration of an underwater camera system (a protective covering and a camera designed for use in air) and also shows practical examples-an underwater camera system is calibrated according to these two methods. The underwater camera system tested belongs to a type that an usual camera is set in a protective covering with a dome window so as to eliminate the refraction of rays, and it has been developed in U.S.A. Through the calibration of the underwater camera system according to the proposed methods, we investigated not only whether the interior orientation elements could be determined, but also whether it could be used for the analytical underwater photogrammetry. It follows as the result that the precise underwater photogrammetry can be performed with this underwater camera system, when sufficient control points are arranged in the object space.
We are now planning to design a precision underwater camera system (a protective covering with a precise dome window and a precision camera whose interior orientation elements are given as constants) in order to carry out the evaluation of the photographed underwater terrain features in usual plotting instruments with a high accuracy.
