Measurement and Precision Analysis of Exterior Orientation Element Based on Landmark Point Auxiliary Orientation

Abstract

Obtaining the interior and exterior orientation elements and distortion parameters of camera is critical in the applications of photogrammetric survey and computer vision on recovering object position and angular orientation. While being used outside as supervision devices monitoring objects in the air, cameras are generally installed in non-calibration designated regions with high erection and elevation postures within their view distance over the sky. Therefore, it is really hard to obtain the exterior orientation element of camera. In order to solve this problem, this paper proposed a method to obtain the exterior orientation element of camera outdoors by applying landmark point auxiliary orientation and to obtain the interior and exterior orientation elements and distortion coefficient of camera by using self-check bundle adjustment in indoor three-dimensional control field. Thus, the transformational relations between the landmark points of different positions could be calculated according to the method of landmark point auxiliary orientation. The exterior orientation elements of camera could be recovered through transformational relations, and the position and posture of recovered camera in outdoor non-calibration designated field could be simulated accordingly. The experiential results show that the exterior orientation elements of camera can be effectively recovered through the method of landmark point auxiliary orientation while certain high intersection precision can be maintained.