Abstract
The geometric calibration of digital aerial camera, including the calibration of inner orientation elements and distortion model parameters, is an indispensable technical of aerial photogrammetry. This paper proposes the use of a focused collimator-array (FCA) device to achieve a stable, repeatable laboratory geometric calibration of digital aerial camera. This device uses multiple collimators and star testers as target generators. After measuring the coordinates of targets on the CCD plane and corresponding standard angles between the collimator optical axis and the principal optical axis, the high-precision geometric calibration of digital aerial camera can be realized according to the geometric calibration model of this paper. Experiment results show that the FCA device can calibrate various types of area digital aerial cameras at different focal lengths and prove the correctness and the reliability of this calibration method using a typical digital aerial camera - Cannon EOS 5D Mark II. This device has good repeatability and high stability, which can satisfy the requirements of digital aerial camera calibration standards.
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