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A European Network on Digital Camera Calibration

Background The need of a camera calibration is a fundamental requirement in the context of photogrammetric data processing. For airborne sensors this calibration is typically realized under well controlled laboratory conditions. In this case, special calibration devices are used to determine the internal camera characteristics with sufficient accuracy. Using such calibration facilities, the distortion parameters of the lens in use, are estimated based on the computed obtained discrepancies between measured coordinates or angles and their a priori known values. In addition, the focal length and principle point coordinates are chosen to minimize the absolute amount of lens distortions and to realize a symmetric distortion pattern.