Patent ID: 8452123
Filing Date: 2013-05-28
Classification: G01C,G06T

Abstract:
1. A method for calibrating an interior orientation of optical elements of an imaging instrument with respect to the imaging instrument, to correct for distortions of the optical elements inside the imaging instrument, said distortions corresponding to interior pointing directions with respect to the imaging instrument to be corrected, the method comprising: ortho-rectifying a region of an image acquired by the imaging instrument; co-registering the acquired image with a reference image; correlating the ortho-rectified region of the acquired image with the reference image to measure disparities between the ortho-rectified region of the acquired image and the reference image; determining updated interior pointing directions with respect to the imaging instrument that correct for the disparities measured; adopting a representation of the updated interior pointing directions with respect to the imaging instrument as corrective calibrations for the imaging instrument distortions; and performing the corrective calibrations on the optical elements of the imaging instrument to calibrate the interior orientation of the optical elements with respect to the imaging instrument.