AUTOMATIC INTERIOR ORIENTATION OF DIGITAL AERIAL IMAGES

A fully operational automatic interior orientation (AUTO__IO) for digi tal aerial images based on a modified Hough Transform for rough locali zation of fiducial marks and least-squares matching for precise measur ement is introduced in this paper. For cameras with fiducial mark iden tification symbols, e.g., as used in Leica RC30 cameras, the program i s capable of determining the orientation of the photos. Results are pr esented using images taken by Leica and Zeiss cameras, which were scan ned on different scanners in various resolutions to demonstrate the po tential and robustness of the automatic lo procedure. AUTO__IO is impl emented on a Helava/Leica DPW770 Digital Photogrammetric Workstation a nd is used in a digital production environment at swissair Photo+Surve ys Ltd., Switzerland.