IMPROVING INTERIOR ORIENTATION FOR ASMALL STANDARD CAMERA

Interior orientation (the initial step in comparator-based photogrammetry) requires a set of known photo co-ordinates to act as reference points. Fiducials serve this purpose on large format, metric cameras, as do réseau targets on small format, semi-metric cameras. Most small format cameras, however, have neither fiducials nor a réseau plate. The aim of this study was to establish fiducials in a small standard camera (Pentax 645) so that its imagery could be used for photogrammetric computations. This paper describes two methods of establishing fiducials, followed by a comparison of their stability and suitability for photogrammetric purposes.