title: Stereophotogrammetry marking and serializing: a simple technique.
abstract: A relatively simple, inexpensive, and yet exact, binary code data-back-fiducial marking system may be added to any existing camera by the use of LED illumination of the back of the film through precisely aligned holes in the focal plane pressure plate.
mesh_terms: D003626:Data Display; D010780:Photogrammetry / Q000295:instrumentation / Q000379:methods*; D010781:Photography / Q000379:methods*