Patent ID: 6122078
Filing Date: 2000-09-19
Classification: G01C,H04N

Abstract:
A photogrammetric apparatus comprising:a planar object to be scanned for digital storage;a reseau to be imaged simultaneously with the planar object;light source means for producing light and simultaneously illuminating said planar object and said reseau with said light;reseau photoreceptor means for converting an image of the reseau focussed thereon to reseau electrical signals;planar object photoreceptor means distinct from said reseau photoreceptor means for converting an image of the planar object focussed thereon to object electrical signals;optic means for focussing said light produced by said light source means when said light source means is simultaneously illuminating the reseau and the planar object to form images of the reseau onto the reseau photoreceptor means and images of the planar object onto the planar object photoreceptor means;first support means for maintaining the planar object and reseau in fixed parallel relationship; andsecond support means for maintaining the reseau photoreceptor means, the planar object photoreceptor means, and the optic means in fixed relationship whereby an aspect of the reseau is out of focus with respect to the planar object photoreceptor means but in focus with respect to the reseau photoreceptor means, and an aspect of the planar object is out of focus with respect to the reseau photoreceptor means but in focus with respect to the planar object photoreceptor means, when said light source means is simultaneously illuminating the reseau and the object image.