Patent Document ID: 4358189
Application ID: 06160274
Patent Status: 1

Claim One:
1. A photometric sensing module comprising: a portable rigid frame having a camera mount and a plurality of legs diverging away from said camera mount in equally spaced relation to one another such that the divergent ends of said legs are adapted to rest upon a subject plane which is to be photographed, and connecting means in the form of an open frame which provides a free unobstructed view of said subject plane while rigidly interconnecting said legs in equally spaced relation to one another, at least one of said legs being adjustable in length, said connecting means disposed intermediately between said camera mount and said subject plane and defining the angle of view of said camera lens while cooperating with said enclosure means to exclude said camera lens from direct exposure to artificial light within said enclosure means, an artificial light source mounted within said frame, a camera mounted on said camera mount provided with a lens having its optical axis substantially coinciding with the longitudinal axis through said frame equidistant from said legs, enclosure means fully enclosing said frame and said camera lens from direct exposure to external light, said enclosure means provided with an internal light diffusing surface whereby to diffuse the light from said light source evenly over a subject plane upon which the outer divergent ends of said legs rest, fiducial marker means adjacent to the outer divergent end of each leg and located at predetermined, equal distances from said camera mount to represent the outer peripheral limits of each grid segment to be photographed, said fiducial marker means being arranged such that the image of said fiducial marker means is within the field of view of said camera, and means for reflecting each said image onto the camera lens to represent the location of each respective outer divergent end of a leg on the photographic image of the subject plane being photographed.