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US 5,513,274 AGranted
Adjusting illumination for image lift to match camera
AssigneeUnisys Corporation
InventorsDavid J. Concannon, John D. Vala, Gerald Banks
Life of this patent
Estimating the term…
Abstract
Arrangement for lifting image of checks, with Xenon lamp, Fluorescent lamp or like source of stable-wavelength-output and CCPD Camera means selected to exhibit "close-to-human" spectral response plus a photopic filter, disposed upstream of the Camera and adapted to shift its received image-light spectrum in the direction of that which is optimal for the human-eye.
Claims6
A document-imaging arrangement including two document-imaging stations, one for the Front, one for the Rear of the documents;
- where a pair of like said illumination-path arrays are provided, one for Front illumination, one for Rear illumination;
- where each said illumination-path array conducts one of the beams so split to a respective Front or Rear side of the documents;
- and wherein each said path array further splits its illumination beam into two like sub-beams, these being directed to focus at a prescribed point, but being disposed at opposing, equal angles about this point;
- and where each said station comprises illumination-shaping slit means;
- the slit means being offset from one another sufficient to effectively avoid interference between Front and Rear illumination means including stable wavelength source means with an associated optical illumination-path array with the beam from said source means is split and sent to illuminate the Front and the Rear of each document advanced past said stations;
- image-lift means including electronic human-response camera means with response essentially that of the human eye and comprising CCPD means and an associated optical image-path array;
- this image path array including filter means adapted to shift the received spectrum toward the wavelengths of optimal camera response.
4 more elements
An arrangement for lifting check images from passing documents, comprising two check-imaging stations;
- one for the Front, one for the Rear of the documents;
- a pair of like said illumination-path arrays, one for Front illumination, one for Rear illumination;
- where each said illumination-path array conducts one of the beams so split to a respective Front or Rear side of the documents;
- and where each said station comprises illumination-shaping slit means;
- the slit means being offset from one another sufficient to effectively avoid interference between Front and Rear illumination;
- illumination-means for said stations including stable wavelength source means in an associated optical illumination-path array;
- where the beam from said source means is split and sent to illuminate the Front and the Rear of each document advanced past said stations;
- and
- image-lift means including electronic camera means, with an associated optical image-path array;
- said camera means being selected to exhibit a prescribed spectral response, plus filter means disposed upstream of the camera means and adapted to shift its received image-light spectrum to be closer to that which is optimal for the camera means.
7 more elements
Dependencies are inferred from the claim text.