Claims
- 1. A method of imaging documents as they pass a pair of front/rear document-imaging stations where they are illuminated by illumination-means including stable wavelength source means with associated split optical illumination-path means to the front and rear of said passing documents, each said station being arranged to include a pair of illumination-shaping slit means which are offset from one another sufficient to effectively avoid interference between images from the front and rear of a passing document; and operatively associated image-lift means including electronic camera means with an associated optical image-path array; this method comprising:
- providing filter means in this image-path array, which filter means is selected and adapted to shift the received spectrum in the direction of optimum human-eye response; and selecting and arranging said camera means to comprise charge-coupled photo-diode means exhibiting a spectral response close to that of the human eye; and
- arranging each illumination-path means so that the illumination is conducted by the beams, so split, to a respective front and rear side of the documents; and arranging each said path array to further split its illumination beam into two like sub-beams, and to focus at a prescribed point, while also disposing said sub-beams at opposing, equal angles about this point.
- 2. A method of imaging documents as they pass a pair of front/rear document-imaging stations where they are illuminated by illumination-means including stable wavelength source means with associated split optical illumination-path means to the front and rear of said passing documents, each said station being arranged to include a pair of illumination-aperture means which are offset from one another sufficient to effectively avoid interference between images from the front and rear of a passing document; and camera means with an associated optical image-path array; this method comprising:
- providing filter means in this image-path array, which filter means is selected and adapted to shift the received spectrum in the direction of optimum human-eye response; and selecting and arranging said camera means to comprise sensor means exhibiting a spectral response close to that of the human eye; and
- arranging each illumination-path means so that the illumination is conducted by the beams, so split, to a respective front and rear side of the documents; and arranging each said image-path array to further split its illumination beam into two like sub-beams, and to focus at a prescribed point, while also disposing said sub-beams at opposing, equal angles about this point.
Parent Case Info
Which is a Division of application Ser. No. 07/874,876 filed Apr. 28, 1992 now U.S. Pat. No. 5,259,043 which is in turn a Div. of U.S. Ser. No. 07/419,355 filed Oct. 10, 1989 now U.S. Pat. No. 5,155,776.
US Referenced Citations (13)
Divisions (2)
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Number |
Date |
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Parent |
874876 |
Apr 1992 |
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Parent |
419355 |
Oct 1989 |
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Continuations (1)
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960964 |
Oct 1992 |
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