Spectrometer apparatus for calibrating color imaging apparatus

Details Spectrometer apparatus for calibrating color imaging apparatus Spectrometer apparatus for calibrating color imaging apparatus

1992-08-24

1994-04-12

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356404, 358509, G01J 328, H04N 146

Patent

active

053030281

ABSTRACT:
Spectrometer apparatus for calibrating a color image scanner includes an opaque member, having an optical slit, movable into position on an optical axis of the scanner between its polychromatic light source and its lens in a plane occupied by a color image when it is scanned. A diffraction grating is similarly movable onto the optical axis between the slit and the lens. By having the grating in proximity to the slit, the opaque member and the grating can be part of a single assembly that can be easily moved into the optical axis in a convenient location near the scanning plane of the image scanner. The light source illuminates the slit and the diffraction grating disperses duplicate spectra off-axis across respective halves of the image sensor, from which data is obtained for calibration.

REFERENCES:
patent: 3664741 (1972-05-01), Bonnet et al.
patent: 4285596 (1981-08-01), Landa
patent: 4820048 (1989-04-01), Barnard
patent: 4898467 (1990-02-01), Milch

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