Multispectral color image pickup system
First Claim
1. A color image pickup system, comprising:
- an image scanner means for scanning a color image original and having an optoelectronic detector for generating digital pixel signals;
said image scanner means having an electronic editing and digitization means for acquiring said digital pixel signals and for outputting digital pixel signals;
an electronic evaluation means connected to an output of said editing and digitization means for providing black value and white value correction to said digital pixel signals, said electronic evaluation means having an electronic image store;
said image scanner means having a black filter and a plurality I where I>
3 of narrow-band spectral filters having means wavelengths distributed over an entire visible spectral range, means for introducing said spectral filters and said filter into an optical beam path between said color image originals and said optoelectronic detector, and means for substituting for said color image original a structureless white image original;
said image scanner means acquiring digital pixel signals corresponding to a black image pickup, I spectral separations having spectral samples of the color image original distributed over the entire visible spectral range, and I spectral separations having samples of the white image original distributed over the entire visible spectral range for n×
m pixels of the color image original; and
said electronic evaluation means forming for all n×
m pixels calibrated spectral samples from the black image pickup, I spectral separations having spectral samples of the color original, and I spectral separations having samples of the white image original.
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Accused Products
Abstract
A method and apparatus for color stimulus specification-correction, i.e. sensation-correction pickup for scanning of chromatic image originals, referred to in short as a multispectral scanner. A color image pickup system is provided, based on the multispectral principle, the plurality of I>>3 narrow-band spectral filters and one black filter being introduced into the optical beam path of the image scanner, and thus I narrow-band spectral separations of a color image original and of a white image original are registered and digitized. Spectral pixel samples individually calibrated for all pixels are formed with an electronic evaluation unit in pickup real time. These are either stored in I parallel image storage levels or are multiplied by specific coefficients from a table in pickup real time of the signals in three parallel channels and are accumulated in three parallel image storage levels.
31 Citations
13 Claims
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1. A color image pickup system, comprising:
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an image scanner means for scanning a color image original and having an optoelectronic detector for generating digital pixel signals; said image scanner means having an electronic editing and digitization means for acquiring said digital pixel signals and for outputting digital pixel signals; an electronic evaluation means connected to an output of said editing and digitization means for providing black value and white value correction to said digital pixel signals, said electronic evaluation means having an electronic image store; said image scanner means having a black filter and a plurality I where I>
3 of narrow-band spectral filters having means wavelengths distributed over an entire visible spectral range, means for introducing said spectral filters and said filter into an optical beam path between said color image originals and said optoelectronic detector, and means for substituting for said color image original a structureless white image original;said image scanner means acquiring digital pixel signals corresponding to a black image pickup, I spectral separations having spectral samples of the color image original distributed over the entire visible spectral range, and I spectral separations having samples of the white image original distributed over the entire visible spectral range for n×
m pixels of the color image original; andsaid electronic evaluation means forming for all n×
m pixels calibrated spectral samples from the black image pickup, I spectral separations having spectral samples of the color original, and I spectral separations having samples of the white image original. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification