Identification of image-forming material type
AssigneeEastman Kodak Company
InventorRichard Arthur Sharman
Life of this patent
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Abstract
Described herein is a method and apparatus for identifying image-forming material type, particularly photographic material types. The method comprises illuminating a sample of the material at a plurality of wavelengths and measuring the density at each of these wavelengths. The set of density values obtained are then used to determine the slope of the cyan dye curve between the magenta and cyan peaks. This slope can then be compared to data to identify the material.
Claims21
A method of identifying image-forming materials, the method comprising the steps of:
- illuminating a sample of image-forming material with a radiation source operating at a plurality of wavelengths;
- measuring a parameter proportional to the sample density of the material at a plurality of wavelengths between and including two adjacent peaks of dye absorbency curves for the material;
- calculating the individual dye absorbencies at each wavelength;
- calculating the ratios of the individual dye absorbencies;
- and
- comparing the calculated ratios with reference data to determine the type of image-forming material.
Apparatus for identifying image-forming materials from a sample, the apparatus comprising:
- illumination means for illuminating the sample at a plurality of wavelengths;
- detector means for detecting radiation received from the sample and providing an output signal proportional to the sample density of the material at a plurality of wavelengths between and including two adjacent peaks of dye absorbency curves;
- processing means for calculating the individual dye absorbencies at each wavelength;
- calculating the ratios of the individual dye absorbencies;
- and
- comparing the calculated ratios with reference data to determine the type of image-forming material.
Dependencies are inferred from the claim text.