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US 10,054,549 B2Granted
Method and apparatus for automatic measurement of various qualities of printed sheets
AssigneeElectronics for Imaging, Inc.
InventorLuc Choulet
Life of this patent
Estimating the term…
Abstract
Embodiments of the invention relate to the automatic measuring of such qualities of a printed sheet as reflectance excluding specular reflectance, reflectance including specular reflectance, e.g. gloss, transmittance, half-tone coverage, and the like.
Claims6
A computer implemented method for automatic measurement of reflectance, comprising:
- with at least one spectral sensor of a printer, measuring spectral reflectance at a plurality of angles relative to a sheet for each of a plurality of colored patches on said sheet, the colored patches being formed by the printer to enable real time enhancement of a printing process of the printer;
- processing said measurements by a single angle per measurement independently of each other measurement;
- and
- successively positioning an optical commutator to successively select an optical receiver from among a plurality of optical receivers, wherein each optical receiver is positioned at a different angle relative to illumination light rays projected from a light source, said optical commutator directing signals from said selected optical receiver to said spectral sensor for measurement of spectral reflectance.
1 more element
An apparatus for automatic measurement of reflectance, comprising:
- at least one spectral sensor of a printer for measuring spectral reflectance at a plurality of angles relative to a sheet for each of a plurality of colored patches on said sheet, the colored patches being formed by the printer to enable real time enhancement of a printing process of the printer;
- a processor for processing said measurements by a single angle per measurement independently of each other measurement;
- and
- an optical commutator for successively positioning the optical commutator to successively select an optical receiver from among a plurality of optical receivers, wherein each optical receiver is positioned at a different angle relative to illuminating light rays projected from a light source, said optical commutator directing signals from said selected optical receiver to said spectral sensor for measurement of spectral reflectance.
1 more element
Dependencies are inferred from the claim text.