System for distributing and controlling color reproduction at multiple sites
First Claim
1. An apparatus for measuring color of a sample comprising:
- a dual beam spectrograph having first and second inputs, in which said first and second inputs of the spectrograph are capable of receiving light at the same time;
a light source;
first means for transmitting light from said light source to illuminate said sample;
second means for transmitting light from said light source to said first input of said spectrograph to provide a reference for calibrating said spectrograph;
third means for receiving light from said sample and transmitting said received light to said second input of said spectrograph for analyzing the spectrum of said received light; and
one or more sensors which also receive light from said second means independently of said spectrograph in which said sensors provide information for checking the calibration of the spectrograph.
2 Assignments
0 Petitions
Accused Products
Abstract
In the color imaging system, multiple rendering devices are provided at different nodes along a network. Each rendering device has a color measurement instrument for calibrating the color presented by the rendering device. A rendering device may represent a color display in which a member surrounds the outer periphery of the screen of the display and a color measuring instrument is coupled to the first member. The color measuring instrument includes a sensor spaced from the screen at an angle with respect to the screen for receiving light from an area of the screen. A rendering device may be a printer in which the measuring of color samples on a sheet rendered by the printer is provided by a sensor coupled to a transport mechanism which moves the sensor and sheet relative to each other, where the sensor provides light from the sample to a spectrograph. The color measuring instruments provide for non-contact measurements of color samples either displayed on a color display, or printed on a sheet, and are self-calibrating by the use of calibration references in the instrument.
196 Citations
30 Claims
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1. An apparatus for measuring color of a sample comprising:
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a dual beam spectrograph having first and second inputs, in which said first and second inputs of the spectrograph are capable of receiving light at the same time; a light source; first means for transmitting light from said light source to illuminate said sample; second means for transmitting light from said light source to said first input of said spectrograph to provide a reference for calibrating said spectrograph; third means for receiving light from said sample and transmitting said received light to said second input of said spectrograph for analyzing the spectrum of said received light; and one or more sensors which also receive light from said second means independently of said spectrograph in which said sensors provide information for checking the calibration of the spectrograph. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for measuring the color reflected from a sample comprising:
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a light source for illuminating said sample; a line of light in which at least a part of said light represents light of one or more calibration references, and the remaining part of said line represents light received from said sample; and a spectrograph which receives said line of light and outputs spectra spatially related to points along said line, in which part of said spectra is related to said light of said calibration references and provides information for checking the calibration of the spectrograph. - View Dependent Claims (7, 8, 9, 10)
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11. An spectrograph for measuring the spectra of received illumination representing an image comprising:
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at least one reference providing light of one or more wavelengths; an array sensor having two axes in which one of said axes encodes a dimension of space in said image and the other of said axes encodes said spectra representative of points along said dimension of space; and optics for receiving and separating at the same time light from both the received illumination and said reference into spectral components, and imaging said spectral components onto said array sensor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus adaptable for measurement of reflected, transmitted or emitted light of a sample, comprising:
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a dual beam spectrograph having first and second inputs, in which said spectrograph is capable of measuring said first and second inputs simultaneous with one another; a light source capable of illuminating a sample and capable of providing a reference for checking the wavelength calibration of said spectrograph; a first optical path for conveying said light of said source to said sample; a second optical path for conveying said light of said source to said first input of said spectrograph to provide a reference for said measurement; a third optical path for conveying said light reflected, transmitted or emitted from said sample to said second input of said spectrograph for analyzing the spectrum of the light received through said second input; and at least one sensor having spectral sensitivity at one or more wavelengths associated with said light source, in which said sensor is capable of receiving part of the light from the second optical path prior to reaching said first input, said sensor detects light independent of said spectrograph, and said sensor provides information for checking the calibration of the spectrograph. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification