CA2095154A1 - Method and Apparatus for Classifying Articles According to Their Color - Google Patents

Method and Apparatus for Classifying Articles According to Their Color

Info

Publication number
CA2095154A1
CA2095154A1 CA2095154A CA2095154A CA2095154A1 CA 2095154 A1 CA2095154 A1 CA 2095154A1 CA 2095154 A CA2095154 A CA 2095154A CA 2095154 A CA2095154 A CA 2095154A CA 2095154 A1 CA2095154 A1 CA 2095154A1
Authority
CA
Canada
Prior art keywords
color
light
inspected
article
wavelengths
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2095154A
Other languages
French (fr)
Other versions
CA2095154C (en
Inventor
Gilles Allaire
Gratien Beauchemin
Roger Garceau
Bruno Leclerc
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institut National dOptique
Original Assignee
Centre de Recherche Industrielle du Quebec CRIQ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Centre de Recherche Industrielle du Quebec CRIQ filed Critical Centre de Recherche Industrielle du Quebec CRIQ
Priority to CA002095154A priority Critical patent/CA2095154C/en
Priority to US08/073,301 priority patent/US5557414A/en
Priority to AU67181/94A priority patent/AU6718194A/en
Priority to PCT/CA1994/000233 priority patent/WO1994025838A1/en
Publication of CA2095154A1 publication Critical patent/CA2095154A1/en
Application granted granted Critical
Publication of CA2095154C publication Critical patent/CA2095154C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/462—Computing operations in or between colour spaces; Colour management systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/502—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using a dispersive element, e.g. grating, prism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/501—Colorimeters using spectrally-selective light sources, e.g. LEDs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters
    • G01J3/513—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters having fixed filter-detector pairs

Abstract

A method and apparatus for classifying articles according to their color, wherein a first pair of wavelengths is selected on a plurality of light reflection curves in terms of a reflected light wavelength spectrum. An article to be inspected is illuminated with light comprising the first pair of wavelengths and light reflected therefrom is measured to detect light reflection values corresponding to this first pair or wavelengths. A primary signal is produced, which represents either a difference between or a ratio of the detected light reflection values, this signal being indicative of the color of the inspected article. At least one secondary wavelength is selected on the reflected light wavelength spectrum, and the inspected article is illuminated with light comprising this secondary wavelength and light reflected therefrom is measured to produce a secondary signal which is further indicative of the color of the inspected article. A computer provides a classification frame comprising a first pattern consisting of a first and second crossing set of lines respectively defined by mathematical analysis, this classification frame defining a plurality of color classes. The computer classifies the inspected article in one of the plurality of color classes defined by the frame whenever the primary and secondary signals comply with a specific condition. The computer rejects the inspected article whenever the primary and secondary signals do not comply with this specific condition.
CA002095154A 1993-04-29 1993-04-29 Method and apparatus for classifying articles according to their color Expired - Lifetime CA2095154C (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002095154A CA2095154C (en) 1993-04-29 1993-04-29 Method and apparatus for classifying articles according to their color
US08/073,301 US5557414A (en) 1993-04-29 1993-06-08 Method and apparatus for classifying articles according to their color
AU67181/94A AU6718194A (en) 1993-04-29 1994-04-28 Method and apparatus for sensing the color of articles and for classification thereof
PCT/CA1994/000233 WO1994025838A1 (en) 1993-04-29 1994-04-28 Method and apparatus for sensing the color of articles and for classification thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002095154A CA2095154C (en) 1993-04-29 1993-04-29 Method and apparatus for classifying articles according to their color

Publications (2)

Publication Number Publication Date
CA2095154A1 true CA2095154A1 (en) 1994-10-30
CA2095154C CA2095154C (en) 1998-08-04

Family

ID=4151544

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002095154A Expired - Lifetime CA2095154C (en) 1993-04-29 1993-04-29 Method and apparatus for classifying articles according to their color

Country Status (2)

Country Link
US (1) US5557414A (en)
CA (1) CA2095154C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113012156A (en) * 2021-05-10 2021-06-22 南京林业大学 Intelligent solid wood board color classification method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0943058A (en) * 1995-05-23 1997-02-14 Olympus Optical Co Ltd Apparatus for classifying color and apparatus for examining unevenness of color
IT1292369B1 (en) * 1997-06-18 1999-02-08 Sinco Eng Spa METHOD FOR THE RECOGNITION OF COLOR IN CABLE BODIES
JP2018151352A (en) * 2017-03-15 2018-09-27 オムロン株式会社 Optical sensor and sensor system
WO2022163671A1 (en) * 2021-01-29 2022-08-04 富士フイルム株式会社 Data processing device, method, and program, optical element, imaging optical system, and imaging device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206022A (en) * 1961-10-10 1965-09-14 Fmc Corp Color sorting apparatus
USRE29031E (en) * 1972-05-03 1976-11-09 Fmc Corporation Circuitry for sorting fruit according to color
US4057352A (en) * 1976-05-13 1977-11-08 Genevieve I. Hanscom Color grading apparatus utilizing infrared light source
US4146135A (en) * 1977-10-11 1979-03-27 Fmc Corporation Spot defect detection apparatus and method
US4204950A (en) * 1978-02-08 1980-05-27 Sortex North America, Inc. Produce grading system using two visible and two invisible colors
DE3802681C2 (en) * 1987-01-30 1997-01-09 Fuji Photo Film Co Ltd Method for classifying color templates and device therefor
US5000569A (en) * 1988-12-28 1991-03-19 Lamb-Weston, Inc. Light reflection defect detection apparatus and method using pulsed light-emitting semiconductor devices of different wavelengths

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113012156A (en) * 2021-05-10 2021-06-22 南京林业大学 Intelligent solid wood board color classification method

Also Published As

Publication number Publication date
US5557414A (en) 1996-09-17
CA2095154C (en) 1998-08-04

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Legal Events

Date Code Title Description
EEER Examination request