WO2001016990A1 - Dispositif colorimetrique automatise a balayage - Google Patents

Dispositif colorimetrique automatise a balayage Download PDF

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Publication number
WO2001016990A1
WO2001016990A1 PCT/US2000/023747 US0023747W WO0116990A1 WO 2001016990 A1 WO2001016990 A1 WO 2001016990A1 US 0023747 W US0023747 W US 0023747W WO 0116990 A1 WO0116990 A1 WO 0116990A1
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WO
WIPO (PCT)
Prior art keywords
color
color sensor
carriage
path
feed
Prior art date
Application number
PCT/US2000/023747
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English (en)
Other versions
WO2001016990A9 (fr
Inventor
David R. Bowden
Larry Davis
Victor Iseli
Mark Malson
Long Sam
Karl Seibert
Michael Vrhel
James Mark Geeves
Original Assignee
Color Savvy Systems Limited
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 Color Savvy Systems Limited filed Critical Color Savvy Systems Limited
Priority to AU74715/00A priority Critical patent/AU7471500A/en
Publication of WO2001016990A1 publication Critical patent/WO2001016990A1/fr
Publication of WO2001016990A9 publication Critical patent/WO2001016990A9/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
    • H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis

Definitions

  • the present invention relates to a color measurement device; and more particularly to an automated scanning color measurement device for printer calibration, profiling and process control.
  • Color management systems seek to replace the old add-hock practices with an open, cross-platform standard method of communicating color information as accurately as possible, within the limitations of the devices used, throughout the reproduction process. If properly implemented, a color management system eliminates multiple iterations of proofing and re-scanning, allows easy re-purposing of color files for different types of output, and attaches an unambiguous color meaning to each piece of color information in a respective document. It can save time and money, and open up new workflows that would have previously been impossible.
  • RGB red, green, blue
  • CMYK cyan, magenta, yellow, black
  • Device-specific color spaces represent color using numerical values that indicate the amount of each color a device uses to produce the color.
  • RGB colors may indicate the signal strength generated by a scanner as a sensor when it records light through the red, green, and blue filters, or may represent the voltage sent to the guns that excite the monitors red, green, and blue phosphers.
  • CMYK colors specify the amount of each ink laid down to produce a particular color. The problem is that the same RGB or CMYK values will produce a different color on different devices. To keep the color consistent across different devices that use different color spaces, a color management system transforms the device-specific RGB or CMYK values to produce the correct color on each device.
  • Calibration reduces the production of non-sellable product by maintaining color consistency from job to job, from one day to the next.
  • RIP raster image processors
  • printers could produce excellent color output, but tend to drift over time, causing consistency problems for users.
  • Most software and hardware RIPs now come with some type of calibration-linearization program. The purpose of these calibration routines is to allow user to compensate for changes for in print quality related to temperature, humidity, toner-ink, paper and use over time.
  • a calibration routine contains a test target, which usually consists of about twenty color patches that range from 0% up to 100% ink coverage for each ink color that the printer uses (i.e. a 4-color printer would consist of 80 patches).
  • a test target usually consists of about twenty color patches that range from 0% up to 100% ink coverage for each ink color that the printer uses (i.e. a 4-color printer would consist of 80 patches).
  • the customer After printing the calibration target, the customer must utilize a sensor device, such as the device described in U.S. Patent No. 6,020,583 to Wallowit, et al., to generate the density values for each of the color patches printed on the test target. These values are then directly entered into the RIP calibration routine.
  • the calibration software allows the user to compare the data from previous calibrations to the calibration data that was just entered. The customer then determines, by viewing a chart, if the printer has drifted or needs to be calibrated.
  • a similar process will be utilized when building a device profile for a printer.
  • the printer is used to print a target containing known device-specific values (usually CMYK or CMY, though former quoters are RGB devices and some inkjet printers act as RGB devices).
  • CIE values of the printer results are measured using a spectrophotometer or colorometer, such as the sensor disclosed in U.S. Patent No. 6,020,583.
  • Printers and presses are significantly challenging to profile. Conventionally, hundreds or thousands of target patches must be analyzed in building the profile. If done by hand utilizing the sensor disclosed in U.S. Patent No. 6,020,583, for example, such a profiling operation would take an extraordinary long time since each patch must be tested individually.
  • the present invention provides an automated scanning color measurement device utilizing the sensor technologies disclosed in U.S. Patent No. 6,020,583.
  • the device includes a tray for receiving a target sheet having a plurality of color patches printed thereon and sheet feeding mechanisms for carrying the sheet into the apparatus where the patches are automatically scanned by a color sensor cartridge, reciprocatable along the width of the sheet, to take colorometric, densitometric, and/or spectrophotometric readings of the color patches.
  • the device transmits such readings to a host computer or some other associated device for performing calibrations and/or building profiles on the device (such as a printer) that created the patches applied to the target sheet.
  • One aspect of the present invention provides an apparatus for automatically collecting a plurality of color readings from a corresponding plurality of color patches applied to a sheet, and for transmitting the plurality of color readings to a host computer.
  • the apparatus includes: a color sensor mounted on a carriage motorized for reciprocation along a predefined carriage path; a feed for feeding the sheet along a predefined feed path, where an exposed portion of the feed path runs in a direction substantially perpendicular to at least a sensing portion of the carriage path, and where the exposed portion of the feed path is substantially adjacent to the sensing portion of the carriage path to allow the color sensor to sense colors applied to the sheet fed to the exposed portion of the feed path, along the entire sensing portion of the carriage path; a carriage control for controlling the position of the color sensor along the sensing portion of the carriage path; a feed control for controlling the position of the sheet along the feed path; an interface for providing a data link to a host computer; and a microcontroller operatively coupled to the carriage control, the feed control, the color
  • the color sensor includes: a color sensor housing; a plurality of LEDs mounted within the color sensor housing, each emitting light of a substantially different wavelength band spaced in a visible spectrum; a reference photodetector mounted within the color sensor housing; a sample photodetector mounted within the color sensor housing; a reflector positioned in a first optical path between the reference photodetector and the plurality of LEDs and adapted to direct a first portion of light emitted by each of the LEDs to the reference photodetector; an aperture in the color sensor housing positioned in a second optical path between the sample photodetector and the plurality of LEDs, where the second optical path is closed upon the aperture being positioned adjacent to the sheet; and a controller, operatively coupled to the reference photodetector, the sample photodetector and the plurality of LEDs, adapted, upon activation, to successively activate the LEDs, either alone or in combination, and to provide a color sensor output based upon a ratio of readings taken
  • the reflector is an optical coating applied to either the color sensor housing an object (such as a circuit board) mounted in the color sensor housing, wherer the optical coating provides a substantially non-absorbing, integrating surface on color sensor housing or object.
  • the optical coating is preferably a white coating such as a white silk-screen.
  • the color sensor includes: an interface panel including a plurality of leads operatively coupled to the controller; a first circuit board coupled to the interface panel and including the reference photodetector mounted on a top surface thereof, the sample photodetector mounted on a bottom surface thereof, and a plurality of holes extending through the circuit board and distributed around the sample and reference photodetectors; and a second circuit board coupled to the interface panel and positioned over the first circuit board, where the second circuit board includes the plurality of light-emitting diodes mounted to a bottom surface thereof, and where each of the LEDs extending at least partially through respective ones of the plurality of holes in the first circuit board, and where the second circuit board further includes the optical coating applied to the bottom surface thereof.
  • the interface panel is preferably adapted to be retrofit on a printer carriage of a conventional ink-jet printer.
  • the interface is a universal serial bus (USB) interface and the apparatus further comprises a USB controller operatively coupled between the microcontroller and the USB interface.
  • the interface is a network interface and the apparatus further comprises a network controller operatively coupled between the microcontroller and the network interface.
  • the network interface may be a TC/PIP network interface
  • the network controller may be a TC/PIP controller
  • the network controller may include its own IP address, so that the apparatus is capable of interface with a host computer over the Internet.
  • the apparatus includes a calibration plate mounted adjacent to a calibration portion of the carriage path, and the microcrontoller circuitry and/or programming is adapted to operate the carriage control so that the color sensor is exposed to the calibration plate during a calibration procedure for the color sensor.
  • the method includes the steps of: (1) providing a device including a color sensor mounted on a carriage motorized for reciprocation along a predefined carriage path, and a feed for feeding the sheet along a predefined feed path, where an exposed portion of the feed path runs in a direction substantially perpendicular to at least a sensing portion of the carriage path, and where the exposed portion of the feed path is substantially adjacent to the sensing portion of the carriage path to allow the color sensor to be directed to the sheet fed to the exposed portion of the feed path, along the entire sensor portion of the carriage path; (2) controlling the carriage and feed so that the color sensor is separately exposed to at least a set of the color patches applied to the sheet; (3) for each separate exposure during the controlling step, activating the color sensor to obtain a color reading for the particular color patch; and (4) transmitting data corresponding to the color reading to a host computer operatively coupled to the
  • the color sensor will perform the following steps: (a) activating at least one light source, the light source emitting light of a wavelength band; (b) directing a first portion of the light emitted by the light source to a reference photodetector; (c) directing a second portion of the light emitted by the light source to an aperture adjacent to the color patch; (d) directing light reflected from the color patch to a sample photodetector; (e) calculating a ratio of readings taken from the reference photodetector and the sample photodetector; and (f) deriving the color reading from the ratio.
  • steps (a) through (e) are repeated for at least three light sources, each emitting light of a substantially different wavelength, where the color reading derived in step (f) is derived from the ratios calculated in step (e) for the at least three light sources.
  • the method includes the steps of providing at least one calibration plate in a position adjacent to a calibration portion of the carriage path, controlling the carriage and feed so that the color sensor is exposed to the calibration path, activating the color sensor to obtain a color reading for the calibration plate, and calibrating the color sensor using, at least in part, the color reading taken for the calibration plate.
  • the method includes the steps of controlling the carriage and the feed so that the color sensor is positioned adjacent to an encoded patch applied to the sheet; activating the color sensor on the encoded patch applied to the sheet; extracting information from the color sensor readings obtained from the encoded patch by the color sensor, where the information pertains, at least in part, to locations of color patches on the sheet; and performing the step of controlling the carriage and feed so that the color sensor is separately exposed to at least a set of the color patches applied to the sheet, in accordance with, at least in part, the information extracted from the encoded patch.
  • the method further includes the steps of receiving from the host computer information pertaining to locations of color patches on the sheet, and performing the step of controlling the carriage and feed so that the color sensor is separately exposed to at least a set of the color patches applied to the sheet, in accordance with, at least in part, the information received from the host computer.
  • Fig. 1 is a perspective view of an automated scanning color measurement apparatus according to a preferred embodiment of the present invention
  • Fig. 2 is a schematic diagram of the sensor carriage and paper feed mechanisms of the embodiment of Fig. 1;
  • Fig. 3 is a block diagram of the various mechanical and electrical components of the preferred embodiment of the present invention.
  • Fig. 4a is an exploded perspective view of the color sensor utilized by the automated scanning color measurement apparatus according to a preferred embodiment of the present invention.
  • Fig. 4b is another exploded perspective view of the color sensor utilized by the automated scanning color measurement apparatus according to a prefened embodiment of the present invention.
  • the present invention is an automated scanning color measurement apparatus utilizing the sensor technologies disclosed in U.S. Patent No.6,020,583 ("the '583 Patent”), the disclosure of which is incorporated herein by reference.
  • the apparatus 10 includes a tray 12 for receiving a target sheet 14 having a plurality of color patches 16 printed, or otherwise applied thereon, and sheet feeding mechanisms 17 for carrying the sheet 14 upwards into the apparatus where the patches 16 are automatically scanned by a color sensor cartridge 20 to take colorimetic, densitometric and/or spectrophotometric readings of the color patches.
  • the device 10 will transmit such readings to a host computer or some other associated device operatively coupled to the apparatus.
  • the present embodiment is a conventional ink-jet printer, such as a Hewlett Packard DeskJet 420C printer, in which the ink jet cartridge and control circuitry have been removed and replaced with a color sensor cartridge 20 (described below) and associated control circuitry for controlling the color sensing operation (also described below).
  • the paper feed mechanics 17, printer carriage 21 and associated mechanics remain but are now controlled by the new control circuitry.
  • the interface to the device is preferably no longer the parallel (IEEE-1284) interface but both serial RS-232 and USB configured in an either/or fashion. To operate, the user simply places the sheet 14 with the color patches 16 into the input tray 12 of the apparatus 10 and presses one of the buttons 18 to begin the scanning operation.
  • the new control circuitry controls the feed mechanics 17 to position the target sheet 14 at a vertical orientation with respect to the sensor cartridge 20 and controls the carriage 21 to position the sensor cartridge at a horizontal orientation with respect to the width of the sheet.
  • the new control circuitry controls the feed mechanics and the carriage such that the sensor cartridge 20 is positioned one of the patches on the target sheet 14.
  • the new control circuitry activates the color sensor housed in the sensor cartridge to obtain a color reading for the patch.
  • the new control circuitry controls the feed mechanics and the carriage such that the sensor cartridge 20 is positioned a next one of the patches on the target sheet 14; after which, the new control circuitry activates the color sensor housed in the sensor cartridge to obtain a color reading for the next patch.
  • the device-independent data corresponding to the color patches 16 present on the printed color target 14 are transmitted via the RS-232 and/or USB interfaces to a host computer or the like.
  • the new control circuitry (including software) 56 is operatively coupled to the color sensor cartridge 20 via data link 57, the motor control circuitry 58 controlling the paper feed (stepper) mechanisms 17 and the carriage (servo) mechanisms 21 via data link 59, the universal serial bus (USB) interface 60 via data link 61, the serial interface 62 via data link 63, and the front-panel human-interface buttons and LEDs 18, 19 via data link 64.
  • the motor control circuitry 58 utilizes feed back from the linear encoder 65 in controlling the horizontal position of the color sensor cartridge 20.
  • the new control circuitry 56 includes a microcrontroller 66, associated program/data memory 68 and a USB controller 70.
  • the color sensor cartridge 20 includes a cartridge housing 22 having an interface panel 24 for interfacing the electronic circuits and devices of the color sensor cartridge with data link 57, operatively coupled to the new control circuitry 56.
  • the panel 24 includes a plurality of leads 26 operatively coupled by connectors 28 to associated leads on three circuit boards 30, 32 and 34.
  • the anangement of leads is preferably configured so that the color sensor cartridge 20 may be retrofit directly on a carriage 21 of an existing ink jet printer.
  • the color sensing cartridge further includes a plurality of light-emitting diodes (LED's) 36 (not all shown), where each of the LED's emit light of a substantially different wavelength band spaced in the visible spectrum; a reference photo detector 38; a sample photo detector 40 an optical coating applied to the lower side 42 of the circuit board 32 (acting as an optical cap) for directing a first portion of light emitted by each of the LED's to the reference photo detector 38; a reflector cone 44 for directing a second portion of the light emitted by the LED's to the paper 14; and a receptor piece 46 for directing the diffuse portion of the light reflected from the paper 14 to the sample photo detector 40.
  • LED's light-emitting diodes
  • the silk-screened, white coating on the lower-most side 42 of the circuit board 32 provides a non-absorbing integrating surface directly over the LED's such that a portion of the light generated by the LED's reflects off this integrating surface to the reference photo detector 38.
  • the LED's are each mounted to the circuit board 32 and extend downward partially through annular holes 48 bored though the circuit board 34. The portions of the LED's 36 extending through the circuit board 34 extend into cylindrical channels 50 bored axially through the receptor piece 46.
  • the reflector cone 44 includes an inner, conical reflecting surface, positioned in alignment with the cylindrical channels 50 and angled at 22.5° with respect to the cylindrical channels such that the sample portion of the light directed downwards through the cylindrical channels will reflect off the conical reflecting surface and be directed towards the focal aperture 52 and paper 14 at an angle of 45°. Light reflected from the paper 14 will reflect back through the focal aperture 52 in the optical cap 44 through the cylindrical channel 54 extending axially through the receptor piece 46 to the sample photo detector 40.
  • the on-board LED controls 70 (see Fig. 3) will cause each of the LED's (either alone or in combination) to be successively activated and a reflectance measurement for the particular color patch 16 will be provided based upon a ratio of the output from the sample photo detector 40 and reference photo detector 38.
  • An A/D converter 72 (see Fig. 3) converts the analog signals from the sample and reference photo detectors 40, 38 into digital data acceptable by the new control circuitry 56. The above reflectance method is described in detail in The '583 Patent.
  • the color sensor cartridge is self contained and removable, other sensor cartridges may be provided so that the apparatus 10 may be easily integrated with other equipment installed on the carriage 21.
  • the three buttons 18 provided on the chassis include a Calibrate/Cartridge Change button, a Measure/Move Paper button and a Power button.
  • a peripheral device such as a printer
  • the user may follow the following simple steps. First, the user will define a profile name for the peripheral device using the support software resident on the host computer operatively coupled to the apparatus 10. Next, the user will print a test sheet 14 using the peripheral device where the test sheet preferably includes a plurality of patches 16 of different and varying colors, as will be apparent to those of ordinary skill in the art. Next, the user inserts the test sheet in the paper tray 12 of the device and presses the "Measure" button.
  • the sheet 14 is taken into the device 10 and the patches 16 are automatically scanned by the sensor cartridge 20 contained therein.
  • the device transmits the sensor readings for each of the color patches 16 to the host computer where the resident software extracts the data from the messages sent by the device and creates a profile, which is then saved under the profile name created above.
  • Conventional profiling software capable for use with the present invention includes the Fiery® Print Calibrator (Fiery is a registered trademark of Electronics for Imaging, Inc.).
  • a set of calibration plates 72 are positioned within the chassis of the apparatus 10 in a position along the carriage path so that the sensor cartridge 20 is capable of being placed before the calibration plate 72 during a calibration operation.
  • a non-reflecting "black” calibration plate and a reflecting diffuse “white” calibration plate are provided in the apparatus 10 along the carriage 21 path.
  • the carriage 21 will transport the sensor cartridge to before the calibration plate(s) 72 mounted within the chassis of the apparatus 10.
  • the calibration will take place in accordance with the steps described in The '583 Patent.
  • the new control circuitry 56 is adapted to perform a complete profiling operation of a peripheral device.
  • the new control circuitry 56 is configured to produce an ICC profile directly after measuring an "n" number of patches 16.
  • the software in the new control circuitry 56 includes conventional edge detection algorithms, where opposing LED's 36 of the sensor cartridge 20 are used to detect edges of patches 16 or edges of the paper 14.
  • a less accurate detection algorithm can be used with a single LED 36.
  • a bar-coded type patch 74 (see Fig. 2) be provided where information in the bar-coded type patch 74 specifies the anangement and orientation of the patches 16 on the particular sheet 14. This can be used for auto-queuing sheets from different jobs.
  • a conventional bar-code may be used, which would require a conventional bar-code reader in the apparatus 10.
  • patch 74 will be a color patch similar to color patches 16, where the color readings and dimensions (width & height) detected by the color sensor cartridge 20 will be translated into information by the new control circuitry 56 to specify the anangement and orientation of the patches 16 on the particular sheet.
  • Such "Page definition” instructions may also be downloaded to the new control circuitry 56 from the host computer, where a plurality of sets of instructions may conespond with a plurality of different types of bar codes that may be present on the sheets. Accordingly, the "bar code” will tell the unit 10 how the patches 16 are arranged so that automatic profiling may occur.
  • the present apparatus 10 may also be used to quickly check the calibration of a peripheral device such as a printer. This method would report to the user that a sheet being measured is within limits and tolerance is stored within the apparatus 10. Such a method would keep the user from having to recalibrate a printer more than is necessary.
  • the new control circuitry 56 may also be modified to include a rapid calibration algorithm which would be used to interpolate a complete set of measurements for tone reproduction based upon measuring all of the patches once (or occasionally being updated) and then in normal use, measure only a few key patches. After measuring the few key patches, the calculating and reporting of the rest of the patches may be performed based upon the algorithmic interpolation method.
  • the new control circuitry 56 performs data logging of measurements from the last "n" number of sheets 14. This data may be extracted by service personnel to help in trouble shooting peripheral device problems. The extracting of the data may be performed via the communication ports 60, 62 over a network.
  • the apparatus 10 is "web savvy.”
  • the new control circuitry 56 includes a TC/PIP network interface and associated controller, where the network controller provides the apparatus 10 with its own IP address.
  • the apparatus 10 may be positioned on the Internet and can be polled and controlled from remote locations.
  • the senor cartridge 20 can be removed from the apparatus 10 and placed into a hand-held device (such as that disclosed in The '583 Patent).
  • the apparatus 10 may include a connector for allowing the hand held mouse device disclosed in the The '583 Patent to be connected thereto so as to facilitate manual readings of various color patches 16.
  • the apparatus 10 can be used as a quality assurance device for printing devices for the proofing market. This will involve printing a "target" sheet 14 with the color image, measuring the target, comparing the target against a standard, and if okay, printing a label by the host computer with the test results that is then attached to the printed image sample. Because the unit is "web enabled", remote proofing applications may also be performed and results may be obtained from quality assurance sites around the world.
  • the apparatus 10 may include a "transmission" measurement capability where the paper may be fed over a multi-LED diffusion panel and the sensor cartridge may be used to sense transmission characteristics of the sample.
  • the USB interface 60 allows the apparatus 10 to be networkable and independently addressable.
  • the USB interface 60 also allows the apparatus to act as a hub for other devices (displays, data storage & keyboards).
  • the sensor cartridge 20, itself may also be a USB device that is visible and addressable by the host computer or by other devices over a network.
  • the USB sensor cartridge 20 may be "hot-swappable" between the apparatus 10 and a hand-held USB cradle.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

L'invention concerne un dispositif permettant de collecter automatiquement une pluralité de lectures de couleurs à partir d'une pluralité correspondante de touches (16) de couleur appliquées sur une feuille (14), et de transmettre cette pluralité de lectures de couleur à un ordinateur hôte. Ce dispositif comprend un détecteur (20) de couleur monté sur un chariot motorisé effectuant des allers-retours le long d'une trajectoire prédéterminée, un système (17) de chargement permettant l'introduction d'une feuille le long d'une trajectoire de chargement prédéterminée, une section exposée de cette trajectoire suivant une direction sensiblement perpendiculaire à la section de détection de la trajectoire du chariot, et la section exposée de la trajectoire d'alimentation étant sensiblement adjacente à la section de détection de la trajectoire du chariot afin de permettre au détecteur de couleur de détecter les couleurs appliquées sur la feuille introduite dans la section exposée de la trajectoire de chargement, sur toute la section de détection de la trajectoire du chariot. Ce dispositif comprend en outre une commande (56) de chariot permettant de commander la position du détecteur de couleur le long de la trajectoire du chariot, une commande (58) de chargement permettant de commander la position de la feuille le long de la trajectoire de chargement, une interface (60, 62) établissant une liaison (63) de données avec un ordinateur hôte, et un microcontrôleur (66) connecté de manière fonctionnelle avec la commande de chariot, la commande de chargement le détecteur de couleur et l'interface. Ce microcontrôleur comprend des circuits et/ou une programmation permettant d'actionner la commande de chariot et la commande de chargement de telle manière que le détecteur de couleur est exposé séparément à chacune des touches de couleur appliquées sur la feuille, et permet en outre, pour chaque exposition individuelle du détecteur de couleur à une touche de couleur, d'activer le détecteur de couleur, d'obtenir une lecture de couleur en provenance du détecteur et de transmettre les données correspondant à cette lecture de couleur par la liaison de données, via l'interface.
PCT/US2000/023747 1999-08-30 2000-08-30 Dispositif colorimetrique automatise a balayage WO2001016990A1 (fr)

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Application Number Priority Date Filing Date Title
AU74715/00A AU7471500A (en) 1999-08-30 2000-08-30 Automated scanning color measurement apparatus

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US15147199P 1999-08-30 1999-08-30
US60/151,471 1999-08-30

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7301627B2 (en) 2005-04-05 2007-11-27 X-Rite, Inc. Systems and methods for monitoring a process output with a highly abridged spectrophotometer
US7545499B2 (en) 2005-04-12 2009-06-09 X-Rite, Inc. Systems and methods for measuring a colored flexible material during a manufacturing process
US7557924B2 (en) 2005-08-15 2009-07-07 X-Rite, Inc. Apparatus and methods for facilitating calibration of an optical instrument
US7557925B2 (en) 2005-08-15 2009-07-07 X-Rite, Inc. Optical instrument and parts thereof for optimally defining light pathways

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4891690A (en) * 1984-12-04 1990-01-02 Canon Kabushiki Kaisha Color image reading apparatus with plural linear sensors which can read different lines of the image

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4891690A (en) * 1984-12-04 1990-01-02 Canon Kabushiki Kaisha Color image reading apparatus with plural linear sensors which can read different lines of the image

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7301627B2 (en) 2005-04-05 2007-11-27 X-Rite, Inc. Systems and methods for monitoring a process output with a highly abridged spectrophotometer
US7545499B2 (en) 2005-04-12 2009-06-09 X-Rite, Inc. Systems and methods for measuring a colored flexible material during a manufacturing process
US7557924B2 (en) 2005-08-15 2009-07-07 X-Rite, Inc. Apparatus and methods for facilitating calibration of an optical instrument
US7557925B2 (en) 2005-08-15 2009-07-07 X-Rite, Inc. Optical instrument and parts thereof for optimally defining light pathways

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WO2001016990A9 (fr) 2002-09-06

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