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EP0658428B1 - Système de commande d'imprimerie - Google Patents

Système de commande d'imprimerie Download PDF

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Publication number
EP0658428B1
EP0658428B1 EP93310110A EP93310110A EP0658428B1 EP 0658428 B1 EP0658428 B1 EP 0658428B1 EP 93310110 A EP93310110 A EP 93310110A EP 93310110 A EP93310110 A EP 93310110A EP 0658428 B1 EP0658428 B1 EP 0658428B1
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EP
European Patent Office
Prior art keywords
ink
production
copy
rgbi
data set
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.)
Expired - Lifetime
Application number
EP93310110A
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German (de)
English (en)
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EP0658428A1 (fr
Inventor
Xinxin Wang
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.)
Goss International LLC
Original Assignee
Goss Graphic Systems Inc
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.)
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Publication date
Application filed by Goss Graphic Systems Inc filed Critical Goss Graphic Systems Inc
Priority to EP93310110A priority Critical patent/EP0658428B1/fr
Priority to DE69326010T priority patent/DE69326010T2/de
Priority to AT93310110T priority patent/ATE183137T1/de
Publication of EP0658428A1 publication Critical patent/EP0658428A1/fr
Application granted granted Critical
Publication of EP0658428B1 publication Critical patent/EP0658428B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply

Definitions

  • the present invention relates to control systems for a printing press.
  • press room color reproduction quality control system cart be divided into the following two categories: one is a "control by target” system, and the other is a “control by image” system.
  • control by target In the "control by target” system, a set of color control targets is printed in a margin. Instruments, such as densitometers, are used to monitor the color attributes, such as the optical density, of these targets. The printing press is then adjusted based on the deviation of these control targets from a predefined attribute value.
  • the application of this "control by target” system is restricted in that an additional process is required to cut off this target from the final product. This system also requires a tight material control for paper, ink, and other printing parameters.
  • control by image In the "control by image” system, the print image on a live copy is compared with the printed image on a reference copy, called a proof. The press is then adjusted based on the difference between the live image and the reference image.
  • This system is more versatile because it does not require an additional target.
  • This system is also more accurate than the "control by target” system, because in some situations although the measured attributes of control targets on the live and reference images are the same, those two images still look different.
  • both the image comparing task and the press adjusting task are done by a press operator.
  • opto-electronic sensor devices such as a spectrophotometer, or CCD color cameras, to measure the color reproduction quality.
  • the bandwidth of these sensor devices is limited to the visible region of 400 nm through 700 nm in wavelength of the electro-magnetic spectrum.
  • these devices such as the spectrophotometer might be able to measure the printed colour accurately, it is difficult to use the measured colour information to achieve the automatic control for a four-colour press without a target due to the involvement of the UCR and GCR techniques.
  • CH-A-649842 discloses a device for determination of colour components in multicolour print.
  • the device includes a filter wheel having three filters for components in the visible light spectrum and an infrared filter to be used with a photodetector of appropriately wide range photodection from visible to infra red. The results are evaluated with the aid of a colour table. It is not disclosed that any other factors are taken into account in the evaluation.
  • a principal feature of the present invention is the provision of an improved control system for a four-colour printing press.
  • control system for a (four-colour) printing press, said printing press using cyan, magenta, yellow and black inks to produce a colour image on a paper surface, the control system comprising:
  • a feature of the present invention is the provision of a sensor structure or device for detecting the energy reflected from the paper surface, with the sensor structure having a minimum of four separate channels, and with at least one channel operable in the infrared region of the electromagnetic spectrum.
  • the bandwidth of the infrared channel may be between 800nm and 1100nm, which is a portion of the near infrared region and which is compatible with a regular silicon detector.
  • the working wavelength of the infrared channel may be longer than 1100nm or within the 700-800nm transition region.
  • a further feature of the invention is that at least three distinct channels are utilized in the visible region. Three of these channels may correspond to red, green and blue (RGB), or cyan, magenta, and yellow (CMY), or other colors.
  • the bandwidth of each channel may be less than 70 nm, more than 100 nm, or any value in between, with channels having a multiple peak in its passing band, such as magenta, being also included.
  • the sensor device can be constructed from either a single element detector, a one-dimensional (linear) detector, a two-dimensional (area) detector, or other suitable detector structure.
  • the sensor can be constructed by adding an additional infrared channel to existing devices, e.g., adding an infrared channel to a RGB color camera or a densitometer, or by extending the working band into the infrared region e.g., adding infrared capability to a spectrophotometer.
  • the light source used provides enough radiated energy in both the visible region and the infrared region, depending upon the sensor working band and sensitivity.
  • all possible values which are output from the sensor device may be used to form a vector space.
  • all possible values output from a sensor device with Red, Green, Blue, and Infrared channels form a four dimensional vector space R-G-B-IR, being termed a sensor space, with each output from the sensor device being termed a vector in the sensor space.
  • Another feature of the invention is that the minimum number of dimensions required by this sensor structure is four.
  • a set of variables can be defined to represent the amount of ink presented in a given area.
  • a set of variables C, M, Y, and K black
  • This set of variables may correspond to the ink volume, average ink film thickness, dot size, or other quantities related to the amount of ink in a given area on the paper surface, with the vector space by this set of variables being termed an ink space, with the ink space having formed a dimension of four for a four-color printing press.
  • Another feature of the invention is that there exists at least one transfer function which can map a vector in the four dimensional ink space into a vector in the four dimensional sensor space, with the transfer function being termed a forward transfer function.
  • the forward transfer function can be used in a soft proof system, which can electronically generate a proof image.
  • This electronically generated proof image can be stored in the system as a reference, or can be displayed on a CRT screen for visual inspection.
  • a further feature of the invention is that there exists at least one transfer function which can map a vector in the four dimensional sensor space into a vector in the four dimensional ink space, with the transfer function being termed a reverse transfer function.
  • the printed image on a live copy can be compared with the printed image on a reference copy in the sensor space. If the difference between the live copy and the reference copy is within a predefined tolerance level, at least for all channels in the visible region of the sensor space, the live copy is said to be acceptable by definition.
  • both the live image and the reference image in the sensor space can be mapped into the ink space by applying the reverse transfer function point by point.
  • the difference between the live image and the reference image in the ink space thus represents the difference of the ink distribution for each of the cyan, magenta, yellow, and black inks.
  • Another feature of the invention is that the difference between the live and the reference images in the ink space indicates which printing unit should be adjusted, which direction (up or down) it should be adjusted, and the amount of ink which should be adjusted.
  • a press control Formula can be developed to adjust press parameters, such as ink input rate in lithographic or letterpresses, ink consistency in flexographic or gravure presses, water input rate in lithographic presses, or temperature in any of the above, based on the differences between the live and the reference image in the ink space.
  • the press adjustment can be achieved by an automatic control system by the press operator alone, or by the interaction between the automatic control system and the press operator.
  • the sensor device may be used to monitor the printing web of the press directly, i.e., on press sensing, or to monitor the prints collected from the folder of the press, i.e., off press sensing.
  • the image of the reference copy in the sensor space can be generated electronically by the forward transfer function.
  • the electronically generated reference may be used to set up the press in order to reduce the makeready time.
  • Yet another feature of the invention is that the colour reproduction quality can be maintained through the entire press run, through different press runs on different presses, or at different times.
  • a closed loop automatic colour reproduction control system may be formed with or without an additional colour control target.
  • a further feature of the invention is that the variation of ink, paper, and other press parameters can be compensated, such that the printed copies have the highest possible overall results in matching the reference copy.
  • a method for controlling the operation of a printing press the printing press using cyan, magenta, yellow and black inks to produce a colour image on a paper surface, the method comprising the steps of:
  • FIG. 1 there is shown a control system generally designated 10 for a printing press 11 of the present invention.
  • the control system 10 has a 4 channel sensor 21, a data converter 23 for processing information from the sensor 21, and a device 25 for controlling ink for the press 11.
  • the 4 channel sensor 21 detects the energy reflected from a paper surface, such as the paper web for the press 11, in both the visible region and the infrared region of the electromagnetic spectrum.
  • electromagnetic waves in the infrared region have a longer wave length than the visible spectrum, with the wave lengths of the electromagnetic waves in the region of visible light being approximately 400 to 700 nanometers (nm), and the wave lengths of the electromagnetic waves in the infrared region, including near infrared, being equal to or greater than 800 nm.
  • the control system 10 has a support 12 for placement of a sheet of paper 14 with image or indicia 16 on the sheet 14 in a configuration beneath a pair of opposed lights 18 and 20 for illuminating the sheet 14.
  • the system 10 has a first color video camera or sensor 22 having three channels for detecting attributes of the inks from the sheet 14 in the visible region of the electromagnetic spectrum, such as red, green, and blue, or cyan, magenta, and yellow, and for sending the sensed information over separate lines or leads 24, 26, and 28 to a suitable digital computer 30 or Central Processing Unit having a randomly addressable memory (RAM) and a read only memory (ROM), with the computer or CPU 30 having a suitable display 32.
  • RAM randomly addressable memory
  • ROM read only memory
  • the system 10 also has a black/white second video camera or sensor 34 having a filter 50 such that it senses the attributes of the inks in the infrared region of the electromagnetic spectrum, having a wave length greater than the wave length of the electromagnetic waves in the visible region of light.
  • the camera or sensor 34 thus senses infrared information from the sheet 14, and transmits the sensed information over a lead 36 to the computer 30, such that the information concerning the infrared rays is stored in and processed by the computer 30.
  • the normalized percentage of infrared (IR) reflection vs. the percentage of dot area is shown in the chart of FIG. 7. It will be seen that the infrared reflectance of cyan, magenta, and yellow inks show no significant change as a function of percentage of dot area. However, the normalized infrared reflectance of the black ink displays a significant change as a function of percentage of dot area, and changes from a normalized value of 100% IR reflection for 0% dot area to approximately 18% IR reflection corresponding to 100% dot area. Hence, the black ink may be easily sensed and distinguished from other color inks in the infrared region of the electromagnetic waves.
  • the sheet 14 may contain printed image or indicia 16 which is obtained from a current press run of the press 11, termed a live or current copy.
  • a sheet 38 containing printed image or indicia 40 termed a reference copy, from a previous reference press run may be placed on the support 12 beneath the cameras 22 and 34 in order to sense the energy reflected from the sheet 38, and send the sensed information to the memory of the computer 30 for storage and processing in the computer 30, as will be described below.
  • the cameras or sensors 22 and 34 may be used to sense both the current copy or sheet 14 and the reference copy or sheet 38.
  • the information supplied by the cameras 22 and 34 is formed into digital information by a suitable analog to digital converter in a frame grabber board on the computer 30.
  • the computer 30 operates on the digital information which is stored in its memory corresponding to the information sensed from the sheets 14 and 38 by the cameras or sensors 22 and 34.
  • FIG. 3 there is shown a block diagram of the control system 10 for the printing press 11 of the present invention.
  • the four inks (cyan, magenta, yellow and black) of the four-color printing press 11 are first preset, after which a print is made by the press 11 with a current ink setting, thus producing a live or current printed copy, as shown.
  • the color and black/white video cameras or sensors 22 and 34 of FIG. 2 serve as a four channel sensor 21 to capture an image of the current printed copy, and then place this information into the memory of the computer 30 after it has been formed into digital information.
  • an "Ink Separation Process” 23 is used to convert the red, green, blue and IR images captured by the four channel sensor 21 into four separated cyan, magenta, yellow and black ink images, which represent the amount of corresponding ink presented on the live copy.
  • the "Ink Separation Process” 23 may utilize mathematic formulas, data look up tables or other suitable means to perform the data conversion task.
  • the similar processes are also applied to the reference copy.
  • the four channel sensor 21 is used to capture the red, green, blue and IR images from the reference copy.
  • the "Ink Separation Process" 23 is utilized to obtain the cyan, magenta, yellow and black ink images, which represent the amount of corresponding ink presented on the reference copy.
  • the ink images of the live copy are compared with the ink images of the reference copy by the computer 30 to detect the variation of ink distribution for each of the cyan, magenta, yellow and black inks.
  • the determined differences in ink distribution are then processed by the computer 30 in order to obtain an indication for controlling the keys or other devices of the press 11 in an ink control process, and thus provide an indication of an ink adjustment to the press to obtain further copies which will have a closer match to the reference copy.
  • the indication of ink changes may be automatically supplied to the press 11, or the operator may utilize the indications of ink color attributes to set the press 11, such as adjustments to ink input rate by using the the keys.
  • the four channel sensor 21 is utilized to sense not only attributes in three channels of the visible region, the fourth channel of the sensor 21 senses an attribute in the infrared region in order to determine the correct amount of inks, including black ink, to correctly reproduce the proof.
  • the printing press control system 10 uses the four channel detector or sensor 21 to detect the energy reflected from a paper surface, such as the sheets 14 and 38, or the paper web of the press 11, with three channels being in the visible region and one channel being in the infrared region of the electromagnetic spectrum.
  • the control system 10 has a device 23 for converting the output of the sensing device 21 to a set of variables which represent the amount of ink presented on the paper for any of the cyan, magenta, yellow, and black inks, and a device 25 responsive to the converting device 23 for adjusting the four-color printing press 11 to maintain the color consistency.
  • the bandwidth of the infrared channel may be between 800 nm and 1100 nm, which is a portion of the near infrared region, and which is compatible with a regular silicon detector, although the working wavelength of the 15 infrared channel may be longer than 1100 nm.
  • At least three distinct channels are utilized in the visible region which may correspond to red, green, and blue (RGB), or cyan, magenta, and yellow (CMY), or other colors.
  • the bandwidth of each channel in the visible region may be less than 70 nm, more than 100 nm, or any value in between, with channels having a multiple peak in its passing band, such as magenta, being also included.
  • the sensor device 21 may be constructed from either a single element detector, a one-dimensional (linear) detector, a two-dimensional (area) detector, or other suitable detector structure, as will be seen below.
  • the sensor device may be constructed by adding an additional infrared channel to existing devices, adding an infrared channel to a RGB color camera or a densitometer, or by extending the working band into the infrared region, e.g., adding infrared capability to a spectrophotometer.
  • the light source 18 and 20 used provides sufficient radiated energy in both the visible region and the infrared region, depending upon the sensor working band and sensitivity.
  • All possible values which are output from the sensor device 21 may be used to form a vector space.
  • all possible values output from the sensor device 21 with red, green, blue and infrared channels form a four dimensional vector space R-G-B-IR, with the vector space being termed a sensor space S 1 , with each output from the sensor device 21 being termed a vector in the sensor space S 1 , with the minimum number of dimensions required by the sensor structure being 4.
  • a set S 1 of elements e i1 and e i2 being given, with the elements e i1 of the set S 1 being the vectors v i1 corresponding to the output from the sensor device 21 of sensing a live or current printed copy, and with the elements e i2 of the set S 1 being the vectors v i2 corresponding to the output from the sensor device 21 sensing a reference printed copy.
  • the printed image on a live or current copy may be compared with the printed image on a reference copy in the sensor space, and if the difference between the live copy L.C. s and the reference copy R.C.
  • s is within a predefined tolerance level delta, at least for all the channels in the visible region of the sensor space, such that,
  • a set of variables may be defined to represent the amount of ink presented in a given area.
  • a set of variables, C, M, Y, and K can be defined to represent or be a function of the amount of cyan, magenta, yellow, and black ink in a given area.
  • This set of variables may correspond to the ink volume, average ink film thickness, dot size, or other quantities related to the amount of ink in a given area on the paper surface.
  • the vector space formed by this set of variables is termed an ink space S 2 , with the ink space S 2 having a dimension of 4 for a four color printing press 11.
  • a set S 2 of elements d i1 and d i2 are given, with the elements d i1 of the set S 2 being the vectors v j1 corresponding to the variables associated with the live or current copy in the ink space S 2 , and with the elements d i2 of the set S 2 being the vectors v j2 corresponding to the variables associated with the reference copy in the ink space S 2 .
  • FIG. 9 there exists at least one transfer function or transformation phi which can map the elements d i1 and d i2 of the set S 2 , or the four dimensional ink space, into the elements e i1 and e i2 of the set S 1 or the four dimensional sensor space, with the transformation phi being termed a forward transfer function, as shown in FIGS. 9 and 10. It is noted that the subsets in each set S 1 and S 2 may overlap or may be the same.
  • the forward transfer function may be used in a soft proof system which can generate a proof image which can be stored in the system as a reference or can be displayed on a CRT screen.
  • both the live image and the reference image in the sensor space or set S 1 can be mapped into the ink space or set S 2 by applying the reverse transfer function phi -1 point by point as shown in FIGS. 9 and 10.
  • the difference between the live image and the reference image in the ink space S 2 thus represents the difference of the ink distribution for each of the cyan, magenta, yellow, and black inks, as shown in FIG. 11.
  • the difference between the live and reference images in the ink space S 2 indicates which printing unit should be adjusted, which direction, up or down, it should be adjusted, and the amount of ink which should be adjusted.
  • a suitable press control formula may be developed to adjust press parameters, such as ink input rate in lithographic or letterpresses, ink consistency in flexographic or gravure presses, water input rate in lithographic presses, or temperature in any of the above, based on the differences between the live and the reference image in the ink space S 2 .
  • the press adjustments can be achieved by the automatic control system 10 or by the interaction between the automatic control system 10 and the press operator.
  • the sensor device 21 may be used to monitor the printing web of the press 11 directly, i.e., on press sensing, or to monitor the prints collected from the folder of the press, i.e., off press sensing. If the digital images from the color separation processing, or the film/plate images are available, the image of the reference copy in the sensor device 21 can be generated electronically by the forward transfer function phi. The electronically generated reference may be used to set up the press 11 in order to reduce the makeready time.
  • the color reproduction quality can be maintained through the entire press run, through different press runs on different presses, or at different times.
  • a closed loop automatic color reproduction control system may be formed without an additional color control target.
  • the variation of ink, paper, and other press parameters can be compensated such that the printed copies have the highest possible overall results in matching the reference copy.
  • the camera or sensor 22 may be associated with a rotating filter member 52 having filters which only transmit the desired colors F 1 , F 2 , and F 3 , such as red, green, and blue during rotation, such that the camera or sensor 22 senses and records the colors F 1 , F 2 , and F 3 sequentially or separately from the printed material which may be taken either from the current press run or from the reference press run.
  • the filter member 52 may have an infrared (IR) filter F 4 in order to sense and record the energy reflected from the printed material in the infrared region.
  • IR infrared
  • the camera or sensor 22 may comprise a charge coupled device (CCD) with built in filters which converts light energy reflected from the printed material into electric energy in a video camera, i.e. F 1 , F 2 , F 3 , and F 4 (IR), such as the distinct colors red, green, and blue in the visible region, and the near infrared energy in the infrared region, in order to supply the information to the computer 30 for storage and processing, as previously discussed.
  • CCD charge coupled device
  • IR near infrared energy in the infrared region
  • FIG. 6 Another embodiment of the camera or sensor 22 of the present invention is illustrated in FIG. 6, in which like reference numerals designate like parts.
  • the camera or sensor 22 has a beam splitter in order to separate the incoming light reflected from the printed material into an infrared beam for a first CCD 1, F 1 such as red for a second CCD 2, F 2 such as green for a third CCD 3, and F 3 such as blue for a fourth CCD.
  • suitable prisms, lenses, or mirrors may be utilized to accomplish the beam splitting of light in order to obtain the desired color attributes in the various charge coupled devices to supply the information to the computer 30 for storage and processing in the computer 30, in a manner as previously described.
  • any other suitable camera or sensing device may be utilized to obtain the desired colors.
  • a control system 10 for a printing press 11 which ascertains three distinct attributes, such as colors, in the visible region of electromagnetic waves and an attribute in the infrared region of the electromagnetic spectrum for the printed inks.
  • the control system 10 utilizes these four attributes in a four channel device to indicate and control the ink colors for use in the press 11.
  • the colors may be sensed from a sheet taken during a current press run, and from a sheet taken during a reference press run, after which the sensed information is utilized in order to modify ink settings of a press 11 in order to obtain repeatability of the same colors from the reference run to the current press run.
  • a consistent quality of colors may be maintained by the printing press 11 irrespective of the number of runs after the reference run has been made, and may be continuously used during a press run if desired.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Control Of Eletrric Generators (AREA)
  • Selective Calling Equipment (AREA)

Claims (16)

  1. Système de commande pour presse d'imprimerie, ladite presse utilisant des encres cyan, magenta, jaune et noire pour produire une image couleur sur une surface de papier, ledit système comprenant :
    des moyens de détection de l'énergie réfléchie d'une surface papier à la fois dans une zone visible et une zone infrarouge du spectre électromagnétigue, lesdits moyens de détection présentant une sortie ;
    des moyens de conversion de la sortie des moyens de détection en un ensemble de données représentant un volume d'encre, une épaisseur moyenne de pellicule d'encre ou une taille de point d'encre pour les encres cyan, magenta, jaune et noire présentes sur le papier dans une zone donnée ; et
    des moyens de comparaison d'un premier ensemble de données et d'un deuxième ensemble de données engendrées par les moyens de conversion, et de réglage de la presse d'imprimerie quadrichromie pour conserver la cohésion des couleurs en réaction à une différence entre le premier et le deuxième ensembles de données, le premier ensemble de données représentant le volume d'encre, l'épaisseur moyenne de pellicule d'encre ou la taille de point d'encre pour les encres cyan, magenta, jaune et noire présentes sur une zone donnée sur une copie de référence et le deuxième ensemble de données représentant le volume d'encre, l'épaisseur moyenne de pellicule d'encre ou la taille de point d'encre pour les encres cyan, magenta, jaune et noire présentes sur une zone d'un exemplaire de production correspondant à la zone donnée sur l'exemplaire de référence.
  2. Système conforme à la revendication 1 où les moyens de détection détectent au moins quatre canaux séparés, au moins trois desdits canaux étant exploitables sur la zone visible du spectre électromagnétique et au moins un desdits canaux étant exploitable sur la zone infrarouge du spectre électromagnétique.
  3. Système conforme à la revendication 2 où la largeur de bande du canal infrarouge est comprise entre 800 nm et 1100 nm.
  4. Système conforme à la revendication 2 où la longueur d'onde de travail du canal infrarouge est supérieure à 1100 nm ou comprise sur la zone de transition de 700-800 nm.
  5. Système conforme à la revendication 1 où l'énergie réfléchie sur la zone visible comprend les attributs des couleurs rouge, verte et bleue.
  6. Système conforme à la revendication 1 où l'énergie réfléchie sur la zone visible comprend les attributs des couleurs cyan, magenta et jaune.
  7. Système conforme à la revendication 2 où la sortie des moyens de détection comprend plusieurs éléments comportant des vecteurs dans un espace de détection.
  8. Système conforme à la revendication 7 où les éléments de l'espace de détection comprennent des vecteurs désignant une image tirée de l'exemplaire de référence et de l'exemplaire de production.
  9. Système conforme à la revendication 1 où les moyens de comparaison comparent une troisième ensemble de données, correspondant à une image tirée de l'exemplaire de référence, à un quatrième ensemble de données, correspondant à une image tirée de l'exemplaire de production, le troisième ensemble de données et le quatrième ensemble de données comprenant la sortie des moyens de détection.
  10. Système conforme à la revendication 9 où les moyens de comparaison acceptent l'exemplaire de production si la différence entre le troisième et le quatrième ensembles de données reste dans des limites prédéterminées.
  11. Système conforme à la revendication 7 où les vecteurs dans l'espace de détection sont au moins en quatre dimensions.
  12. Système conforme à la revendication 1 où le premier et le deuxième ensembles de données comprennent plusieurs vecteurs en quatre dimensions.
  13. Système conforme à la revendication 9 où les moyens de conversion convertissent le troisième ensemble de données en premier ensemble de données et le quatrième ensemble de données en deuxième ensemble de données.
  14. Système conforme à la revendication 1 dans lequel le papier comprend une bobine de la presse.
  15. Méthode de contrôle d'exploitation d'une presse d'imprimerie, ladite presse d'imprimerie utilisant des encres cyan, magenta, jaune et noire pour produire une image couleur sur une surface de papier, la méthode comprenant les phases suivantes :
    réalisation d'un exemplaire de référence d'une image à imprimer ;
    mesure des valeurs de réflexion rouge, verte, bleue et infrarouge (RVBI) de référence à partir de l'exemplaire de référence ;
    conversion des valeurs de référence RVBI en valeurs d'encre cyan, magenta, jaune et noire (CMJN) représentant la quantité d'encre présente sur l'exemplaire de référence ;
    réalisation d'un exemplaire de production de l'image imprimée par la presse d'imprimerie ;
    mesure des valeurs de réflexion RVBI de production à partir de l'exemplaire de production ;
    comparaison des valeurs de réflexion RVBI de production avec les valeurs de réflexion RVBI de référence ;
    si la comparaison fait apparaítre une différence entre les valeurs de réflexion RVBI de production et les valeurs de réflexion RVBI de référence supérieure à un seuil prédéterminé, conversion des valeurs de réflexion RVBI de production en valeurs d'encre CMJN de production représentant la quantité d'encre sur l'exemplaire de production, mise au point d'une différence entre les valeurs d'encre CMJN de production et les valeurs d'encre CMJN de référence aux endroits correspondant, et réglage de la presse d'imprimerie pour corriger la différence entre les valeurs de réflexion RVBI de production et de référence en fonction de la différence entre les valeurs d'encre CMJN de production et de référence ; et
    si la différence entre les valeurs de réflexion RVBI de production et les valeurs de réflexion RVBI de référence est inférieure à un seuil prédéterminé, acceptation de l'exemplaire de production sans conversion des valeurs de réflexion RVBI de production en valeurs d'encre CMJN de production et sans réglage de la presse d'imprimerie.
  16. Méthode définie selon la revendication 15 où les valeurs d'encre CMJN de référence et de production représentent le volume d'encre, l'épaisseur moyenne d'encre ou la taille de point d'encre.
EP93310110A 1993-12-15 1993-12-15 Système de commande d'imprimerie Expired - Lifetime EP0658428B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP93310110A EP0658428B1 (fr) 1993-12-15 1993-12-15 Système de commande d'imprimerie
DE69326010T DE69326010T2 (de) 1993-12-15 1993-12-15 Druckereisteuerungssystem
AT93310110T ATE183137T1 (de) 1993-12-15 1993-12-15 Druckereisteuerungssystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93310110A EP0658428B1 (fr) 1993-12-15 1993-12-15 Système de commande d'imprimerie

Publications (2)

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EP0658428A1 EP0658428A1 (fr) 1995-06-21
EP0658428B1 true EP0658428B1 (fr) 1999-08-11

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US5903712A (en) * 1995-10-05 1999-05-11 Goss Graphic Systems, Inc. Ink separation device for printing press ink feed control
EP0795400A1 (fr) * 1996-03-12 1997-09-17 Goss Graphic Systems, Inc. Dispositif pour aligner automatiquement une image d'une copie de production avec une image d'une copie de référence dans un système de contrÔle d'une machine d'impression
US6024018A (en) * 1997-04-03 2000-02-15 Intex Israel Technologies Corp., Ltd On press color control system
DE19802920B4 (de) 1998-01-27 2008-01-31 Man Roland Druckmaschinen Ag Verfahren und Vorrichtung zur Farbregelung in Druckmaschinen
US6252220B1 (en) 1999-04-26 2001-06-26 Xerox Corporation Sensor cover glass with infrared filter
US6768565B1 (en) 2000-09-07 2004-07-27 Xerox Corporation Infrared correction in color scanners
US6316284B1 (en) 2000-09-07 2001-11-13 Xerox Corporation Infrared correction in color scanners
JP3848877B2 (ja) 2001-12-27 2006-11-22 三菱重工業株式会社 印刷機における色調制御方法とその装置
JP4365754B2 (ja) * 2004-08-31 2009-11-18 三菱重工業株式会社 絵柄色調制御方法及び装置
DE102008049908A1 (de) * 2008-10-02 2010-04-08 Robert Bosch Gmbh Verfahren zur Erzeugung eines Detektionssignals und Erfassungseinrichtung
DE102012106981A1 (de) * 2012-07-31 2014-02-06 Eltromat Gmbh Verfahren zur Prüfung des Druckergebnisses bei Rotationsdruckmaschinen

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IT1135365B (it) * 1980-02-27 1986-08-20 Roland Man Druckmasch Procedimento per determinare singoli componenti cromatici in una stampa in plicromia per mezzo d'un densitometro
DD227094B5 (de) * 1984-10-04 1996-02-22 Roland Man Druckmasch Verfahren zur farbmetrischen Auswertung von Druckprodukten
DE59003421D1 (de) * 1989-07-14 1993-12-16 Gretag Ag Verfahren zur Bestimmung der Farbmasszahldifferenzen zwischen zwei mit hilfe einer Druckmaschine gedruckten Rasterfeldern sowie Verfahren zur Farbsteuerung oder Farbregelung des Druckes einer Druckmaschine.
DE4023320A1 (de) * 1990-07-21 1992-01-23 Polygraph Contacta Gmbh Verfahren zur erfassung und steuerung der qualitaet von druckerzeugnissen
US5224421A (en) * 1992-04-28 1993-07-06 Heidelberg Harris, Inc. Method for color adjustment and control in a printing press

Also Published As

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DE69326010T2 (de) 1999-11-25
ATE183137T1 (de) 1999-08-15
DE69326010D1 (de) 1999-09-16
EP0658428A1 (fr) 1995-06-21

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