EP1834780A2 - Procédé de saisie de paramètres relatifs à la qualité d'impression d'un produit d'impression - Google Patents

Procédé de saisie de paramètres relatifs à la qualité d'impression d'un produit d'impression Download PDF

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Publication number
EP1834780A2
EP1834780A2 EP07003288A EP07003288A EP1834780A2 EP 1834780 A2 EP1834780 A2 EP 1834780A2 EP 07003288 A EP07003288 A EP 07003288A EP 07003288 A EP07003288 A EP 07003288A EP 1834780 A2 EP1834780 A2 EP 1834780A2
Authority
EP
European Patent Office
Prior art keywords
value
measuring field
halftone dot
tone
determined
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.)
Withdrawn
Application number
EP07003288A
Other languages
German (de)
English (en)
Other versions
EP1834780A3 (fr
Inventor
Christian Gugler
Shahram Dipl.-Ing. Hauck
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.)
Manroland AG
Original Assignee
Manroland AG
MAN Roland Druckmaschinen AG
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 Manroland AG, MAN Roland Druckmaschinen AG filed Critical Manroland AG
Publication of EP1834780A2 publication Critical patent/EP1834780A2/fr
Publication of EP1834780A3 publication Critical patent/EP1834780A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a method for recording pressure quality-relevant parameters on a printed product according to the preamble of claim 1.
  • Densitometers and colorimetric gauges use an integral function image of a measured measuring field to determine an actual value of a print quality-relevant parameter for this measuring field. Due to the use of the integral function image of the measured measuring field to determine the actual value of the print quality-relevant parameter, however, it remains unconsidered whether the measuring field as such is neatly printed. If the measuring field is not printed cleanly or homogeneously as a result of insufficient pressure between the forme cylinder and blanket cylinder or as a consequence of a defective or soiled blanket, then the densitometer or the colorimetric measuring device does not provide an exact actual value, such that one on such Actual value based color control can lead to poor printing results.
  • the present invention is based on the problem to provide a novel method for detecting pressure quality-relevant parameters on a printed product.
  • at least one macro-scanned image is recorded by a measuring field with the aid of a camera comprising a macro lens, whereby at least one actual value of at least one print quality-relevant parameter is determined by the image processing method or at least by one image processing method in order to check whether the measuring field prints well is.
  • a camera comprising a macro lens, in particular a high-resolution miniature camera
  • actual values of print quality-relevant parameters can be determined from the recorded macro-scanned images by an image processing method so as to check whether the measuring fields themselves are printed out clean. Allows you to check both full-tone and raster-tone areas for a clean look.
  • the result of this quality check may e.g. be used to decide whether measured values of a measuring field provided by a densitometer and / or a colorimetric measuring device can be used for color control.
  • the measuring field is a full-tone measuring field for an ink
  • a uniformity distribution or a noise of the gray-scale value over the measuring field is determined from a gray level value diagram of the complementary RGB channel as the actual value for the full-tone measuring field.
  • the measuring field is a raster-tone measuring field for a printing ink
  • a macro-image is used or a grayscale value diagram of the complementary RGB channel as the actual value for the raster-tone measuring field
  • at least one geometric parameter for raster points of the raster-tone measuring field is determined.
  • the present invention relates to a method for checking print quality-relevant parameters on a printed product, namely for checking whether a measured measuring field of the printed product is qualitatively clean or well printed.
  • measuring fields of a print control strip 20 are preferably measured, namely with the aid of a camera 21 comprising a macro lens.
  • the camera 21 is preferably a high-resolution miniature camera.
  • each of the measuring fields to be measured of the print control strip 20 receives at least one measurement image, namely a macro-metric image.
  • a macromeasure image is to be understood as a measurement image which is recorded with the aid of a camera comprising a macro lens from a small distance from the measurement field to be measured, details of a measured measurement field in the corresponding macro-metric image being magnified like a magnifying glass.
  • the magnification factor of the macro lens of the camera 21 is preferably between 20 and 50.
  • FIG. 1 shows a print control strip 20 with a total of twelve measuring fields 22, wherein some of the measuring fields 22 are designed as full-tone measuring fields 22a and others as raster-tone measuring fields 22b.
  • the camera 21 comprising the macro lens is fastened to a traverse (not shown) and can be moved in the direction of the double arrow 23 relative to the print control strip 20 in order to be able to measure each measuring field 22 thereof.
  • the camera 21 may be designed as a separate module in order to be moved independently of other modules relative to the print control strip 20 for measuring the measuring fields 22 thereof.
  • the camera 21 may also be integrated into a measuring head which contains a densitometer and / or a colorimetric measuring device, the camera then being moved together with the densitometer and / or the colorimetric measuring device relative to the printing control strip 20 for measuring the measuring fields 22 thereof.
  • At least one macro-scanned image of the measuring field 22 is recorded in a first step 24 of the method according to the invention.
  • the or each macro-metric image is evaluated with the aid of an image processing method in order to determine at least one actual value of at least one print quality-relevant parameter of the measured measuring field 22.
  • the or each determined actual value is compared with a corresponding desired value so as to determine whether the measuring field is printed in good quality or high quality or printed out.
  • an alarm message or error message can then be generated at the printing press in a subsequent step 27 if it is determined that a measuring field is not printed or printed with the required quality.
  • the camera 21 is embodied as a multi-bit camera, in particular as an 8-bit camera, which measures a measuring field 22 in the so-called RGB channels and preferably for each RGB channel a macro-measuring image of the measuring field 22 and a gray scale value diagram of the macro-measuring image or the measuring field 22 issues.
  • a total of 256 gray levels can be displayed in the gray scale value diagram.
  • FIG. 3 shows a macrograph of a measuring field executed as a full-tone measuring field 22a in a special printing ink
  • FIG. 4 showing a grayscale value diagram 28 of the macrograph of FIG. 3 and thus of the full-tone measuring field 22a, which is from the camera 20a to the printing ink the full-tone patch 22a complementary RGB channel is provided.
  • the image coordinates of the macro image of the full-tone measurement field 22a are plotted on the X coordinate and the Y coordinate of the gray scale value diagram 28, whereas the Z coordinate represents the gray scale value present in the respective pixel of the macro-measurement image of the full-tone measurement field 22a.
  • Grayscale value diagram 28 of FIG. 4 is a so-called inverted grayscale value diagram in which a greyscale value of zero corresponds to the maximum color value of the full-tone field 22a, so that deviations from this maximum color value are spikes in the grayscale value diagram 28 of the macro-image of the full-tone metering field 22a.
  • a uniformity distribution of the gray scale values over the image coordinates of the macro-meter image of the full-tone measurement field 22a and noise, respectively can be obtained of the gray scale value above the macro-mage image or the full-tone metering field 22a, and then, as shown in the embodiment of FIGS. 3 and 4, the uniformity distribution or the noise is smaller than a corresponding desired value or limit, to a qualitatively good printed full-tone measuring field 22a can be closed.
  • Fig. 6 shows a gray scale value diagram 29 of the macromessage image of a full-tone measurement field 22a shown in Fig. 5 in which significantly larger deviations of the gray-scale value over the image coordinates of the macromessage image of the full-tone measurement field 22a can be detected.
  • the uniformity distribution or the noise of the gray scale value in a plurality of pixels is greater than the corresponding desired value or limit value, in which case it is concluded that a full-tone measurement field 22a with poor quality is printed.
  • the uniformity distribution or the noise of the gray scale value on the image coordinates of the full-tone measuring field 22a or on the image coordinates of the macro-measuring image of the full-tone measuring field with respect to a desired value or limit value is therefore preferably determined on the one hand It is checked how often or on how many pixels the grayscale value exceeds the set value or limit value of the uniformity distribution or the noise.
  • the method according to the invention is also suitable for checking a raster-tone measuring field, with FIG. 7 showing a macro-scanned image of a raster-tone measuring field 22b in the region of six raster dots.
  • the grid points are executed in the embodiment shown as a round grid points. Instead of round halftone dots however, any shapes of halftone dots may be present in a halftone spot 22b.
  • the raster-tone measuring field 22b records at least one macro-scanned image with the aid of a camera comprising a macro lens, whereby an actual value of at least one print quality-relevant parameter is determined from the or each macro-scanned image by an image processing method.
  • the or each actual value is a geometrical characteristic of the raster points of the raster-tone measuring field 22b, wherein if the or each geometric characteristic is smaller than a corresponding desired value or limit value, then it is printed on a good quality Rastererton measuring field is closed, and wherein, if the or each geometric characteristic is greater than a corresponding setpoint or limit, is closed to a poor quality printed raster-tone measuring field 22b.
  • the most frequent grayscale value steps are determined with the aid of an image processing method to determine a geometrical characteristic for round halftone dots of a halftone measuring field 22b with the aid of a grayscale value diagram 30, in which case all image information, the outside the most common gray scale levels are filtered out.
  • the maximum dot diameter D MAX and the minimum dot dot diameter D MIN of the halftone dots are approximately equal and accordingly the halftone dot deformation value RPDW 1 of the halftone dots is relatively small, can be closed on round and well-printed halftone dots of the scanning tone measuring field 22b.
  • the first dot deformation value RPDW 1 of the halftone dots is relatively large , can be closed on poorly printed grid points or on a doubling of the grid points. The smaller the difference between the minimum and maximum grid dot diameters, the better the halftone dots are printed.
  • the grayscale value diagram 30 of FIG. 8 of a well-printed raster-tone measurement field 22b is characterized by round and sharp transitions between adjacent raster points, whereas the gray level value diagram 31 of a poorly printed raster-tone measurement field 22b shows fuzzy and out-of-round transitions.
  • a second halftone dot deformation value can be determined for each round halftone dot of a halftone dot field in addition to the first halftone dot deformation value already shown above, namely a minimum halftone dot area of a halftone dot which is determined for a first defined gray scale value range, and a maximum halftone dot area of the halftone dot that is determined for a second gray scale value range defined.
  • the gray scale value range is increased, and within this gray scale value range, the maximum halftone dot area of the halftone dots is then determined.
  • the method according to the invention for checking whether the measuring fields of a printed product are printed with good quality can preferably be combined with a color control method such that actual values used on the measuring fields with the aid of a densitometer and / or a colorimetric measuring device are only used for the regulation if According to the method of the invention, it has been determined in advance that the measuring field is qualitatively well printed.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Image Processing (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP07003288A 2006-03-06 2007-02-16 Procédé de saisie de paramètres relatifs à la qualité d'impression d'un produit d'impression Withdrawn EP1834780A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610010180 DE102006010180A1 (de) 2006-03-06 2006-03-06 Verfahren zur Erfassung druckqualitätsrelevanter Parameter an einem Druckprodukt

Publications (2)

Publication Number Publication Date
EP1834780A2 true EP1834780A2 (fr) 2007-09-19
EP1834780A3 EP1834780A3 (fr) 2011-04-27

Family

ID=38171197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07003288A Withdrawn EP1834780A3 (fr) 2006-03-06 2007-02-16 Procédé de saisie de paramètres relatifs à la qualité d'impression d'un produit d'impression

Country Status (2)

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EP (1) EP1834780A3 (fr)
DE (1) DE102006010180A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995000337A1 (fr) * 1993-06-17 1995-01-05 The Analytic Sciences Corporation Systeme automatise de controle de la qualite d'impression
DE10303282A1 (de) * 2002-02-01 2003-08-14 Hueck Folien Gmbh Qualitätskontrollsystem und Authentizitätsnachweissystem für bedruckte und/oder geprägte bahnförmige Materialien
EP1579994A1 (fr) * 2004-03-23 2005-09-28 Koenig & Bauer Aktiengesellschaft Machine d'impression avec un système d'inspection en ligne

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD274786A1 (de) * 1988-08-11 1990-01-03 Adw Ddr Kybernetik Inf Verfahren und anordnung zur ueberwachung der druckqualitaet mehrfarbiger rasterdruckvorlagen einer offset-druckmaschine
DE4102122C2 (de) * 1990-12-08 1994-02-17 Schoeller Felix Jun Papier Verfahren zur visuellen Kontrolle der Formation von einer in einer Richtung bewegten Bahn aus fotografischem Basispapier oder Basiskarton
DE10016566A1 (de) * 2000-04-03 2001-10-11 Innomess Elektronik Gmbh Verfahren zur Messung von Farbwerten an gedruckten Farbmarken
US6493083B2 (en) * 2000-12-15 2002-12-10 Xerox Corporation Method for measuring color registration and determining registration error in marking platform
DE10261221A1 (de) * 2002-12-20 2004-07-15 Océ Document Technologies GmbH Verfahren und Vorrichtung zur Echtzeitkontrolle von Druckbildern

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995000337A1 (fr) * 1993-06-17 1995-01-05 The Analytic Sciences Corporation Systeme automatise de controle de la qualite d'impression
DE10303282A1 (de) * 2002-02-01 2003-08-14 Hueck Folien Gmbh Qualitätskontrollsystem und Authentizitätsnachweissystem für bedruckte und/oder geprägte bahnförmige Materialien
EP1579994A1 (fr) * 2004-03-23 2005-09-28 Koenig & Bauer Aktiengesellschaft Machine d'impression avec un système d'inspection en ligne

Also Published As

Publication number Publication date
DE102006010180A1 (de) 2007-09-13
EP1834780A3 (fr) 2011-04-27

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