EP1958774A2 - Procédé destiné à la régulation de processus d'impression - Google Patents

Procédé destiné à la régulation de processus d'impression Download PDF

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Publication number
EP1958774A2
EP1958774A2 EP08002539A EP08002539A EP1958774A2 EP 1958774 A2 EP1958774 A2 EP 1958774A2 EP 08002539 A EP08002539 A EP 08002539A EP 08002539 A EP08002539 A EP 08002539A EP 1958774 A2 EP1958774 A2 EP 1958774A2
Authority
EP
European Patent Office
Prior art keywords
actual value
setpoint
measuring
dimensional
value
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Withdrawn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
EP08002539A
Other languages
German (de)
English (en)
Other versions
EP1958774A3 (fr
Inventor
Alfons Schuster
Michael Schönert
Christian Echerer
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
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 filed Critical Manroland AG
Publication of EP1958774A2 publication Critical patent/EP1958774A2/fr
Publication of EP1958774A3 publication Critical patent/EP1958774A3/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Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks

Definitions

  • the invention relates to a method for the regulation of printing processes according to the preamble of claim 1.
  • the DE 42 37 004 C2 discloses a non-marking control method for controlling the color density of a printed product, wherein for this purpose the printed image of the printed product is measured directly by means of sensors. Actual values determined here are compared with reference values which are based on image data or prepress data.
  • the DE 101 49 158 A1 discloses a likewise without a brand-working method for cutting register control on a printing machine, wherein also in this method for the control pressure pre-stage-based setpoints are used.
  • the printing material is moved past a sensor fixed in the running direction or transport direction of the printing material to measure a printed image printed on the substrate, wherein the sensor detects a measuring location within the printed image by measuring to measure the printed image.
  • the printing material is moved past a fixed sensor, wherein the sensor detects a measuring location on the printing material for measuring the print control marks.
  • Either a one-dimensional sensor or a two-dimensional sensor can be used as a sensor for measuring a measuring location on the printed substrate, wherein a one-dimensional sensor provides a one-dimensional measuring vector as the measured value, whereas a two-dimensional sensor provides a two-dimensional measuring matrix as the measured value.
  • a measurement accuracy between 10 microns and 50 microns can be easily achieved, but such a high resolution on the one hand results in a relatively small site and on the other hand requires very short exposure times of less than 1 microseconds. If such short exposure times are to be realized, then robust LED flashes can not be used, but then relatively expensive lamp flashes must be used, which exhaust relatively quickly and therefore must be maintained very frequently.
  • the measurement of the measuring location with such a high resolution requires large calculation times.
  • the present invention has the object to provide a novel method for the regulation of printing processes.
  • the or each system deviation is determined in such a way that the actual value and the desired value are first offset at reduced resolution in a correlation method, and then an interpolation is performed in the region of the maximum of the correlation to the subpixel approximation.
  • the respective actual value is first calculated with reduced resolution in a correlation method, then an interpolation for sub-pixel approximation is performed in the region of the maximum of the correlation.
  • an interpolation for sub-pixel approximation is performed in the region of the maximum of the correlation.
  • each value of a correlation vector resulting in the correlation method or of a resulting correlation matrix represents a very precise floating-point number
  • the position of the maximum of the correlation and thus the highly accurate control deviation can nevertheless be determined in a very high resolution by means of the downstream subpixel approximation. In this case, even over the prior art, the resolution can be exceeded.
  • the present invention relates to a method for controlling printing processes, in particular for cutting register control or color register control or for measuring location in the color density control or color location control or any other printing process in which a measuring location on a substrate is measured by means of a sensor for controlling.
  • the measuring location on the printing material is measured by means of a stationary in the running direction or transport direction of the substrate pressure sensor, for which purpose the printing material is moved past the stationary sensor.
  • At least one actual value is detected, wherein the or each measured actual value is compared with each one pre-pressure based setpoint.
  • at least one control deviation determined from the or each actual value and the respective nominal value at least one actuating signal for the printing-technical process to be controlled is determined.
  • the respective actual value is first offset with the respective desired value with reduced resolution in a correlation method, wherein an interpolation is then carried out in the region of the maximum of the correlation to the subpixel approximation.
  • the correlation is preferably performed as normalized cross-correlation.
  • cor Normalized cross-correlation is performed using the following equations, where cor is the normalized cross-correlation, and where A is the actual value and B is the setpoint.
  • n corresponds to the number of measuring points in the actual value as well as the setpoint points in the nominal value and thus the resolution thereof, the resolution of the actual value corresponding to the resolution of the nominal value.
  • the sizes A and B are vectors with n elements.
  • the sizes A and B are matrices with n elements, wherein the n elements of the matrices are structured in columns and rows. It is also possible to use a plurality of one-dimensional sensors in order to provide as actual value a two-dimensional measuring field or a measuring matrix which comprises a plurality of one-dimensional measuring tracks or measuring vectors.
  • the correlation between the actual value and the desired value takes place at a reduced or reduced resolution, preferably with a reduction by a factor of 2 nm .
  • the position of the maximum in the correlation vector or the correlation matrix is highly quantized, but each value of the correlation vector or of the correlation matrix is a very precise floating-point number, so that the position can be determined by interpolation of the maximum in a very high resolution or accuracy can be determined.
  • Fig. 1 illustrates the inventive method for the case in which a one-dimensional sensor is used, wherein in Fig. 1 10 are plotted on the horizontal axis 10 values 11, 12 and 13 of a correlation vector resulting from the correlation performed at the reduced resolution.
  • Fig. 1 In the region around the maximum of the correlation vector, namely in the region of the value 12, there is a subpixel approximation by interpolation, wherein the curve 14 was obtained by interpolation.
  • the maximum of the correlation determined in this way by interpolation is in Fig. 1 denoted by the reference numeral 15.
  • Fig. 1 is the interpolation realized via a parabolic fit.
  • the method according to the invention can be used for cut-off register control, for color register control as well as for measuring location determination in color density control or chromaticity control.
  • the method according to the invention is suitable both for non-marking control methods and for control methods using pressure control marks.
  • the inventive method z in a markless color register control using a separate location for the ink black and a common location for the inks cyan, magenta and yellow are used.
  • a two-dimensional color camera is then preferably used.
EP08002539A 2007-02-15 2008-02-12 Procédé destiné à la régulation de processus d'impression Withdrawn EP1958774A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007007447A DE102007007447A1 (de) 2007-02-15 2007-02-15 Verfahren zur Regelung von drucktechnischen Prozessen

Publications (2)

Publication Number Publication Date
EP1958774A2 true EP1958774A2 (fr) 2008-08-20
EP1958774A3 EP1958774A3 (fr) 2011-06-01

Family

ID=39472103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08002539A Withdrawn EP1958774A3 (fr) 2007-02-15 2008-02-12 Procédé destiné à la régulation de processus d'impression

Country Status (2)

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EP (1) EP1958774A3 (fr)
DE (1) DE102007007447A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008052175A1 (de) * 2008-10-17 2010-04-22 Siemens Aktiengesellschaft Verfahren zur Datenübertragung bei Prozessgeräten
DE102008044154A1 (de) * 2008-11-28 2010-06-24 Koenig & Bauer Aktiengesellschaft Verfahren zur Einstellung des Diagonalregisters und/oder des Diagonalpassers einer Rotationsdruckmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237004C2 (de) 1992-11-02 1996-07-04 Mohndruck Reinhard Mohn Ohg Verfahren zur Online-Messung der Einfärbung von Druckprodukten
DE10149158A1 (de) 2001-10-04 2003-04-24 Wifag Maschf Verfahren und Vorrichtung zur Ermittlung der Position einer bedruckten Papierbahn

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5967050A (en) * 1998-10-02 1999-10-19 Quad/Tech, Inc. Markless color control in a printing press
DE19910835C1 (de) * 1999-03-11 2000-09-07 Innomess Elektronik Gmbh Verfahren zur Regelung einer Schnittposition an einer bedruckten Bahn für eine Rollenrotationsdruckmaschine
DE10218068B4 (de) * 2001-05-23 2017-07-27 Heidelberger Druckmaschinen Ag Verfahren zum Erstellen von Farbkalibrierungskennlinien
JP4598887B2 (ja) * 2001-09-28 2010-12-15 株式会社キーエンス ピラミッド構造サーチを使用したパターンマッチング方法、画像検出回路、画像処理プログラムおよびコンピュータで読み取り可能な記憶媒体
DE102004028056A1 (de) * 2004-04-22 2005-11-17 Maschinenfabrik Wifag Vorrichtung und Verfahren zur Erkennung von Registerfehlern
US7440123B2 (en) * 2005-07-20 2008-10-21 Eastman Kodak Company Adaptive printing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237004C2 (de) 1992-11-02 1996-07-04 Mohndruck Reinhard Mohn Ohg Verfahren zur Online-Messung der Einfärbung von Druckprodukten
DE10149158A1 (de) 2001-10-04 2003-04-24 Wifag Maschf Verfahren und Vorrichtung zur Ermittlung der Position einer bedruckten Papierbahn

Also Published As

Publication number Publication date
EP1958774A3 (fr) 2011-06-01
DE102007007447A1 (de) 2008-08-28

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