EP1958775B1 - Farbspaltungskorrekturverfahren - Google Patents

Farbspaltungskorrekturverfahren Download PDF

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Publication number
EP1958775B1
EP1958775B1 EP08100676.9A EP08100676A EP1958775B1 EP 1958775 B1 EP1958775 B1 EP 1958775B1 EP 08100676 A EP08100676 A EP 08100676A EP 1958775 B1 EP1958775 B1 EP 1958775B1
Authority
EP
European Patent Office
Prior art keywords
color
measuring
scanned
correction
scanned dots
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.)
Active
Application number
EP08100676.9A
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German (de)
English (en)
French (fr)
Other versions
EP1958775A3 (de
EP1958775A2 (de
Inventor
Adrian Dr.Kohlbrenner
Peter Dr. Ehbets
Wolfgang Geissler
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.)
X Rite Switzerland GmbH
Heidelberger Druckmaschinen AG
Original Assignee
X Rite Switzerland GmbH
Heidelberger Druckmaschinen AG
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Filing date
Publication date
Application filed by X Rite Switzerland GmbH, Heidelberger Druckmaschinen AG filed Critical X Rite Switzerland GmbH
Publication of EP1958775A2 publication Critical patent/EP1958775A2/de
Publication of EP1958775A3 publication Critical patent/EP1958775A3/de
Application granted granted Critical
Publication of EP1958775B1 publication Critical patent/EP1958775B1/de
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Anticipated expiration legal-status Critical

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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 correcting the measurement error caused by color-splitting-surface effects in the color measurement of a printed sheet on a running printing device according to the preamble of independent claim 1.
  • WO2005108083A1 a method and a measuring device for determining color and / or density values for the monitoring and / or control of the printing process in a printing device, especially a sheetfed offset printing machine described, wherein measuring fields of a sheet during the printing process directly in or on the current printing device photoelectrically measured and from the measured values obtained, the color and / or density values for the relevant measuring fields are formed.
  • the measured values are detected directly during the printing process with a measuring arrangement which is located inside the printing device - e.g. a sheetfed offset press or generally a printer - is installed.
  • a measuring arrangement which is located inside the printing device - e.g. a sheetfed offset press or generally a printer - is installed.
  • This type of measured value acquisition or measurement is referred to below as “inline”.
  • “externally” refers to a measured value acquisition outside the printing device in a stable state of the printed product.
  • Inline measuring technology is significantly more complex than conventional external color measurement technology.
  • the inline measurement must be carried out shortly after the paint application.
  • the color layer is not yet stable. It is influenced by various printing process parameters and color properties, which decay with different time constants. Depending on the situation, this can result in large differences between the inline measured values and corresponding external measured values on stable dry samples.
  • the process dependence complicates the interpretation of the measurement data. It is not clear if one measured variation was caused by a change in the color order or by a change in the process parameters. Inline and external measured values are therefore not directly comparable.
  • WO2005108083A1 describes a solution for this problem. It consists of a special design of measuring technology and measuring geometry in conjunction with computational correction methods for the inline measured values, which enable a conversion into standard-compliant color and density measured values for corresponding stable external samples (printed products).
  • the known approach thus includes a metrological component and a computational component.
  • the aim of the metrological component is to maximally reduce the influence of the process-dependent disruptive effects and to provide as unambiguous as possible measured values.
  • the remaining measured value deviations from externally determined, standard-compliant measured values are then compensated by means of numerical correction measures or models.
  • a preferred realization of the mentioned metrological correction component is according to WO2005108083A1 the use of polarizing filters in the illumination and receiver channels of the measuring head.
  • the polarization filters consist of linear polarizers and are installed with mutually perpendicular polarization axes in the illumination and receiver channel.
  • Such an arrangement of polarization filters eliminates or at least greatly attenuates the noise component that results from the surface effect.
  • the mathematical correction components are used for this.
  • polarizing filters as part of a metrological correction component
  • use of polarizing filters is also associated with various disadvantages.
  • a particular disadvantage is the strong attenuation of the light level. Also space problems, reduced optical imaging quality and costs are other negative factors.
  • a computational correction of the surface effect is most not practical because the disturbance of the ink layer immediately after the pressure at the location of measurement is typically still so strong that the surface effect that the measuring system sees is very pronounced. Especially with dark surfaces, the disturbing signal component, which comes from the surface effect, is large in comparison to the actual useful signal. Since the surface effect is an additive disturbance, a computational correction must ultimately be subtractive on the overall signal. Since, in particular, the printing process shows fluctuations and thus also the measurements fluctuate, such a subtractive correction is problematic or not practicable.
  • the present invention is intended to provide an alternative method for measuring value correction in inline measurements which does not have the above-described disadvantages of known methods of this type.
  • the purpose of the measured value correction is to minimize the differences between inline measurements and corresponding external measurements.
  • the basic idea of the invention is not to correct the surface effect as in WO2005108083A1 using a polarizer, but purely computationally based on image data of a line or area camera, which is mounted in the printing press and watching the just printed paper.
  • the method according to the invention is based on the finding that the surface effect caused by the color breakage or the color splitting, which adds a noise component to the measurement, occurs very locally and with an overall very low area coverage. If the print image is scanned with a camera, the disturbing effects in the camera image are recognizable as individual fine but at the same time extremely bright spots.
  • the basic idea of the invention consists in identifying these extremely bright spots in the image and eliminating their influence on the measurement result. This can be done by not taking into account these bright points for the formation of the measured values of interest or that the area ratio of these points on the total image and their average brightness is calculated, whereby the surface effect can be determined quantitatively and used to correct the measurement result.
  • the method according to the invention thus represents an image-based correction of the surface effect.
  • the method of the present invention requires an imaging sensor (e.g., a line or area camera) which is mounted so that it can record the print image in a suitable location at a high quality.
  • an imaging sensor e.g., a line or area camera
  • the method can also be implemented with a point-by-point scanning sensor if it has a sufficiently high spatial resolution.
  • Such a measuring system includes, for example, a line scan camera, which just printed sheet only a few centimeters after the nip still observed on the printing cylinder.
  • a line scan camera which just printed sheet only a few centimeters after the nip still observed on the printing cylinder.
  • a camera is equipped with suitable light sources and / or filters which define a meaningful for the pressure control spectral sensitivity of the camera.
  • a suitable for the needs of the pressure control camera is also equipped with at least three separate spectral sub-areas, such as cyan, magenta, yellow density.
  • the equipment with polarizing filters is not easy and therefore a computational correction makes particular sense.
  • this printer will continuously create images of the so-called colorimeter in the printing operation and transmit them to a measuring computer.
  • the measuring computer extracts therefrom, if not already done in an earlier processing stage, from the overall picture the image of the colorimeter and then finally the images of the individual measuring fields of the strip.
  • the measurement variables of interest for pressure control can then be determined from these partial images. This is advantageously done by suitable averaging of the measured values of the individual pixels within a measuring field.
  • the method according to the invention now provides that image or sampling points with a particularly large surface effect proportion and / or the strength of the surface effect as a whole are determined on the basis of the image data of the sub-images which are to be used for printing control. This is done by identifying in the image data those image or sampling points whose brightness exceeds a certain threshold.
  • the correction can now be carried out in a particularly simple embodiment of the invention so that the identified bright pixels (and possibly also adjacent Pixels) can be excluded from further processing. This means that the above-described averaging of the measured values of pixels for the formation of measured values for pressure control then takes place without the image or sampling points falsified by the strong surface effect.
  • the surface effect is determined quantitatively.
  • the quantitative knowledge of the surface effect is of particular interest because it enables the error-prone measurements of a second non-imaging system to be corrected. It is conceivable in particular a combination of an imaging subsystem for image inspection (ie, for example, for image defect detection, but not for color control of the printing press) with a non-imaging subsystem (eg punctiform spectrophotometer) for color control of the printing press (see. Fig. 4 ).
  • the described corrections correct only the measurement error component caused by the surface effect caused by the color cleavage (color break).
  • the corrections described thus represent a kind of "virtual" polarization filter.
  • In order to optimally correct the total error caused by the color splitting in practice even more computational corrections, as described in the document WO2005108083A1 are described performed. However, these are not the subject of the present invention and therefore require no further explanation.
  • the inventive method is not limited to the use of imaging measuring systems (line or area camera).
  • imaging measuring systems line or area camera
  • a non-imaging measuring system can be used, as for example in the document WO2005108083A1 is described.
  • imaging Sensors eg a camera system for image inspection.
  • the image information of the imaging sensors can then be used to correct the measurement error (caused by the surface effect) of the non-imaging sensors in the manner described above.
  • the image information can also be used to detect faulty measurement fields.
  • so lubrication (especially when starting the printing press) and defects (slugs) can be detected in the print image and so the corresponding measurement fields are excluded from the pressure control. This is particularly useful when using a combination of non-imaging and imaging sensors.
  • a printed sheet B located on the last printing cylinder Z of a printing press is scanned pointwise photoelectrically by means of an imaging scanning device in the form of a line camera K.
  • an imaging scanning device in the form of a line camera K.
  • the image data obtained in the form of the scanning signals of all sampled image or sampling points are represented by the box 1.
  • Suitable imaging scanners are known and not the subject of the present invention.
  • color and / or density measured values are formed in a conventional manner, which can be used for example for the control of the printing press.
  • the scanning signals of pixels from the measuring fields are thereby a color control strip usually present on the sheet evaluated.
  • the totality of the color and / or density measurements is represented by box 3.
  • Fig. 2 is a simplest embodiment of the inventive correction process shown in more detail.
  • the Fig. 3 shows a section of a typical measured brightness distribution over the sampling points of a sheet.
  • the abscissa indicates the individual sampling points i, the ordinates their brightnesses I.
  • the brightness of most sampling points is below the limit value I G.
  • the limit value I G Where the surface of the ink layer on the printing sheet is disturbed by the color break, extremely bright sampling points are measured. However, the number or area ratio of these extremely bright sampling points is relatively low.
  • Sample points lying above the limit I G brightness are, as already said, filtered out or not for the formation of the color and / or Density measured values taken into account.
  • the determination of the limit value I G is performed empirically on the basis of test measurements in such a way that inline measurement results and external measurement results are as comparable as possible.
  • a variant of the method according to the invention is shown, in which a combination of a line camera K and a point measuring device S, in particular a spectrophotometer, is used to scan the printed sheet B.
  • a point measuring device S in particular a spectrophotometer
  • the measuring signals of the point measuring device S are first preprocessed in the usual way (box 11) and then converted into color and / or density measured values (box 13).
  • a correction of the surface effect is performed (box 12), wherein the evaluation of the image data of the line scan camera is used.
  • further numerical corrections for the remaining measurement errors for the remaining measurement errors (box 14) and finally the output of the corrected color and / or density measured values (box 15) take place, for example. for the purpose of printing machine control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Spectrometry And Color Measurement (AREA)
EP08100676.9A 2007-02-15 2008-01-21 Farbspaltungskorrekturverfahren Active EP1958775B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007008017A DE102007008017A1 (de) 2007-02-15 2007-02-15 Farbspaltungskorrekturverfahren

Publications (3)

Publication Number Publication Date
EP1958775A2 EP1958775A2 (de) 2008-08-20
EP1958775A3 EP1958775A3 (de) 2010-04-14
EP1958775B1 true EP1958775B1 (de) 2014-08-06

Family

ID=39402664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08100676.9A Active EP1958775B1 (de) 2007-02-15 2008-01-21 Farbspaltungskorrekturverfahren

Country Status (5)

Country Link
US (1) US7894065B2 (zh)
EP (1) EP1958775B1 (zh)
JP (1) JP5497988B2 (zh)
CN (1) CN101244648B (zh)
DE (1) DE102007008017A1 (zh)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101844438B (zh) * 2009-03-25 2014-06-11 海德堡印刷机械股份公司 印刷机中的在线油墨调节
DE102010015034B4 (de) * 2009-04-30 2016-01-14 Heidelberger Druckmaschinen Ag Hybrid-Inline-Farbregelung für Druckmaschinen
DE102010017866A1 (de) * 2009-05-07 2010-11-25 Heidelberger Druckmaschinen Ag Verfahren zur Steuerung eines Farbwerkes einer Druckmaschine
DE102010051952B4 (de) * 2009-12-11 2022-01-20 Heidelberger Druckmaschinen Ag Analyse Farbauszüge
CN102416760B (zh) * 2010-09-24 2016-08-03 海德堡印刷机械股份公司 对版测量元件
DE102012004482A1 (de) 2011-03-24 2012-09-27 Heidelberger Druckmaschinen Aktiengesellschaft Nutzenfarboptimierung
DE102012012517A1 (de) * 2011-07-15 2013-01-17 Heidelberger Druckmaschinen Aktiengesellschaft Feuchtmittelregelung in einer Druckmaschine
CN102909950B (zh) 2011-08-03 2015-12-09 海德堡印刷机械股份公司 在印刷速度变化时输墨装置的控制
DE102012016832A1 (de) 2011-09-22 2013-03-28 Heidelberger Druckmaschinen Ag Farbregelung auf letzter Farbauftragswalze
DE102012020911A1 (de) 2011-11-11 2013-05-16 Heidelberger Druckmaschinen Ag Färbungswächter für Druckmaschinen

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DE3265740D1 (en) * 1981-04-03 1985-10-03 Gretag Ag Method and device for the colorimetric analysis of a printed colour test scale
JPS6122949A (ja) * 1984-07-12 1986-01-31 Shinohara Tekkosho:Kk オフセツト印刷機のインキロ−ラ−装置
US5182721A (en) * 1985-12-10 1993-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Process and apparatus for controlling the inking process in a printing machine
ES2023135B3 (es) * 1986-04-18 1992-01-01 Heidelberger Druckmasch Ag Determinacion de errores de registro de impresion multicolor.
DE3830732C2 (de) * 1988-09-09 2000-05-25 Heidelberger Druckmasch Ag Verfahren zur Feuchtmittelführung bei einer Offset-Druckmaschine
JPH04203955A (ja) * 1990-11-29 1992-07-24 Narumi China Corp 印刷パターンの検査方法
US6081608A (en) * 1995-02-09 2000-06-27 Mitsubishi Jukogyo Kabushiki Kaisha Printing quality examining method
US5724259A (en) * 1995-05-04 1998-03-03 Quad/Tech, Inc. System and method for monitoring color in a printing press
DE19749064A1 (de) * 1997-11-06 1999-05-12 Heidelberger Druckmasch Ag Verfahren zur Ermittlung von Farbwertgradienten
US6796240B2 (en) * 2001-06-04 2004-09-28 Quad/Tech, Inc. Printing press register control using colorpatch targets
DE10257981A1 (de) * 2002-01-15 2003-07-24 Heidelberger Druckmasch Ag Farbsteuerung einer Druckmaschine mit spektralbasierter Farbmessung
DE102004021599A1 (de) 2004-05-03 2005-12-01 Gretag-Macbeth Ag Verfahren zur Ermittlung von Farb- und/oder Dichtewerten und für das Verfahren ausgebildete Druckeinrichtungen
AT502095B1 (de) * 2005-06-21 2007-11-15 Arc Seibersdorf Res Gmbh Verfahren zur prüfung von gegenständen
US7636163B2 (en) * 2007-07-23 2009-12-22 X-Rite, Inc. Color measurement device with error detection

Also Published As

Publication number Publication date
CN101244648B (zh) 2011-03-16
US7894065B2 (en) 2011-02-22
EP1958775A3 (de) 2010-04-14
US20080201110A1 (en) 2008-08-21
JP5497988B2 (ja) 2014-05-21
DE102007008017A1 (de) 2008-08-21
CN101244648A (zh) 2008-08-20
EP1958775A2 (de) 2008-08-20
JP2008195073A (ja) 2008-08-28

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