EP0730959B1 - Procédé de production d'un modèle de référence destiné à être utilisé pour le contrôle automatique de la qualité d'impression d'une image sur du papier - Google Patents

Procédé de production d'un modèle de référence destiné à être utilisé pour le contrôle automatique de la qualité d'impression d'une image sur du papier Download PDF

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Publication number
EP0730959B1
EP0730959B1 EP96810121A EP96810121A EP0730959B1 EP 0730959 B1 EP0730959 B1 EP 0730959B1 EP 96810121 A EP96810121 A EP 96810121A EP 96810121 A EP96810121 A EP 96810121A EP 0730959 B1 EP0730959 B1 EP 0730959B1
Authority
EP
European Patent Office
Prior art keywords
images
printed
model
pixel
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.)
Expired - Lifetime
Application number
EP96810121A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0730959A1 (fr
Inventor
Luigi Stringa
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.)
KBA Notasys SA
Original Assignee
De la Rue Giori SA
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 De la Rue Giori SA filed Critical De la Rue Giori SA
Publication of EP0730959A1 publication Critical patent/EP0730959A1/fr
Application granted granted Critical
Publication of EP0730959B1 publication Critical patent/EP0730959B1/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
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/30—Character or syllable selection controlled by recorded information

Definitions

  • the present invention relates to a production method a reference model, by electronic means, intended to be used for automatic control of the print quality of an image on paper, especially for securities, said image being composed of designs printed in at least two phases separate printing.
  • an acceptable print quality model is built.
  • Another method associates two values with each pixel, one is the minimum value that has been reached in the group of test sheets and the other the maximum value. So, for each image, we have two matrices, one with the minimum value and the other with the value maximum. Of course, if it is an image polychromatic, we obtain two matrices per channel color.
  • each pixel of the image to be inspected is confronted with the pixel of the model thus obtained. If the difference exceeds a predetermined threshold value or if it is within outside the minimum-maximum range, the pixel is considered to have a printing defect.
  • the number of defective pixels determines the possible rejection the image depending on the quality you want obtain and which is previously determined.
  • the models are then combined taking into account the way the different phases are printed successively on the sheets to obtain a model single reference whose layout corresponds to the arrangement of the drawings in the images to be checked. Then, each image is compared with the model thus produced.
  • This process is complex and particularly expensive for the printer because for each production batch, print as many groups of sheets representative of the desired print quality, as well as printing phases.
  • the object of the invention is to propose a method for preparation of the reference model not presenting the disadvantages of what is currently being done.
  • the proposed method allows, taking the minimum pixel values between the different values found when entering of the image, to produce the model of the printed design during the same printing phase and this directly from fully printed images as in of normal serial production. What should change between two images, including the drawings printed during of a printing phase are aligned, these are the drawings printed during a subsequent printing phase.
  • a pixel when a pixel has the same non-zero value on more than one model, we attribute it to a single model by setting this value to zero for other models. This simplifies the production of models because if a pixel has the same value on more than one model, it means that it may well belong to both of them.
  • Figures 1 and 2 show two images in which the method according to the invention is applied.
  • Figures 1 and 2 we have represented two images each composed of a square a1, respectively a2 and of a triangle b1, respectively b2.
  • the squares a1, a2 were printed during a first printing phase, for example intaglio and triangles when a second printing phase, for example offset.
  • the relative displacement of two drawings, a2 and b2, between the two images is exaggerated to bring out the method according to the invention.
  • the two images (a1; b1) and (a2; b2) taken in the test group are aligned according to the drawing printed during a first printing phase, namely in Figure 1, the squares a1 and a2.
  • a scan is carried out along axes S1 and S2. We report the pixel values found on these axes on the bottom of the figure.
  • Capturing images or scans is done well, heard, using appropriate and known cameras since they are currently used to control the quality.
  • one pixel if during production different models corresponding to drawings printed in different phases, one pixel present the same value on more than one model, it means that the pixel can be indifferently associated with one or the other of the models, so all the pixels of this type are associated with a unique model and we put the value equal to zero for the others.
  • a pixel has different values on more than one model and nonzero we associate with the model where the value is the highest the absolute value of the difference of values of said pixel and we put the equal value to zero on the model with the lower value.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Image Processing (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Paper (AREA)
  • Image Analysis (AREA)
  • Printing Methods (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Facsimiles In General (AREA)
  • Feedback Control In General (AREA)
  • Circuits Of Receivers In General (AREA)
EP96810121A 1995-03-07 1996-03-04 Procédé de production d'un modèle de référence destiné à être utilisé pour le contrôle automatique de la qualité d'impression d'une image sur du papier Expired - Lifetime EP0730959B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95MI000430A IT1276010B1 (it) 1995-03-07 1995-03-07 Procedimento per produrre un modello di riferimento destinato ad essere utilizzato per il controllo automatico della qualita' di
ITMI950430 1995-03-07

Publications (2)

Publication Number Publication Date
EP0730959A1 EP0730959A1 (fr) 1996-09-11
EP0730959B1 true EP0730959B1 (fr) 2000-01-19

Family

ID=11370795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810121A Expired - Lifetime EP0730959B1 (fr) 1995-03-07 1996-03-04 Procédé de production d'un modèle de référence destiné à être utilisé pour le contrôle automatique de la qualité d'impression d'une image sur du papier

Country Status (12)

Country Link
US (1) US5778088A (it)
EP (1) EP0730959B1 (it)
JP (2) JPH08276569A (it)
KR (1) KR100362023B1 (it)
CN (1) CN1074996C (it)
AT (1) ATE188916T1 (it)
AU (1) AU692991B2 (it)
CA (1) CA2171165C (it)
DE (1) DE69606206T2 (it)
IT (1) IT1276010B1 (it)
RU (1) RU2161792C2 (it)
UA (1) UA45320C2 (it)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MC2479A1 (fr) 1998-09-07 1999-04-27 Luigi Stringa Inspection automatique de la qualité d'impression par un modèle élastique
MC2491A1 (fr) * 1999-06-21 1999-11-22 Stringa Luigi Reconnaissance automatique de caractères sur fond structuré par combinaison des modèles du fond et des caractères
US6639999B1 (en) * 1999-11-04 2003-10-28 Eastman Kodak Company Apparatus for assessing overall quality of hardcopy images
US6658139B1 (en) * 1999-11-04 2003-12-02 Eastman Kodak Company Method for assessing overall quality of digital images
WO2005017690A2 (en) * 2003-08-11 2005-02-24 Chorus Systems, Inc. Systems and methods for creation and use of an adaptive reference model
CN102381019B (zh) * 2005-11-25 2014-04-30 卡巴-诺塔赛斯有限公司 在印刷机处理期间用于探测在印刷基质上印刷错误发生的方法
EP1790473A1 (en) 2005-11-25 2007-05-30 Kba-Giori S.A. Method for detection of occurrence of printing errors on printed substrates during processing thereof on a printing press
EP1901241A1 (en) 2006-09-06 2008-03-19 Kba-Giori S.A. Method for controlling the quality of printed documents based on pattern matching
AU2009251147B2 (en) * 2009-12-23 2012-09-06 Canon Kabushiki Kaisha Dynamic printer modelling for output checking

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731842C3 (de) * 1977-07-14 1983-12-22 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Verfahren zum Ermitteln von durch Schieben und/oder Dublieren hervorgerufenen Veränderungen im Rastertonwert einer Farbe bedruckter Bogen oder Bahnen
US4430749A (en) * 1981-06-30 1984-02-07 Siemens Gammasonics, Inc. Medical imaging apparatus and method for furnishing difference images
DE3468367D1 (en) * 1983-11-04 1988-02-11 Gretag Ag Method and device for judging the printing quality of a printed object, preferably printed by an offset printing machine, and offset printing machine provided with such a device
US5022089A (en) * 1990-01-19 1991-06-04 Wilson Monti R Method and apparatus for fast registration using crosshair register marks
DE4006525A1 (de) * 1990-03-02 1991-09-12 Roland Man Druckmasch Auf bedruckstoff aufgedruckte marken zum erfassen des passers
US5144566A (en) * 1990-06-14 1992-09-01 Comar, Inc. Method for determining the quality of print using pixel intensity level frequency distributions
JP2663726B2 (ja) * 1991-01-08 1997-10-15 株式会社デンソー 複層状態検査装置
DE4142481A1 (de) * 1991-08-12 1993-02-18 Koenig & Bauer Ag Qualitaetskontrolle einer bildvorlage z. b. eines gedruckten musters
EP0540833B1 (de) * 1991-08-12 1997-04-23 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Qualitätskontrolle einer Bildvorlage z. B. eines gedruckten Musters

Also Published As

Publication number Publication date
CA2171165A1 (en) 1996-09-08
AU692991B2 (en) 1998-06-18
EP0730959A1 (fr) 1996-09-11
JP2007168449A (ja) 2007-07-05
KR960033772A (ko) 1996-10-22
ITMI950430A1 (it) 1996-09-07
KR100362023B1 (ko) 2003-05-09
ITMI950430A0 (it) 1995-03-07
CN1074996C (zh) 2001-11-21
DE69606206T2 (de) 2000-08-10
IT1276010B1 (it) 1997-10-24
RU2161792C2 (ru) 2001-01-10
CA2171165C (en) 2007-04-17
CN1138692A (zh) 1996-12-25
JPH08276569A (ja) 1996-10-22
ATE188916T1 (de) 2000-02-15
AU4585296A (en) 1996-09-19
DE69606206D1 (de) 2000-02-24
US5778088A (en) 1998-07-07
UA45320C2 (uk) 2002-04-15

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