EP0730959A1 - Verfahren zur Herstellung eines Referenzmodells für automatische Qualitätskontrolle von Bildern auf Papier - Google Patents

Verfahren zur Herstellung eines Referenzmodells für automatische Qualitätskontrolle von Bildern auf Papier Download PDF

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Publication number
EP0730959A1
EP0730959A1 EP96810121A EP96810121A EP0730959A1 EP 0730959 A1 EP0730959 A1 EP 0730959A1 EP 96810121 A EP96810121 A EP 96810121A EP 96810121 A EP96810121 A EP 96810121A EP 0730959 A1 EP0730959 A1 EP 0730959A1
Authority
EP
European Patent Office
Prior art keywords
images
printed
model
value
pixel
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.)
Granted
Application number
EP96810121A
Other languages
English (en)
French (fr)
Other versions
EP0730959B1 (de
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/de
Application granted granted Critical
Publication of EP0730959B1 publication Critical patent/EP0730959B1/de
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 method of producing a reference model, by electronic means, intended to be used for the automatic control of the print quality of an image on paper, in particular for value papers, said image being composed of drawings printed in at least two distinct printing phases.
  • electronic inspection means comprising one or more black and white or color cameras, to capture the images to be inspected .
  • These images consist of matrices, usually rectangular comprising numbers which represent the quality of the reflected light or in other words the densitometric value of the pixels in which the image is subdivided.
  • the number of pixels in an image is a function of the resolution of the camera.
  • a monocromatic system black and white
  • the image is described by a single matrix, while in polychromatic systems, the description consists of as many matrices as the chromatic channels used.
  • RGB type descriptions Red, Green, Blue
  • a model of acceptable print quality is constructed.
  • a species average image that is to say an image which is described by a matrix in which one associates with each pixel the average value which this one has in the group of test sheets.
  • Another method associates with each pixel two values, one is the minimum value which has been reached in the group of test sheets and the other the maximum value.
  • two matrices are obtained per color channel.
  • each pixel of the image to be inspected is compared with the pixel of the model thus obtained. If the difference exceeds a predetermined threshold value or if it is outside the minimum-maximum interval, the pixel is considered to have a printing defect.
  • the number of defective pixels determines the possible rejection of the image according to the quality which one wants to obtain and which is determined beforehand.
  • the images are printed with different printing techniques, such as offset, intaglio, etc.
  • different printing techniques such as offset, intaglio, etc.
  • the paper first passes through a printing system according to the first phase and a first design is affixed and then passes through a second printing system for the second printing phase allowing to affix on paper a second drawing.
  • the problem of print quality there is also the problem of the relative registration of the drawings printed during the different phases. Indeed, differences may remain between two images printed in this way concerning the drawings which are printed in different phases, if only because of the deformation of the paper.
  • the relative misalignments between the printing phases are measured above all using the pixels identified during the preparation of the models.
  • the models are then combined taking into account the way that the different phases are printed successively on the sheets to obtain a single reference model whose arrangement 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, it is necessary to print as many groups of sheets representative of the desired printing quality, as well as printing phases.
  • the object of the invention is to propose a process for the preparation of the reference model which does not have the drawbacks of what is currently being done.
  • the proposed method allows, in using the minimum pixel values between the different values found when capturing the image, producing the model of the printed design during the same printing phase and this directly from the fully printed images as during production normal in series. What should change between two images, whose drawings printed during a printing phase are aligned, are the drawings printed during a subsequent printing phase.
  • the method allows the production of a reference model starting from a certain number of test images printed as if it were a serial printing.
  • a pixel when a pixel has the same non-zero value on more than one model, it is assigned to a single model by setting this value to zero for the 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.
  • Figures 1 and 2 show two images to which the method according to the invention is applied.
  • FIGS. 1 and 2 we have represented two images each composed of a square a1, respectively a2 and a triangle b1, respectively b2.
  • the squares a1, a2 were printed during a first printing phase, for example intaglio and the triangles during 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 FIG. 1, the squares a1 and a2.
  • a scan is carried out along axes S1 and S2. The pixel values found on these axes are reported on the bottom of the figure.
  • a pixel has the same value on more than one model, this means that the pixel can be indifferently associated with the one or other of the models, therefore all the pixels of this type are associated with a single model and the value equal to zero for the others.
  • a pixel has different values on more than one model and different from zero, we associate with the model where the value is the highest the absolute value of the difference in values of said pixel and we put the value equal to zero on the model with the lower value.
  • the models which are not printed with the covering ink are recomposed by omitting calculations of the minimum pixels which are also printed with the covering ink and of course the models obtained for the designs printed with the covering ink are kept.

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 Verfahren zur Herstellung eines Referenzmodells für automatische Qualitätskontrolle von Bildern auf Papier Expired - Lifetime EP0730959B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI950430 1995-03-07
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

Publications (2)

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

Family

ID=11370795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810121A Expired - Lifetime EP0730959B1 (de) 1995-03-07 1996-03-04 Verfahren zur Herstellung eines Referenzmodells für automatische Qualitätskontrolle von Bildern auf Papier

Country Status (12)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1790473A1 (de) 2005-11-25 2007-05-30 Kba-Giori S.A. Verfahren zur Erfassung vom Eintreten von Druckfehlern auf Druckbogen während deren Bearbeitung in einer Druckmaschine
US8571327B2 (en) 2006-09-06 2013-10-29 Kba-Notasys Sa Method for controlling the quality of printed documents based on pattern matching
US8613254B2 (en) 2005-11-25 2013-12-24 Kba-Notasys Sa Method for detection of occurrence of printing errors on printed substrates during processing thereof on a printing press

Families Citing this family (6)

* 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
US7593936B2 (en) * 2003-08-11 2009-09-22 Triumfant, Inc. Systems and methods for automated computer support
AU2009251147B2 (en) * 2009-12-23 2012-09-06 Canon Kabushiki Kaisha Dynamic printer modelling for output checking

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5022089A (en) * 1990-01-19 1991-06-04 Wilson Monti R Method and apparatus for fast registration using crosshair register marks
EP0444583A2 (de) * 1990-03-02 1991-09-04 MAN Roland Druckmaschinen AG Auf Bedruckstoff aufgedruckte Marken zum Erfassen des Passers
EP0527285A2 (de) * 1991-08-12 1993-02-17 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Verfahren zum Beurteilen von bedruckten Bogen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4430749A (en) * 1981-06-30 1984-02-07 Siemens Gammasonics, Inc. Medical imaging apparatus and method for furnishing difference images
JP2663726B2 (ja) * 1991-01-08 1997-10-15 株式会社デンソー 複層状態検査装置
EP0540833B1 (de) * 1991-08-12 1997-04-23 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Qualitätskontrolle einer Bildvorlage z. B. eines gedruckten Musters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5022089A (en) * 1990-01-19 1991-06-04 Wilson Monti R Method and apparatus for fast registration using crosshair register marks
EP0444583A2 (de) * 1990-03-02 1991-09-04 MAN Roland Druckmaschinen AG Auf Bedruckstoff aufgedruckte Marken zum Erfassen des Passers
EP0527285A2 (de) * 1991-08-12 1993-02-17 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Verfahren zum Beurteilen von bedruckten Bogen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1790473A1 (de) 2005-11-25 2007-05-30 Kba-Giori S.A. Verfahren zur Erfassung vom Eintreten von Druckfehlern auf Druckbogen während deren Bearbeitung in einer Druckmaschine
US8613254B2 (en) 2005-11-25 2013-12-24 Kba-Notasys Sa Method for detection of occurrence of printing errors on printed substrates during processing thereof on a printing press
US8571327B2 (en) 2006-09-06 2013-10-29 Kba-Notasys Sa Method for controlling the quality of printed documents based on pattern matching

Also Published As

Publication number Publication date
US5778088A (en) 1998-07-07
CA2171165A1 (en) 1996-09-08
RU2161792C2 (ru) 2001-01-10
JP2007168449A (ja) 2007-07-05
ITMI950430A0 (it) 1995-03-07
JPH08276569A (ja) 1996-10-22
AU4585296A (en) 1996-09-19
UA45320C2 (uk) 2002-04-15
CN1074996C (zh) 2001-11-21
ITMI950430A1 (it) 1996-09-07
IT1276010B1 (it) 1997-10-24
ATE188916T1 (de) 2000-02-15
DE69606206T2 (de) 2000-08-10
CA2171165C (en) 2007-04-17
CN1138692A (zh) 1996-12-25
KR100362023B1 (ko) 2003-05-09
KR960033772A (ko) 1996-10-22
EP0730959B1 (de) 2000-01-19
AU692991B2 (en) 1998-06-18
DE69606206D1 (de) 2000-02-24

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