EP0741027B1 - Vorrichtung zur Bildinspektion - Google Patents
Vorrichtung zur Bildinspektion Download PDFInfo
- Publication number
- EP0741027B1 EP0741027B1 EP96105188A EP96105188A EP0741027B1 EP 0741027 B1 EP0741027 B1 EP 0741027B1 EP 96105188 A EP96105188 A EP 96105188A EP 96105188 A EP96105188 A EP 96105188A EP 0741027 B1 EP0741027 B1 EP 0741027B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- image
- inspection
- inspection area
- coordinate
- areas
- 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
Links
Images
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 device for image inspection of the printed image Product of a printing press.
- Devices of the type mentioned at the beginning serve this purpose, in particular in inline operation Image errors of the printed image of a product created using a printing machine detect.
- EP 0 527 285 A2 describes a method for assessing printed sheets, in which a template of the images printed in the printing press in a variety of picture elements, and these picture elements maximum and minimum permissible color density values can be assigned.
- the invention has for its object a device for image inspection specify which is capable of errors in the printed image with simple effort localize within a very short time.
- the configuration according to the invention thus allows the fault to be localized by means of the marked inspection area, which is a clear drawing of the Represents the total printed image, the total printed image using a plurality of Inspection areas is completely and without overlap. So it will not only pointed out an error in the printed image and the associated sheets, for example, by means of a waste switch of the printing press discarded, but there is a concrete error localization, that means it becomes the area (Inspection area) marked, in which the error located.
- the inspection areas are each square or have a rectangular layout.
- the Inspection areas in the manner of a grid over the area of the Distributed printed image, with corresponding X and Y coordinates with respect to the preferably Cartesian Coordinate grids exist.
- the width (X coordinate) is preferred Inspection area as large as the respective zone width of ink zones of an inking unit of the printing press. It is advantageous if the height (Y coordinate) of everyone Inspection area just as large as the respective zone width the ink zones of the printing unit's inking unit. Lies for example a 102-format sheet with a Zone division of 32.5 mm before, the total area is in 32 x 22 square inspection areas divided (X coordinate; Y coordinate).
- the inspection areas have addresses assigned. Because of the addresses, the respective Inspection area can be clearly determined.
- the addresses are initially by a value on the X coordinate and then (for example, with a comma separated) by a value on the Y coordinate featured. So means: (1,1) first latitude interval along the X axis and first height interval along the Y-axis, therefore, the field of the printed sheet at the bottom left. Accordingly, (32,22) is the one on the top right Inspection area of the printed image of a printed sheet featured.
- Each address is preferably the inspection area assigned at least one memory cell of a memory, wherein a value is written into the memory cell that the inspection result of the associated inspection area corresponds. For example, it is possible to set the value "0" in to write the memory cell if the associated Inspection area is error-free, that is, the one with the Target image data of an error-free subject compared Actual image data did not produce any deviation, or only deviations within one permissible tolerance threshold is shown, so that from a Error-free is to be assumed. Is in one or more Inspection areas at least one error in which Target-actual comparison due to exceeding the Tolerance threshold was recognized, so this one Inspection area associated memory cell of the memory the value "1" inscribed, which is an error indicates.
- the memory can thus be constructed very simply be because it only has a number of memory cells must correspond to the number of inspection areas.
- the size of the inspection areas can of course vary from Print job can be specified to print job or even be changed during a print job. The bigger the The number of inspection areas, the finer the grid error detection.
- the grid formation can preferably depending on the subject, that is a clear print image does not require fine screening, but is also by means of a rough grid of Inspection areas flawless with regard to a Fault detection can be recorded. Confusing subjects should rather with a narrow grid.
- the print image representative pixels in the X and Y coordinate directions by the specified number of pixels per Inspection area divided in X and Y direction are.
- This pixel structure is the imaginary grid of the Inspection areas overlaid, being within one Inspection area a certain number of pixels X direction and a corresponding number in the Y direction. For example, if the total number of pixels X coordinate by the number of pixels in X coordinates divided in the direction of an inspection area, that is, if there is an integer division, the number of located along the X coordinate direction Inspection areas set.
- a corresponding provision the number of divisions in the Y direction is given by that divides the total number of pixels in the Y direction is determined by the number of pixels in the Y direction an inspection area.
- the address is one of an error inspection area affected by one or more errors a location circuit is determined that the Pixel coordinates (X, Y) of the fault location modulo der Number of pixels of the width and the height of an inspection area calculates. This way, the affected inspection area.
- the error is in the 6th inspection area of on the left in the 3rd row of the one below the other Rows of inspection areas; therefore has this inspection area the address (6.3).
- the rest of 25 shown is for the determination of the error by means of the inspection areas not significant; it indicates the number of Pixels calculated from the corresponding Limitation of the associated inspection area.
- the address is a defective inspection area for marking the associated inspection area on a display, for example on a monitor.
- Means This address can be viewed on a monitor, for example Mark the printed image or target image shown by the associated inspection area, for example by means of a Overlay frame is marked.
- the device for image inspection shown in FIG. 1 has an image acquisition device B, not shown on, which is constructed as a camera and actual image data from the Print image of a product of a not shown Printing machine determined. This actual image data acquisition takes place during printing, i.e. inline operation.
- the Actual image data are, on the one hand, a comparison circuit 1 and on the other hand supplied to a counter 2.
- the comparison circuit 1 receives an input variable from one Memory 3 target image data.
- the comparison circuit 1 takes a target-actual comparison and provides 4 at its output a deviation between target and actual data error data F available that a threshold circuit 5 and a Differential image data circuit 6 are supplied.
- To the Threshold circuit 5 is also a Threshold data circuit 7 connected.
- the counter 2 has an X counter and a Y counter, the in each case the pixels of the actual image data corresponding to the Scanned by the camera in the X coordinate direction and in Y coordinate direction counts.
- a modulo circuit marked which carries out an addressing to which in the below is discussed in more detail.
- With 11 is one Product, namely a bow marked the one Print image 12, which by means of a printing process the press, not shown, was created.
- the Print image 12 is in preselectable large inspection areas 13 divided, in the manner of a grid with corresponding X and Y coordinates are arranged, as shown in FIG. 2 is shown.
- the widths and heights (X and Y direction) of the individual inspection surfaces 13 can correspond to the zone division of color zones of the printing unit or of the printing units of the printing press.
- 32 inspection areas in the X direction and 22 inspection areas in the Y direction are thus provided by the row-shaped arrangement 32 x 22 inspection areas which divide the overall subject.
- the subject is composed of closely spaced pixels in the X and Y directions, the number of pixels per inspection surface 13 corresponding to the X direction M x and the Y direction M y .
- the total number of pixels in the X direction corresponds to the value X and the total number of pixels in the Y direction of the subject of the printed image 12 corresponds to the value Y, the values X and Y being detected by the counter circuits of the counter 2. If the number of pixels X or Y detected in each case when the print image 12 is scanned is divided by the number M x or M y of an inspection area 13 by means of the modulo circuit 10, the result corresponds to the integer division of an address into X and Y Direction that characterizes the corresponding inspection area 13.
- the last inspection area 13 is identified by (32, 22), which is also error-free in the exemplary embodiment, since it has the value "0".
- a memory cell 16 located between these two end memory cells 16 has the value "1", and it has the address (X / M x , Y / M y ), which thus means that an error has been found, for example due to use , corresponds.
- the memory 15 is connected to a processor 17 which interacts with a monitor 18. There is also a connection between the differential image data circuit 6 and the processor 17.
- those Memory cells 16, the inspection area provided with errors 13 are assigned, identified by a flag, so that the memory contents reflect the errors of the represents the associated printed image of the printed product.
- the addresses can be used to on the display, for example the monitor image, the Target image or the actual image the affected Mark inspection areas that have defects.
- a another reaction can be that by means of existing coordinates (addresses) only part of a Difference image (target-actual deviation) to the computer or transferred to the monitor that has content, which are not equal to zero, i.e. affected by an error are. In this way, the actual picture becomes shown, but only in some areas, which is due to this data selection is accelerated processing, which is advantageous for the following, for example (Software) operations, such as a detailed one Error analysis.
- inspection areas can be used cheaply to Speed up operations. For example by "clicking" an inspection area on the monitor shown target or actual image triggered an action such as locking this image area for the inspection.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Image Analysis (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Image Processing (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Description
- Fig. 1
- ein Blockdiagramm des Aufbaus der Vorrichtung zur Bildinspektion und
- Fig. 2
- ein in Inspektionsflächen aufgeteiltes Sujet.
- 1
- Vergleichsschaltung
- 2
- Zähler
- 3
- Speicher
- 4
- Ausgang
- 5
- Schwellenschaltung
- 6
- Differenz-Bilddaten-Schaltung
- 7
- Schwellendaten-Schaltung
- 8
- Ausgang
- 9
- Ausgang
- 10
- Modulo-Schaltung
- 11
- Produkt (Bogen)
- 12
- Druckbild
- 13
- Inspektionsflächen
- 14
- Tor-Schaltung
- 15
- Speicher
- 16
- Speicherzellen
- 17
- Prozessor
- 18
- Monitor
- B
- Bilderfassungseinrichtung
- F
- Fehlerdaten
Claims (8)
- Vorrichtung zur Bildinspektion des Druckbildes eines Produkts einer Druckmaschine, mit einer Bilderfassungseinrichtung, die Ist-Bilddaten (Ist) vom Produkt liefert, welche mittels einer Vergleichsschaltung (1) mit Soll-Bilddaten (Soll) eines fehlerfreien Sujets verglichen werden, wobei eine vorwählbare Einteilung des Druckbildes in Inspektionsflächen (13) erfolgt, und beim Auftreten eines von der Vergleichsschaltung (1) erkannten Fehlers die zugehörige Inspektionsfläche (13) gekennzeichnet wird,
dadurch gekennzeichnet,
daß das von der Bilderfassungseinrichtung erfaßte Druckbild des Produkts auf einem Monitor (18) wiedergegeben wird, und daß eine fehlerbehaftete Inspektionsfläche (13) im auf dem Monitor (18) wiedergegebenen Druckbild mittels eines Overlay-Rahmens gekennzeichnet wird. - Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Inspektionsflächen (13) jeweils quadratischen oder rechteckigen Grundriß aufweisen. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Breite (X-Koordinate) jeder Inspektionsfläche (13) ebenso groß wie die jeweilige Zonenbreite von Farbzonen eines Farbwerks der Druckmaschine ist. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Höhe (Y-Koordinate) jeder Inspektionsfläche (13) ebenso groß wie die jeweilige Zonenbreite der Farbzone des Farbwerks der Druckmaschine ist. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß den Inspektionsflächen (13) Adressen zugeordnet sind. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß jeder Adresse der Inspektionsflächen (13) mindestens eine Speicherzelle (16) eines Speichers (15) zugeordnet ist, wobei in die Speicherzelle (16) ein Wert eingeschrieben wird, der dem Inspektionsergebnis der zugehörigen Inspektionsfläche (13) entspricht. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß zur Bildung der Inspektionsflächen (13) die das Druckbild darstellenden Bildpunkte (X, Y) in X- und in Y-Koordinatenrichtung durch die vorgebbare Anzahl der Bildpunkte (Mx, My) pro Inspektionsfläche (13) in X- und in Y-Richtung dividiert wird. - Vorrichtung nach eines der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Adresse einer von einem Fehler betroffenen Inspektionsfläche (13) mittels einer Ortungsschaltung ermittelt wird, die die Bildpunktkoordinaten (X, Y) des Fehlerorts modulo der Bildpunktzahl der Breite und der Höhe eines Inspektionsfelds (13) rechnet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19516352 | 1995-05-04 | ||
DE19516352A DE19516352A1 (de) | 1995-05-04 | 1995-05-04 | Vorrichtung zur Bildinspektion |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0741027A2 EP0741027A2 (de) | 1996-11-06 |
EP0741027A3 EP0741027A3 (de) | 1998-03-25 |
EP0741027B1 true EP0741027B1 (de) | 2000-07-12 |
Family
ID=7761054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96105188A Expired - Lifetime EP0741027B1 (de) | 1995-05-04 | 1996-04-01 | Vorrichtung zur Bildinspektion |
Country Status (3)
Country | Link |
---|---|
US (1) | US6449385B1 (de) |
EP (1) | EP0741027B1 (de) |
DE (2) | DE19516352A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10218068B4 (de) * | 2001-05-23 | 2017-07-27 | Heidelberger Druckmaschinen Ag | Verfahren zum Erstellen von Farbkalibrierungskennlinien |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3350477B2 (ja) * | 1999-04-02 | 2002-11-25 | セイコーインスツルメンツ株式会社 | ウエハ検査装置 |
DE19940879A1 (de) * | 1999-08-27 | 2001-03-08 | Innomess Elektronik Gmbh | Verfahren und Vorrichtung zum automatisierten Vergleich von Druckbildern an Druckmaschinen |
CH694160A5 (fr) * | 2000-05-11 | 2004-08-13 | Bobst Sa | Dispositif de gestion des défauts d'impression détectés au sein d'une machine d'impression. |
DE10024070A1 (de) * | 2000-05-17 | 2001-11-22 | Kolbus Gmbh & Co Kg | Kontrolleinrichtung zur Anwendung in einer Maschine zur Druckbogenweiterverarbeitung zum Erkennen von Druckbogen |
EP1254767B1 (de) * | 2000-08-14 | 2010-01-20 | Dainippon Screen Mfg. Co., Ltd. | Druckmaschine |
AU2001282337A1 (en) * | 2000-08-26 | 2002-03-13 | Flow Research Evaluation Diagnostics Limited | A monitoring system |
US7061630B2 (en) * | 2000-12-15 | 2006-06-13 | Xerox Corporation | System architecture and method for verifying process correctness in a document processing system |
US6742454B2 (en) * | 2001-10-30 | 2004-06-01 | Heidelberger Druckmaschinen Ag | Method for modifying an image surface of a printing plate |
CA2424192C (en) * | 2002-04-05 | 2011-02-15 | John Howard Stewart | Door seal drilling and pinning |
US20030193684A1 (en) * | 2002-04-10 | 2003-10-16 | Kendall David R. | Method and system for diagnosing printing defects |
US7054017B2 (en) * | 2002-04-30 | 2006-05-30 | Hewlett-Packard Development, L.P. | Avoiding printing defects |
DE10261221A1 (de) * | 2002-12-20 | 2004-07-15 | Océ Document Technologies GmbH | Verfahren und Vorrichtung zur Echtzeitkontrolle von Druckbildern |
DE10319771B4 (de) † | 2003-05-02 | 2005-03-17 | Koenig & Bauer Ag | System zur Inspektion eines Druckbildes |
DE10349896B4 (de) * | 2003-10-25 | 2005-11-17 | Koenig & Bauer Ag | Bogendruckmaschine und Verfahren zum Betreiben einer Bogendruckmaschine |
DE102005001091B3 (de) * | 2005-01-06 | 2006-04-06 | Lpcon Gmbh | Verfahren und Anordnung zur Fehlererkennung an Druckbildern während der Bahnbeobachtung von gedrucktem Material |
CN101077649B (zh) * | 2006-05-24 | 2011-05-04 | 海德堡印刷机械股份公司 | 用于印刷机的操作装置 |
KR101420591B1 (ko) * | 2010-11-05 | 2014-07-17 | 한국전자통신연구원 | 압인 롤러 및 핀-프레스 기반의 자동 소인 방법 및 장치 |
US20130087059A1 (en) * | 2011-10-06 | 2013-04-11 | Applied Vision Corporation | System and method for detecting decorator wheel blanket defects |
EP2748008A4 (de) * | 2011-11-02 | 2015-04-01 | Dip Tech Ltd | Verfahren und vorrichtung zur korrektur eines gedruckten bildes |
DE102014010344A1 (de) | 2014-07-11 | 2016-01-14 | Heidelberger Druckmaschinen Ag | Verfahren zur Fehlerortbestimmung auf einem Drucksubstrat |
JP6977368B2 (ja) * | 2017-07-28 | 2021-12-08 | コニカミノルタ株式会社 | 画像形成装置、検査装置およびプログラム |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983000557A1 (en) * | 1981-07-29 | 1983-02-17 | Horiguchi, Satoru | Method and device for inspecting printed matter |
GB8415996D0 (en) * | 1984-06-22 | 1984-07-25 | Bank Of England | Image model |
DE3829341A1 (de) * | 1988-08-30 | 1990-03-08 | Roland Man Druckmasch | Datenerfassung fuer farbregelanlagen |
DE4004056A1 (de) * | 1990-02-10 | 1991-08-14 | Roland Man Druckmasch | Verfahren und vorrichtung zur farbsteuerung und zonenweisen voreinstellung |
CA2058242C (en) * | 1990-12-20 | 1996-12-17 | Yutaka Hashimoto | Print monitoring apparatus |
DE4142481A1 (de) * | 1991-08-12 | 1993-02-18 | Koenig & Bauer Ag | Qualitaetskontrolle einer bildvorlage z. b. eines gedruckten musters |
WO1995000337A1 (en) * | 1993-06-17 | 1995-01-05 | The Analytic Sciences Corporation | Automated system for print quality control |
DE4321177A1 (de) | 1993-06-25 | 1995-01-05 | Heidelberger Druckmasch Ag | Vorrichtung zur parallelen Bildinspektion und Farbregelung an einem Druckprodukt |
DE4321179A1 (de) * | 1993-06-25 | 1995-01-05 | Heidelberger Druckmasch Ag | Verfahren und Einrichtung zur Steuerung oder Regelung von Betriebsvorgängen einer drucktechnischen Maschine |
-
1995
- 1995-05-04 DE DE19516352A patent/DE19516352A1/de not_active Ceased
-
1996
- 1996-04-01 EP EP96105188A patent/EP0741027B1/de not_active Expired - Lifetime
- 1996-04-01 DE DE59605570T patent/DE59605570D1/de not_active Expired - Lifetime
- 1996-05-06 US US08/643,597 patent/US6449385B1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10218068B4 (de) * | 2001-05-23 | 2017-07-27 | Heidelberger Druckmaschinen Ag | Verfahren zum Erstellen von Farbkalibrierungskennlinien |
Also Published As
Publication number | Publication date |
---|---|
EP0741027A2 (de) | 1996-11-06 |
DE59605570D1 (de) | 2000-08-17 |
US6449385B1 (en) | 2002-09-10 |
DE19516352A1 (de) | 1996-11-07 |
EP0741027A3 (de) | 1998-03-25 |
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