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 PDFInfo
- 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
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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
- B41F33/0081—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.
Description
Claims (6)
- Procédé de production d'un modèle de référence, par des moyens électroniques, destiné à être utilisé pour le contrôle automatique de la qualité d'impression d'une image sur du papier, notamment pour des papiers-valeurs, ladite image étant composée de dessins imprimés en au moins deux phases d'impression distinctes, caractérisé par les étapes suivantes :a. On prépare un groupe d'images (feuilles test) complètement imprimées par des moyens et procédés utilisés pour l'impression en série,b. On dispose lesdites images de sorte que les dessins desdites images imprimées lors d'une première phase soient en registre,c. On enregistre lesdites images et on mémorise les valeurs densitométriques de pixels constituant lesdites images,d. On associe à chaque pixel la valeur minimum relevée dans l'ensemble des images du groupe et on forme ainsi le modèle du dessin imprimé lors de ladite première phase d'impression,e. On dispose par la suite les images de sorte à mettre en registre les dessins imprimés lors d'une autre phase d'impression et on répète les étapes c. et d. et ainsi de suite pour les dessins imprimés lors des phases d'impression distinctes,f. On recombine les modèles ainsi obtenus pour former le modèle de référence de l'image à contrôler.
- Procédé selon la revendication 1, caractérisé par le fait que pour un pixel ayant la même valeur différente de zéro sur plus d'un modèle, on l'attribue en un unique modèle en mettant dans les autres modèles cette valeur à zéro.
- Procédé selon l'une des revendications 1 ou 2, caractérisé par le fait que pour tout pixel ayant des valeurs différentes non nulles sur plus d'un modèle, on lui associe sur le modèle ayant la valeur la plus élevée la valeur absolue de la différence des deux valeurs, et on met la valeur à zéro sur le modèle ayant la valeur inférieure.
- Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que lorsqu'au moins un des dessins de l'image est imprimé par une encre couvrante à la fin de l'étape e. du procédé, on recompose les modèles différents du ou des modèles imprimés avec l'encre couvrante en excluant les valeurs de pixels imprimées avec l'encre couvrante.
- Procédé selon l'une des revendications 1 à 4, caractérisé par le fait que lorsque l'image est polychromatique, le procédé est appliqué à chacun des canaux chromatiques utilisés.
- Procédé selon l'une des revendications 1 à 5, caractérisé par le fait que la mise en registre des dessins lors d'une phase d'impression du groupe des images est réalisée en mettant en registre les pixels préalablement choisis des dessins concernés.
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 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 (fr) |
EP (1) | EP0730959B1 (fr) |
JP (2) | JPH08276569A (fr) |
KR (1) | KR100362023B1 (fr) |
CN (1) | CN1074996C (fr) |
AT (1) | ATE188916T1 (fr) |
AU (1) | AU692991B2 (fr) |
CA (1) | CA2171165C (fr) |
DE (1) | DE69606206T2 (fr) |
IT (1) | IT1276010B1 (fr) |
RU (1) | RU2161792C2 (fr) |
UA (1) | UA45320C2 (fr) |
Families Citing this family (9)
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 |
US6658139B1 (en) * | 1999-11-04 | 2003-12-02 | Eastman Kodak Company | Method for assessing overall quality of digital images |
US6639999B1 (en) * | 1999-11-04 | 2003-10-28 | Eastman Kodak Company | Apparatus for assessing overall quality of hardcopy images |
EP1661025A4 (fr) * | 2003-08-11 | 2010-05-26 | Chorus Systems Inc | Systemes et procedes de creation et d'utilisation d'un modele de reference adaptatif |
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 |
EP1790473A1 (fr) | 2005-11-25 | 2007-05-30 | Kba-Giori S.A. | Méthode pour détecter l'apparition d'erreurs d'impression sur un substrat durant son traitement dans une machine d'impression |
EP1901241A1 (fr) | 2006-09-06 | 2008-03-19 | Kba-Giori S.A. | Procédé de commande de la qualité des documents imprimés en fonction de la correspondance de motifs |
AU2009251147B2 (en) * | 2009-12-23 | 2012-09-06 | Canon Kabushiki Kaisha | Dynamic printer modelling for output checking |
Family Cites Families (6)
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 |
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 |
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 |
DE59208384D1 (de) * | 1991-08-12 | 1997-05-28 | Koenig & Bauer Ag | Qualitätskontrolle einer Bildvorlage z. B. eines gedruckten Musters |
-
1995
- 1995-03-07 IT IT95MI000430A patent/IT1276010B1/it active IP Right Grant
-
1996
- 1996-03-04 AU AU45852/96A patent/AU692991B2/en not_active Ceased
- 1996-03-04 EP EP96810121A patent/EP0730959B1/fr not_active Expired - Lifetime
- 1996-03-04 DE DE69606206T patent/DE69606206T2/de not_active Expired - Lifetime
- 1996-03-04 US US08/610,390 patent/US5778088A/en not_active Expired - Lifetime
- 1996-03-04 AT AT96810121T patent/ATE188916T1/de active
- 1996-03-04 UA UA96030834A patent/UA45320C2/uk unknown
- 1996-03-06 CA CA002171165A patent/CA2171165C/fr not_active Expired - Fee Related
- 1996-03-06 CN CN96102198A patent/CN1074996C/zh not_active Expired - Fee Related
- 1996-03-06 RU RU96104359/28A patent/RU2161792C2/ru not_active IP Right Cessation
- 1996-03-07 JP JP8050093A patent/JPH08276569A/ja not_active Withdrawn
- 1996-03-07 KR KR1019960005989A patent/KR100362023B1/ko not_active IP Right Cessation
-
2007
- 2007-03-15 JP JP2007066993A patent/JP2007168449A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
ITMI950430A0 (it) | 1995-03-07 |
KR960033772A (ko) | 1996-10-22 |
CA2171165C (fr) | 2007-04-17 |
AU4585296A (en) | 1996-09-19 |
IT1276010B1 (it) | 1997-10-24 |
ATE188916T1 (de) | 2000-02-15 |
CN1138692A (zh) | 1996-12-25 |
DE69606206T2 (de) | 2000-08-10 |
CA2171165A1 (fr) | 1996-09-08 |
JPH08276569A (ja) | 1996-10-22 |
KR100362023B1 (ko) | 2003-05-09 |
AU692991B2 (en) | 1998-06-18 |
EP0730959A1 (fr) | 1996-09-11 |
CN1074996C (zh) | 2001-11-21 |
JP2007168449A (ja) | 2007-07-05 |
ITMI950430A1 (it) | 1996-09-07 |
DE69606206D1 (de) | 2000-02-24 |
RU2161792C2 (ru) | 2001-01-10 |
US5778088A (en) | 1998-07-07 |
UA45320C2 (uk) | 2002-04-15 |
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