EP3423280B1 - Procédé d'inspection d'une forme d'impression, en particulier d'un cylindre de rotogravure - Google Patents

Procédé d'inspection d'une forme d'impression, en particulier d'un cylindre de rotogravure Download PDF

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Publication number
EP3423280B1
EP3423280B1 EP18706632.9A EP18706632A EP3423280B1 EP 3423280 B1 EP3423280 B1 EP 3423280B1 EP 18706632 A EP18706632 A EP 18706632A EP 3423280 B1 EP3423280 B1 EP 3423280B1
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EP
European Patent Office
Prior art keywords
image
engraving
template
images
proofs
Prior art date
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Application number
EP18706632.9A
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German (de)
English (en)
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EP3423280A1 (fr
Inventor
Daniel Schmidt
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.)
Matthews International GmbH
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Matthews International GmbH
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Priority to PL18706632T priority Critical patent/PL3423280T3/pl
Publication of EP3423280A1 publication Critical patent/EP3423280A1/fr
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply
    • 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 is based on a method for checking a printing form, in particular a gravure cylinder, as it is known from EP 1 673 226 B1 and the DE 10 2008 059759 A1 is known.
  • a test print or proof is often first generated, which is compared with a corresponding template, for example, with a given to the printer sample of the print job in paper form, or with a corresponding graphics file.
  • the deviations determined between the proof and the original are subsequently categorized according to different criteria and fed to a rating entity which automatically or automatically evaluates the deviations and classifies them as printing errors attributable to a printing plate's wrong engraving.
  • the known methods have the disadvantage that the proofs used for the performed print image inspection can sometimes map errors that are not due to faulty locations in the printing form, but have a different origin. For example, it may happen that in the printing process to create the proof Farbkleckser caused by a faulty paint, or the printing medium (eg paper) has defects. Such so-called non-reproducible pseudo errors are then erroneously included in the evaluation of the printing form and accordingly lead to an incorrect result.
  • Another disadvantage of the known method is that in these a template and a pressure of the finished print are compared, in which all colors are already applied and mixed, so that an investigation of the quality of the individual ink jobs is not possible.
  • the image acquisition unit may be, for example, an optical scanner.
  • Generating at least two proofs may comprise generating a monochrome print of the printing form, respectively.
  • the color used for the monochrome proof may be any monochrome color and, in particular, does not have to be a particular color as long as it has a color in relation to the printing substrate has sufficient contrast. If the printing form is intended for printing in the CMYK color space, the printouts can be made, for example, in one of the colors cyan, magenta, yellow and black.
  • an engraving file of the printing form or a reference image of the surface of the engraved printing plate can be used as the engraving template.
  • the engraving template can serve as a template, an engraving file, which was based on the production of the printing cylinder.
  • pixels on each of the images associated with respective pixels on the template can be identified.
  • the identification of corresponding pixels between the digital images and the engraving template may include assigning those pixels to a pair of points which have the greatest degree of correspondence with each other, the pair of dots being formed from one pixel each of one of the images and one associated pixel of the original.
  • an adjustment of a brightness value of the pixel of the image and a brightness value of the image point of the engraving template can take place, after which the brightness values can be approximated and preferably matched.
  • the production of at least two proofs may comprise printing on the printing form on a substrate, in particular on paper, and if, during the checking, corresponding deviations between the digital images of the at least two proofs have been determined, the presence of a substrate defect is further excluded.
  • the image acquisition unit can create the images in digital form. Accordingly, the images may be provided as image files that are processable with popular image processing software. Accordingly, a computer-aided image processing unit can be used to determine the deviations.
  • proofs are compared with an error-free reference, also referred to as a golden template, for which according to the invention the engraving original of the printing plate is used. At least two proofs of the printing form are compared with the reference and examined for deviations therefrom.
  • optical errors that can be detected, such as dents, scratches, inclusions, splatters, gradients, misalignments, blurring, too strong, pale or missing printing or even color errors, can be considered as possible errors.
  • Color errors include false colors, color gradients and color deviations from the target pattern.
  • a proof is a proof on a newly created or manufactured for a new motif printing die.
  • the printing is done on the same substrate and with the same colors, which correspond to the final use.
  • "full" printouts In the sense of the known from the prior art method for print image inspection are used as proofs "full" printouts, in which all the colors are already applied and should already show the final motif to be generated.
  • a first step two or more proofs of the printing form to be tested are produced on a substrate, for example a roll of paper.
  • the printing form may in particular be a gravure cylinder, but is not limited to such embodiments. Since each gravure cylinder is provided for printing one color each, therefore, the proofs produced can be monochrome.
  • the proofs are imaged by means of an image recording unit, for example a commercially available optical scanner, so that the proofs in digital form, especially in a common for image processing and image analysis file format.
  • an image recording unit for example a commercially available optical scanner
  • the template 3 is a target representation of the printed image to be produced and thus has no errors. It can be a pattern of the desired print image that has been handed over to the print shop, for example, by a customer.
  • a graphic file is used as a template.
  • the template may be the engraving template underlying the engraving of the respective gravure cylinder. The advantage of this second use of the engraving template is that the effort and the cost of producing a specially prepared for the review of the printing form template can be saved. On the other hand, no transmission errors can occur which can occur during the synthesis of the template from the graphics file and its production.
  • each image position of each image 1, 2 is compared with the corresponding image position of the original 3.
  • difference values of different predetermined optical parameters are detected as deviations.
  • the difference values may optionally be calculated between each matched pair of pixels or averaged over larger pixel aggregates, the pixel aggregations meaningfully representing specific image features, respectively.
  • the optical parameters can be, in particular, the brightness, the saturation and the hue of the respective pixel or pixel cluster considered. Such deviations determined are classified as errors if the respectively calculated difference values exceed a predetermined threshold value.
  • the relevant deviation is at the same image position on all images 1, 2 and, on the other hand, the differences of the ascertained difference values between the individual images 1, 2 are within a predetermined tolerance range. If, however, it is determined during the matching check that a deviation from the original 3 is not present on both images 1, 2, this fault location is classified as a pseudo-error and possibly also not forwarded to the evaluation unit, so that this is not due to the useless processing of pseudo-errors is charged.
  • Pseudo-faults 4 can arise, for example, as a result of paper defects or ink blotches and are thus not based on fault locations in the engraving of the gravure cylinder. For testing a printing cylinder, it is therefore desirable to identify pseudo-errors 4 already in the run-up to a further and more time-consuming evaluation and to exclude them from the check.
  • the image recording unit may be advantageous to record, for example, the different images 1, 2 using different scanners or image recording units. This prevents, for example, impurities of the scanner from leading to alleged errors on all recorded images and they can go through the above-mentioned check for pseudo-errors unrecognized.
  • the recorded images 1, 2 can first be adapted to the original 3.
  • identical or at least partially identical motifs must be recognized in the images 1, 2 and the original 3 and the respectively associated image regions must be assigned to one another.
  • both the scanned print 1, 2 and the original 3 can be examined pixel by pixel for coherent image features.
  • Features are summarized according to different criteria. In general, however, the boundaries or the border of a feature run in image areas with high gradients between pixels with regard to their color or brightness values. If a deviation from the original 3 or a defect is identified by the image processing unit on the receptacle 1, 2, which consists of a plurality of adjacent pixels which are delimited from the environment by a specific feature, this deviation is also combined into a feature.
  • a comparison between template 3 and recording 1, 2 for each assignment of certain features to each other In this case, the features from the recording 1, 2 are assigned to the corresponding pixels of each corresponding feature on the reference file 3, so that pairs of dots result.
  • a so-called feature descriptor method is used. An assignment of the points to each other is based on the test, which points to each other have the highest degree of agreement.
  • the RANSAC algorithm is used to search for the best transformation to match the pairs of points.
  • RANSAC is an algorithm for estimating a model within a range of outlier and coarse error measurements, which is used for its robustness, especially in the evaluation of automatic measurements, primarily in the field of machine vision.
  • a new transformation takes place in which the difference in the brightnesses is minimized.
  • an improved, affine transformation based on the transformation determined in the previous step is searched for.
  • Further transformations compensate for distortions in the image 1, 2 of the proof and the orientation of template 3. This process is done in two steps by first performing a global transformation of the entire proof and then a local transformation in smaller parts of the proof. Subsequently, the brightness difference between the two images is minimized by adjusting the brightness of the pixels in the image 1, 2 to the original 3 based on the determined difference of the brightness values of the individual pixels of the pixel pairs. In order to adjust the brightness, the respective areas in the image 1, 2 are adjusted for respective brightness ranges of the original 3.
  • first brightness ranges are defined which comprise pixels which have similar brightnesses.
  • the brightness in the corresponding region of the image 1, 2 is then adjusted.
  • the brightness is adjusted with the aid of the standard deviation and the mean of the total number of brightness values of the area, each pixel having a brightness value. Values with excessive deviation from the average brightness are not taken into account and are not included in the calculation.
  • Such a brightness adjustment allows an adaptation of the images 1, 2 without too much manipulation of potential errors, so that they could possibly no longer be found.
  • the difference between template 3 and adapted scanned image 1, 2 is calculated.
  • the areas for which the calculation gives a large difference between the brightness values now provide possible locations for potential errors in the pressure.
  • these resulting deviations or abnormalities are only forwarded to the subsequent evaluation unit if the corresponding differences in brightness firstly lie above predetermined threshold values and secondly, the potential errors in both images 1, 2 or proofs are to be found. By doing so, pseudo faults 4 resulting from blobs or paper defects can be filtered out from the later evaluation for the low pressure cylinder control.
  • FIGS. 2 to 4 show by way of example a template 3 and two images 1, 2 of proofs, some of which have regular errors 5 and partially pseudo errors 4.
  • FIG. 2 a template or a reference file 3, which shows a graph which has four similar elements, for example, each represent a print for a beverage carton and are available at regular intervals on the template 3.
  • FIG. 3 shows a representation of an image 4 of a first proof of a printing form, which also shows the four similar elements as the original 3, but additionally has a pseudo-error 4 and two regular errors 5, which are distributed on the pressure 1 and the recording 4.
  • FIG. 4 is shown another image 5 of a further An Kunststoffs the same printing form.
  • the image 5 also has a pseudo-error 4 and two regular errors 5. It should be noted that the pseudo-error 4 is in a different position than the pseudo-error of the first pressure according to FIG. 3 and in particular with regard to its shape is different.
  • both the regular errors 5 and the respective pseudo-errors 4 are recognized without first being distinguished.
  • each of the defects 4, 5 of each image 1, 2 is compared with the template 3 then checked whether this is also present on the respective other image 1, 2.
  • the two errors 5 can thereby be classified as coinciding in terms of their expression and their position on the images 1, 2 as regular / genuine errors of the printing form.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Image Processing (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (10)

  1. Procédé de vérification d'une plaque d'impression plus particulièrement d'un cylindre d'héliogravure, afin de détecter des erreurs dans une gravure de la forme d'impression, qui comprend les étapes suivantes :
    - production d'au moins deux épreuves (1, 2) avec une plaque d'impression à vérifier,
    - prise d'au moins une image numérique (4, 5) avec une unité de prise de vue (3) des au moins deux épreuves (1, 2),
    - comparaison des images numériques (4, 5) des au moins deux épreuves (1, 2) avec un modèle de gravure (6) de la plaque d'impression, la comparaison comprenant :
    - la détermination d'écarts entre chacune des images (4, 5) et le modèle de gravure (6) et
    - le contrôle des écarts déterminés afin de déterminer des écarts coïncidant entre les images numériques (4, 5) des au moins deux épreuves (1, 2),
    moyennant quoi une pseudo-erreur est détectée lorsque, lors de la comparaison, aucun écart coïncidents entre les images numériques (4, 5) des au moins deux épreuves (1, 2) n'est constaté et moyennant quoi, lors d'écarts coïncidents, une erreur de gravure est détectée dans la plaque d'impression.
  2. Procédé selon la revendication 1, caractérisé en ce que la production d'au moins deux épreuves (1, 2) comprend la production d'une épreuve monochrome de la plaque d'impression.
  3. Procédé selon la revendication 1, caractérisé en ce que, pour la comparaison des images numériques (4, 5), en tant que modèle de gravure (6), est utilisé un fichier de gravure de la plaque d'impression ou une image de référence de la surface de la plaque d'impression gravée.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que, lors de la comparaison entre le modèle de gravure (6) et les images (4, 5), les positions d'images coïncidentes de l'image (4, 5) correspondante et du modèle de gravure (6) sont confrontées, moyennant quoi, lors de la détermination des écarts par rapport à chaque position d'image, des valeurs de différence entre le modèle de gravure (6) et l'image (4, 5) sont vérifiées en ce qui concerne des paramètres optiques prédéterminés, plus particulièrement la luminosité, la saturation et la teinte, afin de déterminer si l'intervalle de tolérance correspondant est respecté.
  5. Procédé selon la revendication 4, caractérisé en ce que des écarts coïncidents sont constatés, d'une part, lorsqu'un des écarts déterminés se trouve sur toutes les images (4, 5) au niveau de la même position d'image et d'autre part lorsque les valeurs de différences déterminées se trouvent à l'intérieur d'un intervalle de tolérance prédéterminé.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que, avant la comparaison des images numériques (4, 5) avec le modèle de gravure (6), des points sont identifiés sur chacune des images (4, 5), qui correspondent chacun à des points sur le modèle (6).
  7. Procédé selon la revendication 6, caractérisé en ce que l'identification de points correspondants entre les images numériques (4, 5) et le modèle de gravure (6) comprend l'attribution des points qui présentent le degré de coïncidence le plus important entre eux à une paire de points, la paire de points étant constituée d'un point d'une des images (4, 5), et d'un point correspondante du modèle de gravure (6).
  8. Procédé selon la revendication 7, caractérisé en ce que, pour chaque paire de points, est effectuée une comparaison d'une valeur de luminosité du point de l'image (4, 5) et d'une valeur de luminosité du point du modèle de gravure (6) et les valeurs de luminosité étant ensuite rapprochées entre elles et de préférence mise en coïncidence.
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que, pour chaque paire de points, sur un affichage optique, sont affichés, l'un à côté de l'autre ou l'un sur l'autre, le modèle de gravure (6) et l'image (4, 5) correspondante, les deux points de la paire de points étant mis en correspondance entre eux, plus particulièrement reliés entre eux par l'intermédiaire d'une ligne.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que la production d'au moins deux épreuves (1, 2) comprend l'impression avec la plaque d'impression sur un substrat, plus particulièrement du papier, moyennant quoi, lorsque, lors du contrôle, des écarts coïncidents ont été constatés entre les images numériques (4, 5) des au moins deux épreuves (1, 2), l'existence d'une erreur de substrat est en outre exclue.
EP18706632.9A 2017-03-16 2018-01-17 Procédé d'inspection d'une forme d'impression, en particulier d'un cylindre de rotogravure Active EP3423280B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18706632T PL3423280T3 (pl) 2017-03-16 2018-01-17 Sposób kontroli formy drukarskiej, zwłaszcza cylindra wklęsłodrukowego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017105704.8A DE102017105704B3 (de) 2017-03-16 2017-03-16 Verfahren zur Überprüfung einer Druckform, insbesondere eines Tiefdruckzylinders
PCT/DE2018/100031 WO2018166551A1 (fr) 2017-03-16 2018-01-17 Procédé destiné à contrôler une forme d'impression, en particulier d'un cylindre de rotogravure

Publications (2)

Publication Number Publication Date
EP3423280A1 EP3423280A1 (fr) 2019-01-09
EP3423280B1 true EP3423280B1 (fr) 2019-07-10

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EP18706632.9A Active EP3423280B1 (fr) 2017-03-16 2018-01-17 Procédé d'inspection d'une forme d'impression, en particulier d'un cylindre de rotogravure

Country Status (7)

Country Link
US (1) US11135833B2 (fr)
EP (1) EP3423280B1 (fr)
DE (1) DE102017105704B3 (fr)
ES (1) ES2747252T3 (fr)
PL (1) PL3423280T3 (fr)
RU (1) RU2691292C1 (fr)
WO (1) WO2018166551A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018110749B3 (de) 2018-05-04 2019-08-14 Matthews International GmbH Verfahren zum Überprüfen eines Druckzylinders und eine entsprechende Anordnung
CN114202498A (zh) 2020-08-26 2022-03-18 海德堡印刷机械股份公司 图像检查过滤器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1673226B1 (fr) 2003-09-12 2012-03-14 Eyec GmbH Procede et dispositif pour controler des resultats d'impression
DE102004014547B4 (de) * 2004-03-23 2010-06-10 Koenig & Bauer Aktiengesellschaft Verfahren zur frühzeitigen Erkennung einer Abweichung in von einer Druckmaschine erzeugten Druckbildern einer laufenden Produktion
DE102006050274A1 (de) 2006-10-23 2008-05-29 Hell Gravure Systems Gmbh & Co. Kg Verfahren und Vorrichtung zur Überprüfung der Qualität wenigstens eines Druckformzylinders und eine mit einer solchen Vorrichtung ausgerüstete Fertigungslinie
DE102007047086A1 (de) * 2006-10-26 2008-04-30 Heidelberger Druckmaschinen Ag Druckplattenerzeugung für Aniloxdruckmaschinen
DE102008059759B4 (de) 2008-12-01 2010-09-23 Hell Gravure Systems Gmbh & Co. Kg Verfahren zum Vorabprüfen eines mittels mehrerer Druckformen mit verschiedenen Druckfarben zu druckenden mehrfarbigen Druckerzeugnisses

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Also Published As

Publication number Publication date
PL3423280T3 (pl) 2019-10-31
RU2691292C1 (ru) 2019-06-11
US20210046751A1 (en) 2021-02-18
WO2018166551A1 (fr) 2018-09-20
US11135833B2 (en) 2021-10-05
EP3423280A1 (fr) 2019-01-09
DE102017105704B3 (de) 2018-08-02
ES2747252T3 (es) 2020-03-10

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