EP2444250B1 - Procédé et dispositif destinés à la compression numérique de décors - Google Patents

Procédé et dispositif destinés à la compression numérique de décors Download PDF

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Publication number
EP2444250B1
EP2444250B1 EP11005149.7A EP11005149A EP2444250B1 EP 2444250 B1 EP2444250 B1 EP 2444250B1 EP 11005149 A EP11005149 A EP 11005149A EP 2444250 B1 EP2444250 B1 EP 2444250B1
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EP
European Patent Office
Prior art keywords
print
color point
decors
defective
pattern
Prior art date
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Application number
EP11005149.7A
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German (de)
English (en)
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EP2444250A1 (fr
Inventor
Robert Prof. Massen
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.)
Baumer Inspection GmbH
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Baumer Inspection GmbH
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Publication of EP2444250A1 publication Critical patent/EP2444250A1/fr
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Classifications

    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2142—Detection of malfunctioning nozzles
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
    • 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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F9/00—Designs imitating natural patterns
    • B44F9/02—Designs imitating natural patterns wood grain effects

Definitions

  • the invention relates generally to the technical field of digital printing.
  • the invention relates to a method and a device for the production of decors on a surface to be printed by means of digital printing.
  • thermoplastic decorative films or directly printed panels In order to serve the market of small series of decorative papers, thermoplastic decorative films or directly printed panels, however, increasingly ink jet decor printers are used, which are also able to produce smallest quantities up to the lot size EINS.
  • the decor designer strives to aesthetically decorate the décor (eg, a wood grain) so that the failure of a single nozzle is minimally noticeable visually. This can be partially achieved with light decors, but much less with highly contrasting decors. This approach also severely restricts the variety of possible decorations, as such a tolerant decor must ensure the suppression of the visibility of the most common ink jet printing errors (open nozzle, clogged nozzle) at any point on the decor image.
  • the inkjet decoration is often used only in low-priced goods with low quality standards, in which well visible printer errors are accepted. High-quality decors will continue to be produced using the classic decorative paper printed in gravure.
  • a printing method for camouflaging faulty printing elements in which errors occurring in printing - such as caused by failure of a nozzle - be camouflaged by means of a correction of the printed image in the vicinity of the defective pixels.
  • a gray value is taken into account for each pixel of a pixel matrix to be printed in the form of an 8-bit word, ie a natural number between 0 and 255.
  • an error determined with regard to the gray value is distributed in a camouflaging manner over an area surrounding the error region.
  • an output pixel is related to a target pixel via weighting factors.
  • Errors occurring in an output pixel are compensated in the environment such that an averaged gray level of the camouflaged, ie modified print image resembles the desired gray level of the same area of the image to be printed.
  • the object is achieved by a method and a device for producing decors on a surface to be printed by means of digital printing with the features of method claim 1 or the device claim 12.
  • the inventive idea of the present application relates to such a simple measure for increasing the productivity of digital printers, in particular for the production of decorated flat substrates.
  • This is summarized, shortened, achieved in that in the case of a printing error by failure of at least one color pixel generator (an ink droplets from pushing nozzle) of the current print job is canceled and that from the list of pending print jobs with their respective different decors the Production is performed with that print job welter in which the decor to be printed has such an appearance that the caused by the erroneous function of the color dot generator oblong strip is only slightly visible, so this new print job as opposed to the previous the required visual quality also without repair of the defective color point generator.
  • the change in the decor image consists here in an exchange with another decor image.
  • the invention provides a method for decorating surfaces with planar, multicolor patterned decors by means of digital printing, wherein the surface to be printed moves relative to at least one equipped with a plurality of color dot generators printhead of a digital printer, wherein the printhead is controlled by a control device is, which control data corresponding to a stored print pattern transmits to the print head, so that it generates a decor on the passing surface, wherein by means of at least one sensor, a faulty function of the color point generator is detected.
  • the active print job is canceled.
  • An arithmetic unit determines the printing pattern of the at least one defective color dot generator.
  • a comparison unit compares this print pattern with print patterns of the still to be produced decors. Furthermore, the control unit transmits that printing pattern to the print head which has the smallest deviation in the region of the at least one defective color dot generator, so that the error of the at least one color dot producer appears least visible to the human viewer in the decor of the surface to be printed.
  • a texture image is selected which is visually similar to that of the texture image generated by the defective color point generator (s).
  • the corresponding apparatus for carrying out the method described above accordingly comprises at least one printhead of a digital printer equipped with a plurality of color dot generators for producing the decors, a feed device for moving the surface to be printed relative to the printhead, a control unit for controlling the printhead with control data a stored print image, at least one sensor for detecting an erroneous function of a single color point generator, a computation unit for determining the print pattern of at least one erroneous color point generator, a comparison unit for comparing this print pattern with print patterns of the decors yet to be produced, wherein the control device is set up, in response to the detection of an erroneous function of at least one color dot generator, canceling the active print job and transferring the print pattern to the printhead, which is in Ber eich of the at least one faulty color point generator has the slightest deviation, so that the error of the at least one color point producer in the decor of the printed surface for the human observer appears least visible.
  • the control unit transmits only that print pattern to the print head which falls below a threshold value which results from a permissible deviation of the print pattern in the region of the at least one defective color dot generator to the print patterns of the still to be produced Decors is determined.
  • the threshold value can be set.
  • histograms of different histogram types are determined and the similarity of the image files with the texture containing the defect is determined.
  • An image file can be created for a selection from the print images still to be printed, wherein the print pattern is at least partially replaced by the image file which generates an altered local print pattern at least in the vicinity of the at least one defective color dot generator, the control device thus producing the image file selects or creates such that it has a pattern in the vicinity of the region swept by the defective color dot generator that is visually similar to a printed pattern generated by the defective color dot generator.
  • Such a change may include a crop, a new compilation of patches of the image, a scaling, a reflection, a rotation, etc.
  • the selected or created image data thereby has local texture properties which are as similar as possible to the local texture properties generated by the defective color point generators.
  • the image files available for selection are stored in a memory of the device according to the invention.
  • the image file may contain, at least in the vicinity of the pixels which are erroneously printed by the at least one defective color dot generator, such patterns which, by utilizing optical illusion effects, correct the defective printing of the at least one nozzle in shape and color human visual system does not or only very weakly recognize.
  • the image file may be selected or created to display a local print image having predominantly oblong, background low-contrast patterns with a dominant color F1 at least in the vicinity of the at least one defective color dot generator At least one color point generator permanently printing with the ink F2, the image file is selected or generated such that it displays a local print image which predominantly has elongated patterns contrasting with the background, dominating at least in the vicinity of the pixel having at least one defective color dot generator Color F2 has.
  • the print patterns of the decors still to be produced can be displayed on a display unit.
  • the occurred printing error of the at least one color dot generator can be simulated.
  • a difference of an error range descriptive feature vector between the print pattern without simulated error of the at least one color dot generator and the printed pattern with simulated error of the at least one color dot generator can be displayed numerically.
  • a digital decor printer for natural wood decors will be discussed based on ink-jet printing in which typical errors such as non-closing nozzle, non-opening nozzle, or irregular nozzle will occur, resulting in objectionable stripe-shaped defects.
  • the printing unit 41, 42, 43,44 is selected by the control unit 52, whose texture histogram H1 to H3 has the smallest deviation from those of the faulty pressure.
  • Fig.1 the example of one with a wood grain of a decor 30 in the run with a 4-color ink jet print head 10 consisting of the nozzle sticks 12,13,14 and 15 to be printed laminate plank 8 explained.
  • the decor 30 is in the subtractive color of the four primary colors cyan, magenta, yellow, black (CYMK) formed on the brightly prepared background 20 of the laminate flooring 8 in the form of smallest ejected droplets.
  • CYMK magenta, yellow, black
  • Fig. 2 shows the typical error case of a color point generator (hereinafter also referred to as nozzle 16), in which, for example, no longer closes a nozzle 16 for black color, thus creating a visually disturbing continuous dark streaks 21.
  • This error is visually so troublesome that production must be stopped immediately and the black ink nozzle 16 serviced by a cleaning process. This means a typical production stoppage of 15 to 30 minutes and a corresponding loss of productivity.
  • Fig. 3 shows the concept of the invention in its simplest form. If next to the print job 40 with a decor 30 after Fig. 2 also laminate flooring 8 with a decor 30 (see Fig. 3 ) are to print, in this decor 30 of the nozzle defect in the form of the dark strip 21 would hardly disturb visually, since he changed the local texture due to the already dense there linear line grain image only insignificantly.
  • Fig. 4 illustrates the concept of the invention in another example, the reverse error of a nozzle 16, in which no longer opens a faulty nozzle for black color and thus causes a disturbing unprinted bright strip 22.
  • This fast re-printing means a significant productivity gain compared to the known method of turning on cleaning cycles or calculating new local stealth files.
  • the sensor 50 identifies the location of the faulty nozzle 16 as well as the affected nozzle 12-12. At the same time, it provides a color image of the faulty elongated section to the control unit 52, which then uses a color texture analysis technique to mathematically describe the visual appearance of that patch.
  • the control unit 52 compares this description with the corresponding descriptions of the subsequent jobs in the queue 60 with the print jobs 41 to 44 for best match.
  • the queue 60 is usually replenished continuously by the parent production computer via a network 54.
  • a mathematical texture model As in Fig. 6 2, it is sufficient, upon detecting a defect of a nozzle 16 in the form of a dark stripe 21, to describe a narrow elongated area around this defect stripe by a perceptual texture model.
  • This is a model that describes the human perception of color textures such as woodgrains by mathematical models so that the properties important for the human visual system such as the dominant colors, dominant contour directions, occurring directional angles of the grain lines are approximated by statistical models.
  • this is done by image-wise evaluation of the image taken with the sensor 50 along an elongated area centered around the defect of the nozzle 16, such that three local histograms H1 to H3 for the brightness values p (I) occurring in this area. , the contour directions p ( ⁇ ) occurring there and the curvature radii p (r) of the wood grain lines occurring there are calculated.
  • texture descriptors describing the appearance are exemplary; the literature of color textures has a number of other mathematical models for describing natural or synthetic texture images.
  • Fig. 7 describes the last method step according to the invention for the exemplary nozzle error "black elongated strip due to no longer closing K nozzle" in a block diagram.
  • the control unit 52 After the sensor 52 has detected a nozzle error and has triggered the calculation of the feature vector M from the oblong region around the nozzle error, the control unit 52 initiates the calculation of the same feature vector M for all print jobs 41 through 44 in the print queue 60.
  • the comparison unit 56 compares the feature vector of the defective area with the n feature vectors of the decors 30 in the queue 60 and selects for further printing that print job whose feature vector is most similar, the difference must not exceed a predetermined visibility threshold. If a matching job can not be found, production must be stopped and a printhead cleaning cycle started.
  • the decision whether and with which print job from the queue in the case of a nozzle error is further printed not only the automatic process of determining the mathematically similar decoration, but at the request of the operator of the system those print pattern for further printing on a color screen higher Quality visual comparison and visual assessment presented. This allows the operator to override the automatic selection of the subsequent print job.
  • this or these follow-on print jobs represented on the monitor are simulated in the respective image file and the nozzle defect that has occurred is displayed for better assessment of the visual quality of the subsequent print job.
  • the difference between the feature vector describing the error zone and the selected follow-up print job with simulated nozzle error and the selected follow-on print job with simulated nozzle error is superimposed numerically to give the user, in addition to the visual impression, also a numerical measure of the residual deviation of the decoration in the document Environment of remaining nozzle error displayed.
  • the idea of the invention is not restricted to the printing of laminate flooring designs discussed by way of example, but relates to all substrates which are printed over large areas with pictorial decors by means of digital printing in an analogous manner.
  • ink jet printing which operate by spot coloring a substrate under electronic control, such as electrophoresis on charged toner particles or on digital printers operating on thermochromic processes.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Record Information Processing For Printing (AREA)

Claims (13)

  1. Procédé de production de décors (30) par impression numérique sur une surface à imprimer,
    - la surface à imprimer se déplaçant par rapport à au moins une tête d'impression (10) d'une presse numérique comportant une pluralité de générateurs de points de couleur (12,13,14,15),
    - la tête d'impression (10) étant pilotée par un dispositif de commande (52), lequel transmet les données d'impression à la tête d'impression (10) en fonction d'une tâche d'impression (40,41,42,43,44) mémorisée dans une file d'attente (60), les tâches d'impression (40,41,42,43,44) dans la file d'attente (60) présentant différents modèles d'impression, de sorte que la tête produise un décor (30) sur la surface (8) passant devant,
    - un mauvais fonctionnement des générateurs de points de couleur (12,13,14,15) étant identifié par au moins un détecteur (50),
    caractérisé en ce que
    - la tâche d'impression en cours (40) sera interrompue en cas de détection d'un mauvais fonctionnement d'au moins un générateur de points de couleur (12,13,14,15)
    - l'unité de commande (52) compare le fragment incorrect du modèle d'impression de la tâche d'impression en cours (40), dû au mauvais fonctionnement du générateur de points de couleur (12,13,14,15), avec les modèles d'impression des tâches d'impression suivantes (41,42,43,44) se trouvant dans la file d'attente (60) et
    - transmet à la tête d'impression (10) le modèle d'impression des tâches d'impression suivantes (41,42,43,44) dans la file d'attente (60) qui présente le plus faible écart dans la zone d'au moins un générateur de point de couleur défectueux (12,13,14,15), de sorte que l'erreur d'au moins un générateur de point de couleur (12,13,14,15) soit la moins visible pour l'oeil humain dans le décor (30) de la surface à imprimer (8).
  2. Procédé de production de décors (30) selon la revendication 1, caractérisé en ce que les tâches d'impression suivantes (41,42,43,44) sont rechargées en continu dans la file d'attente (60) via un réseau (54).
  3. Procédé de production de décors (30) selon l'une des revendications précédentes, caractérisé en ce que, pour déterminer un écart, en particulier pour un calcul de l'étendue de la visibilité de l'erreur du modèle d'impression, il faut déterminer au moins un, mais de préférence tous les types d'histogrammes suivants :
    - l'histogramme H1 des valeurs de gris survenant p(I),
    - l'histogramme H2 des sens des contours p(α),
    - l'histogramme H3 des rayons de courbure p(r) des veinures.
  4. Procédé de production de décors (30) selon la revendication précédente, caractérisé en ce que l'unité de commande (52) ne transmet à la tête d'impression (10) que le modèle d'impression des tâches d'impression suivantes (41,42,43,44) dans la file d'attente (60) dont l'histogramme de texture (H1 ,H2,H3) présente le plus petit écart par rapport à l'histogramme de texture du modèle d'impression de la tâche d'impression en cours (40).
  5. Procédé de production de décors (30) selon l'une des revendications précédentes, caractérisé en ce que l'unité de commande (52) ne transmet à la tête d'impression (10) que le modèle d'impression des tâches d'impression suivantes (41,42,43,44) dans la file d'attente (60) qui descend en dessous d'une valeur seuil déterminée à partir d'un écart admissible du modèle d'impression dans la zone d'au moins un générateur de point de couleur défectueux (12,13,14,15) par rapport aux modèles d'impression des décors encore à produire.
  6. Procédé de production de décors (30) selon la revendication précédente, caractérisé en ce que la valeur seuil est réglable.
  7. Procédé de production de décors (30) selon l'une des revendications précédentes, caractérisé en ce que le modèle d'impression est remplacé au moins partiellement par un fichier image, lequel génère un modèle d'impression local modifié, au moins dans les environs d'au moins un générateur de point de couleur défectueux (12,13,14,15), l'unité de commande (52) sélectionnant ou créant le fichier image de sorte que celui-ci présente, dans les environs de la zone balayée par le générateur de point de couleur défectueux (12,13,14,15), un dessin qui soit semblable visuellement à l'un du générateur de point de couleur défectueux (12,13,14,15).
  8. Procédé de production de décors (30) selon la revendication 7, caractérisé en ce que, avec une couleur d'impression F1, le fichier image pourra être sélectionné ou créé de sorte qu'il montre une image d'impression locale qui présente, tout du moins dans les environs d'au moins un générateur de point de couleur défectueux (12,13,14,15), principalement des dessins oblongs avec une couleur dominante F1 de faible contraste avec l'arrière-plan ou que, en présence d'au moins un générateur de point de couleur (12,13,14,15) imprimant en permanence avec la couleur d'impression F2, le fichier image pourra être sélectionné ou créé de sorte qu'il montre une image d'impression locale qui présente, tout du moins dans les environs d'au moins un générateur de point de couleur défectueux (12,13,14,15), des pixels correspondants, principalement des dessins oblongs avec une couleur dominante F2 de faible contraste avec l'arrière-plan.
  9. Procédé de production de décors (30) selon l'une des revendications précédentes, caractérisé en ce que, en cas de mauvais fonctionnement d'au moins un générateur de point de couleur (12,13,14,15), les modèles d'impression des décors encore à produire sont représentés sur une unité d'affichage
  10. Procédé de production de décors (30) selon la revendication 9, caractérisé en ce que, dans le modèle d'impression respectif, le ou les modèle(s) d'impression représenté(s) sur l'unité d'affichage simulent le défaut d'impression survenu d'au moins un générateur de point de couleur.
  11. Procédé de production de décors selon la revendication 10, caractérisé en ce que la différence d'un vecteur de caractéristique décrivant une zone d'erreur, qui résulte du modèle d'impression respectif, entre le modèle d'impression sans défaut simulé d'au moins un générateur de point de couleur et le modèle d'impression avec défaut simulé d'au moins un générateur de point de couleur, est affichée sous forme numérique.
  12. Équipement de production de décors (30) par impression numérique sur une surface à imprimer, avec
    au moins une tête d'impression (10) d'une presse numérique comportant une pluralité de générateurs de points de couleur (12,13,14,15) pour la production des décors (30), un dispositif d'avance pour déplacer la surface à imprimer par rapport à la tête d'impression (10),
    une unité de commande (52) pilotant la tête d'impression (10) avec les données de commandes correspondant à l'une des tâches d'impression (40,41,42,43,44) mémorisées dans une file d'attente (60), ces tâches d'impression (40,41,42,43,44) mémorisées dans une file d'attente (60) présentant des modèle d'impression différents,
    au moins un détecteur (50) pour la saisie d'un mauvais fonctionnement de générateurs de points de couleur (12,13,14,15) isolés,
    caractérisé en ce que
    l'unité de commande (52) est réglée de manière à interrompre la tâche d'impression en cours (40) en cas de détection d'un mauvais fonctionnement d'au moins un générateur de point de couleur (12,13,14,15), de transmettre à la tête d'impression (10) le fragment incorrect du modèle d'impression de la tâche d'impression en cours (40), dû au mauvais fonctionnement du générateur de points de couleur (12,13,14,15), avec le modèle d'impression des tâches d'impression suivantes (41,42,43,44) se trouvant dans la file d'attente (60), lequel présente le plus faible écart dans la zone d'au moins un générateur de point de couleur défectueux (12,13,14,15), de sorte que l'erreur d'au moins un générateur de point de couleur dans le décor (30) de la surface imprimée (8) soit la moins visible pour l'oeil humain.
  13. Équipement selon la revendication précédente, comprenant par ailleurs un réseau (54), lequel est installé pour assurer le rechargement en continu des tâches d'impression suivantes (41,42,43,44) dans la file d'attente (60).
EP11005149.7A 2010-06-23 2011-06-24 Procédé et dispositif destinés à la compression numérique de décors Active EP2444250B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010024785A DE102010024785A1 (de) 2010-06-23 2010-06-23 Verfahren und Vorrichtung zum Digitaldruck von Dekoren

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EP2444250A1 EP2444250A1 (fr) 2012-04-25
EP2444250B1 true EP2444250B1 (fr) 2017-08-09

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DE102014004543B4 (de) 2014-03-31 2017-09-28 Robert Massen Verfahren zur Herstellung eines dekorierten Paneels
CN111148633B (zh) * 2017-10-02 2022-02-18 爱克发有限公司 制造装饰表面的方法
ES2894300T3 (es) 2018-11-20 2022-02-14 Flooring Ind Ltd Sarl Papel o película de decoración
AT521998B1 (de) * 2018-11-23 2021-12-15 Karl Pedross Ag Verfahren zum Bedrucken von länglichen Profilleisten und Profilleisten
DE102020113484A1 (de) * 2019-06-14 2020-12-17 Heidelberger Druckmaschinen Aktiengesellschaft Druckverfahren mit Kompensationsdruckbildern zum Ausgleichen von Mängeln beim Inkjetdruck
DE102021113681A1 (de) 2021-05-27 2022-12-01 Homag Gmbh Vorrichtung und Verfahren zum Veredeln eines Werkstücks
CN114425918B (zh) * 2022-01-20 2023-03-24 广东邦固薄膜涂料创新研究院有限公司 表层可自修复的皮革转移膜及其制备方法和使用方法

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