EP2444250A1 - Procédé et dispositif destinés à la compression numérique de décors - Google Patents
Procédé et dispositif destinés à la compression numérique de décors Download PDFInfo
- Publication number
- EP2444250A1 EP2444250A1 EP11005149A EP11005149A EP2444250A1 EP 2444250 A1 EP2444250 A1 EP 2444250A1 EP 11005149 A EP11005149 A EP 11005149A EP 11005149 A EP11005149 A EP 11005149A EP 2444250 A1 EP2444250 A1 EP 2444250A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pattern
- printing
- decors
- generator
- 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
Links
- 238000007639 printing Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 39
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- 238000005034 decoration Methods 0.000 abstract description 8
- 230000000007 visual effect Effects 0.000 description 12
- 239000013598 vector Substances 0.000 description 10
- 238000007641 inkjet printing Methods 0.000 description 9
- 239000002023 wood Substances 0.000 description 9
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- 238000009408 flooring Methods 0.000 description 7
- 239000000123 paper Substances 0.000 description 7
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- 238000001279 elastic incoherent neutron scattering Methods 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
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Images
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, but increasingly ink jet decor printers are used, which are also able to produce small 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 device for carrying out the method described above accordingly comprises at least one print head of a digital printer equipped with a multiplicity of color dot generators for generating the decors, a feed device for moving the surface to be printed relative to the print head, a control unit for controlling the print head with control data a stored print image, at least one sensor for detecting an erroneous function of individual color point generators, an arithmetic 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 smears which are as similar as possible to the local texture properties produced by the erroneous 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.
- this or these printed pattern shown on the display unit can be simulated the occurred printing error of the at least one color dot generator
- 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.
- control unit 52 selects that print job 41, 42, 43, 44 whose texture histogram H1 to H3 has the smallest deviation from that of the faulty print.
- 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 18, in which no longer opens a faulty nozzle for black color and thus causes a disturbing unprinted light stripe 22.
- a suitable decor 30 of the print job 44 in which this bright stripe disturbs little visually, since in this position, the pattern to be printed is patterned very small.
- This rapid re-printing means a significant increase in product value 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 uses color texture analysis techniques 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 which describes the human perception of color textures such as woodgrains by mathematical models in such a way 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 automatically running 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.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Ink Jet (AREA)
- Record Information Processing For Printing (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2444250A1 true EP2444250A1 (fr) | 2012-04-25 |
EP2444250B1 EP2444250B1 (fr) | 2017-08-09 |
Family
ID=45115494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11005149.7A Active EP2444250B1 (fr) | 2010-06-23 | 2011-06-24 | Procédé et dispositif destinés à la compression numérique de décors |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2444250B1 (fr) |
DE (1) | DE102010024785A1 (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014100858B3 (de) * | 2014-01-27 | 2015-07-09 | Akzenta Paneele + Profile Gmbh | Verfahren und Vorrichtung zur Herstellung eines direkt bedruckten Dekorpaneels unter Verminderung von Ausschuss aufgrund von Druckfehlern |
DE102014004543A1 (de) | 2014-03-31 | 2015-10-01 | Baumer Inspection Gmbh | Verfahren zur Herstellung eines dekorierten Paneels |
EP3656566A1 (fr) * | 2018-11-23 | 2020-05-27 | Karl Pedross AG | Procédé d'impression de baguettes profilées allongées et baguettes profilées |
CN112078264A (zh) * | 2019-06-14 | 2020-12-15 | 海德堡印刷机械股份公司 | 用于均衡喷墨印刷缺陷的采用补偿印刷图像的印刷方法 |
CN111148633B (zh) * | 2017-10-02 | 2022-02-18 | 爱克发有限公司 | 制造装饰表面的方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3656571B1 (fr) | 2018-11-20 | 2021-08-04 | Flooring Industries Limited, SARL | Papier décoratif ou film |
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 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050078133A1 (en) * | 2003-10-10 | 2005-04-14 | Pep-Lluis Molinet | Compensation of lateral position changes in printing |
US20050259296A1 (en) | 2004-05-06 | 2005-11-24 | Oce-Technologies B.V. | Printing method with camouflage of defective print elements |
US20070070111A1 (en) | 2005-09-28 | 2007-03-29 | Samsung Electronics Co., Ltd. | Inkjet image forming apparatus and method of compensating for defective nozzle thereof |
US20070195351A1 (en) * | 2006-02-21 | 2007-08-23 | Xerox Corporation | System and method for minimizing visibility of print defects |
US20090010498A1 (en) * | 2007-07-06 | 2009-01-08 | Gonzalo Gaston | Print emulation of test pattern |
US20100020121A1 (en) * | 2008-07-22 | 2010-01-28 | Xerox Corporation | Systems and methods for monitoring jets with full width array linear sensors |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1642089B1 (fr) | 2003-07-03 | 2010-09-22 | Northrop Grumman Corporation | Procede et systeme destines a augmenter la precision de mesures de navigation inertielle au moyen de gradients de gravite mesures et stockes |
DE102008048383A1 (de) | 2008-09-22 | 2010-03-25 | Baumer Inspection Gmbh | Automatisches Flicken von Holzpaneelen mit ästhetischer Rekonstruktion |
-
2010
- 2010-06-23 DE DE102010024785A patent/DE102010024785A1/de not_active Ceased
-
2011
- 2011-06-24 EP EP11005149.7A patent/EP2444250B1/fr active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050078133A1 (en) * | 2003-10-10 | 2005-04-14 | Pep-Lluis Molinet | Compensation of lateral position changes in printing |
US20050259296A1 (en) | 2004-05-06 | 2005-11-24 | Oce-Technologies B.V. | Printing method with camouflage of defective print elements |
US20070070111A1 (en) | 2005-09-28 | 2007-03-29 | Samsung Electronics Co., Ltd. | Inkjet image forming apparatus and method of compensating for defective nozzle thereof |
US20070195351A1 (en) * | 2006-02-21 | 2007-08-23 | Xerox Corporation | System and method for minimizing visibility of print defects |
US20090010498A1 (en) * | 2007-07-06 | 2009-01-08 | Gonzalo Gaston | Print emulation of test pattern |
US20100020121A1 (en) * | 2008-07-22 | 2010-01-28 | Xerox Corporation | Systems and methods for monitoring jets with full width array linear sensors |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014100858B3 (de) * | 2014-01-27 | 2015-07-09 | Akzenta Paneele + Profile Gmbh | Verfahren und Vorrichtung zur Herstellung eines direkt bedruckten Dekorpaneels unter Verminderung von Ausschuss aufgrund von Druckfehlern |
EP3099510B1 (fr) | 2014-01-27 | 2017-07-05 | Akzenta Paneele + Profile GmbH | Procédé et dispositif pour la production d'un panneau décoratif directement imprimé, permettant de réduire les rebuts résultant de défauts d'impression |
DE102014004543A1 (de) | 2014-03-31 | 2015-10-01 | Baumer Inspection Gmbh | Verfahren zur Herstellung eines dekorierten Paneels |
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 |
EP3656566A1 (fr) * | 2018-11-23 | 2020-05-27 | Karl Pedross AG | Procédé d'impression de baguettes profilées allongées et baguettes profilées |
CN112078264A (zh) * | 2019-06-14 | 2020-12-15 | 海德堡印刷机械股份公司 | 用于均衡喷墨印刷缺陷的采用补偿印刷图像的印刷方法 |
Also Published As
Publication number | Publication date |
---|---|
EP2444250B1 (fr) | 2017-08-09 |
DE102010024785A1 (de) | 2011-12-29 |
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