WO2009112240A2 - Procédé d'application d'une image comportant des informations supplémentaires intégrées sur un support de données - Google Patents

Procédé d'application d'une image comportant des informations supplémentaires intégrées sur un support de données Download PDF

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Publication number
WO2009112240A2
WO2009112240A2 PCT/EP2009/001710 EP2009001710W WO2009112240A2 WO 2009112240 A2 WO2009112240 A2 WO 2009112240A2 EP 2009001710 W EP2009001710 W EP 2009001710W WO 2009112240 A2 WO2009112240 A2 WO 2009112240A2
Authority
WO
WIPO (PCT)
Prior art keywords
image
pixels
gray
additional information
brightness values
Prior art date
Application number
PCT/EP2009/001710
Other languages
German (de)
English (en)
Other versions
WO2009112240A3 (fr
Inventor
Thomas Kramer
Original Assignee
Maurer Electronics Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maurer Electronics Gmbh filed Critical Maurer Electronics Gmbh
Publication of WO2009112240A2 publication Critical patent/WO2009112240A2/fr
Publication of WO2009112240A3 publication Critical patent/WO2009112240A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/337—Guilloche patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • B42D2035/26—

Definitions

  • the present invention relates to a method for applying an image by means of an output device to a data carrier, in particular to a data or ID card.
  • the data carrier material is deliberately blackened by a laser beam modulated in its intensity in such a way that the desired image information, eg. a portrait photo of the cardholder as well as a name reflecting his name.
  • the image information in particular the portrait photo, is present in digital form as a pixel matrix.
  • the number of stored pixels depends on the desired size of the image on the disk and the resolution of serving as an output device laser marking system.
  • microtext as a phase-modulated line raster over a background, whereby various images can be visualized by means of a special associated line raster (see above, page 157f.).
  • micro-font images in which all the pixels of the background have the same gray level or the same color value. Accordingly, the characters used for the individual pixels also have the same gray level or color among each other. The image is then generated by the arrangement of different characters with different filling factor, ie with different coverage of the respective associated pixel area. In this case, the text is not selectable. Conversely, if a given text is used, the gray levels or color values of the individual characters must be varied, but this leads to poor image quality.
  • the present invention seeks to provide a further method for applying an image by means of an output device to a disk in which a novel security feature is provided to further increase the counterfeit security of the data carrier, which is invisible to the unaided human eye with simple optical means can be visualized.
  • additional or microinformation is embedded in an image to be applied to the data carrier, which consists of a plurality of pixels corresponding to the Resolution of the output consists of positive and negative gray or brightness values.
  • the gray or brightness values of the pixels of the additional information are superimposed on the gray or brightness values of the pixels of the actual image, wherein the number of pixels of the image to be applied has possibly been previously adapted to the spatial resolution of the output device.
  • the image to be applied is then recorded together with the additional or microinformation embedded in this way in accordance with the gray or brightness values of the picture elements pixel by pixel on the data carrier.
  • both positive and negative values are required for embedding the additional or microinformation to increase the gray or brightness values of some pixels and, in turn, the gray or brightness values other pixels to decrease so that the un-armed human eyes provide gray or brightness impression of the image with additional or microinformation does not change from that of the original image.
  • the embedding of the additional or microinformation can also be effected by a variation of the color values of the individual pixels, that is, by changes in the color or the color saturation.
  • the changes in chroma or color saturation of the individual pixels should be selected so that the change in chroma or chroma in some pixels is compensated for by an opposite change in chroma or chroma in other pixels so as not to alter the overall impression of the image.
  • additional or microinformation ie image information that is not visible to the naked eye, can be embedded in an image, for example in a portrait photo or in any other image, that the actual image, when viewed with the naked eye will appear exactly as it would appear if it had been applied to the data carrier without the additional information.
  • the invention thus uses the high spatial frequencies of the image, which are in the range of the spatial resolution of the output device and above the resolution ability of the human eye to embed additional information into the image such that the low spatial frequencies corresponding to the resolving power of the human eye are not affected thereby. Due to the integrating perception of the human eye for structures that are smaller than its resolution, the additional information is invisible, but can be made visible by a simple magnification with a magnifying glass or the like.
  • the method according to the invention can be carried out with any output device for applying an image to a data carrier whose resolution is higher than that of the human eye, which can thus produce such fine pixels so close together that they are no longer perceived separately by the human eye can.
  • the integral of the gray or brightness values or color values over all pixels of each region of pixels of the additional information corresponds to zero.
  • the additional information to be embedded is embedded in regions of the image to be applied which have average gray or brightness values or color values.
  • the additional information can be integrated into the actual image in a particularly inconspicuous manner, and yet is easily recognizable by simple enlargement with the aid of a simple magnifying glass.
  • the additional information to be embedded is a text.
  • the name of the cardholder can be used as micro or additional information for the security feature according to the invention.
  • guilloche may also be provided as micro or additional information to be embedded.
  • net for the implementation of the method according to the invention is a laser marking system with a pixel size of less than 50 microns, preferably less than 40 microns and in particular in the range of about 20 to 30 microns.
  • FIG. 1 shows a card-shaped data carrier with a security feature according to the present invention
  • FIG. 2 shows a representation of the portrait photograph on the data carrier of FIG. 1 for illustrating the security feature integrated therein;
  • FIGS. 3a and 3b show a schematic simplified illustration of gray values of different pixels in an image with a security feature integrated therein according to the present invention
  • FIG. 4 shows the course of gray values in an image above the location; the gray values of the security feature to be embedded over the location, as well as the gray scale value over the location in an image with an embedded security feature.
  • Figure 1 shows as a data carrier a data card, which is shown for example as ID card or bank card.
  • the data card 10 has a recording surface 1 on which the name 2 of the owner and his portrait photo 3 are recorded in a personalization area.
  • general security features 4, such as tilted images or the like and the name 5 of the issuing institution can be recorded on the recording surface.
  • a security background 6 made of guilloches or the like can be provided partially or completely.
  • a security feature 7 according to the invention is integrated so that it is not noticeable to the naked eye.
  • the gray value course within the portrait photo 3 is as expected in the case of a standard passport photo or the like.
  • the image In order to be able to introduce the micro or additional information into the image, it is first necessary for the image to be present in digital form, that is to say it is subdivided into individual pixels. If the number of pixels present is smaller than the resolving power of the recording apparatus, such an image consisting of pixels can be scaled by suitable interpolation methods to the maximum spatial resolution of the output apparatus.
  • a portrait photo which is intended for a format of 3 x 4 cm, with 600 x 800 pixels, results in a resolution in the recorded image of 500 dpi.
  • a resolution of 70 dpi would already be sufficient, which would correspond to approximately 21 ⁇ 280 pixels.
  • the recorder operates at a resolution of 1000 dpi, approximately 1200 x 1600 pixels are required for the image.
  • the resolution limit of the human eye is approximately 70 dpi
  • 5 x 5 to 6 x 6 pixels are available for every pixel that can be recognized by the human eye.
  • FIG. 3 a shows three pixels Pl, P 2, P 3 with their gray values over the location. If an image is then recorded on the basis of these gray values, the result is a picture which is pleasing to the human eye.
  • a pixel is now subdivided into finer pixels Pmi. Now, each of the micro-pixels Pmi can be assigned a gray value such that the average of the gray values of the micro-pixels Pmi is equal to the original gray value of the pixel P2.
  • the procedure can be such that one of the pixels is assigned a gray value twice as large as the pixel P2, while the two adjacent micro-pixels Pmi are assigned gray values which amount to only half.
  • the smaller gray levels required to compensate for the increased gray level may also be distributed evenly or arbitrarily over a particular area.
  • FIG. 4 a schematically shows the gray value profile in an image over the location, a light-dark transition 8 being illustrated.
  • the areas P here indicate the resolution limit of the human eye, while the areas Pm represent the resolution of the recording apparatus. If an image is already recorded with a corresponding resolution, the digitally recorded image can be further processed in this form immediately. However, if the pixels of the recorded image are not sufficient, appropriate scaling must be carried out with suitable interpolation programs which prevent blocking in the recorded image.
  • the microinformation to be introduced into the image is then arranged in the form of positive and negative gray values, as shown in FIG. 4b, in such a way that each information pixel of the security feature has more than one image. corresponding to the resolution limit of the recording device corresponding micro-pixels, wherein the sum of the gray values of these pixels, which are in an area whose size corresponds approximately to the size of the visible pixels with the naked eye, is always equal to zero.
  • color images have the color values, for example the values for chromaticity and / or color saturation of individual pixels of the resolution capability of the respective output or printing device corresponding image as the gray or brightness values to vary to integrate additional information in the applied, for example, printed image without disturbing the colorful overall impression.
  • the advantage of the security feature according to the invention is that it can be generated on the one hand only with very high resolution recording devices, such as those used in Laserpersonalmaschinesanlagen, and thus is virtually impossible to fake.
  • the security feature according to the invention can be detected with any good magnifying glass, so that no special equipment is required for its recognition and testing.
  • the security feature according to the invention can be integrated not only in portrait photos on identification cards and the like, but in any image representation, for example also on bills, documents and other documents to be protected against counterfeiting.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Credit Cards Or The Like (AREA)
  • Image Processing (AREA)

Abstract

L'invention concerne un procédé d'application d'une image au moyen d'un appareil d'émission sur un support de données, notamment sur une carte de données ou d'identité. Pour augmenter la sécurité anti-falsification du support de données, des informations supplémentaires invisibles à l'oeil nu sont intégrées en tant que nouvelle caractéristique de sécurité dans une image à appliquer. A cet effet, l'image à appliquer est composée d'une pluralité de pixels auxquels sont respectivement affectés des niveaux positifs de gris ou de luminosité; le nombre de pixels de l'image est adapté à la résolution locale de l'appareil d'émission; les informations supplémentaires à intégrer dans l'image à détecter sont composées d'une pluralité de pixels, en fonction de la résolution locale de l'appareil d'émission, auxquels sont respectivement affectés des niveaux positifs de gris ou de luminosité; les niveaux de gris ou de luminosité des pixels des informations supplémentaires à intégrer sont superposés aux niveaux de gris ou de luminosité des pixels de l'image; et l'image à appliquer est reproduite pixel par pixel sur le support de données au moyen des niveaux de gris ou de luminosité ainsi obtenus.
PCT/EP2009/001710 2008-03-10 2009-03-10 Procédé d'application d'une image comportant des informations supplémentaires intégrées sur un support de données WO2009112240A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08004398.7A EP2100747B1 (fr) 2008-03-10 2008-03-10 Procédé destiné à l'application d'une image dotée d'une information supplémentaire incorporée sur un support de données
EP08004398.7 2008-03-10

Publications (2)

Publication Number Publication Date
WO2009112240A2 true WO2009112240A2 (fr) 2009-09-17
WO2009112240A3 WO2009112240A3 (fr) 2009-11-12

Family

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PCT/EP2009/001710 WO2009112240A2 (fr) 2008-03-10 2009-03-10 Procédé d'application d'une image comportant des informations supplémentaires intégrées sur un support de données

Country Status (2)

Country Link
EP (1) EP2100747B1 (fr)
WO (1) WO2009112240A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2015147283A1 (ja) * 2014-03-27 2017-04-13 凸版印刷株式会社 表示体、および、表示体の観察方法
CN106663211A (zh) * 2014-09-02 2017-05-10 联邦印刷厂有限公司 用于识别在值文档和/或安全文档上的篡改的方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013108423B4 (de) * 2013-08-05 2018-06-28 Bundesdruckerei Gmbh Verfahren zum Aufbringen eines Bildes mittels eines Lasergerätes auf einen Datenträger
DE102014211513B4 (de) * 2014-06-16 2018-11-22 Bundesdruckerei Gmbh Verfahren und Vorrichtung zur Personalisierung eines Dokumentenrohlings mit einer Grafik
DE102020000512A1 (de) 2020-01-28 2021-07-29 Mühlbauer Gmbh & Co. Kg Verfahren zur Sichtbarmachung von Sicherheitsinformationen eines digital gespeicherten Bildes und Bildwiedergabegerät zur Ausführung eines solchen Verfahrens

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3130182A1 (de) * 1981-07-30 1983-02-17 GAO Gesellschaft für Automation und Organisation mbH, 8000 München Guillochenraster
WO2003006257A1 (fr) * 2001-07-11 2003-01-23 Ecole Polytechnique Federale De Lausanne Images incorporant des microstructures
US20030038974A1 (en) * 2001-08-14 2003-02-27 Huver Hu Security document manufacturing method and apparatus using halftone dots that contain microscopic images
WO2005042268A1 (fr) * 2003-11-03 2005-05-12 Ovd Kinegram Ag Element de securite diffractant comportant une image en demi-teinte
EP1747897A1 (fr) * 2005-07-28 2007-01-31 Mühlbauer AG Procédé pour personnaliser une image sur un substrat en plastique et un document personnalisé de sécurité
EP1889732A1 (fr) * 2006-08-18 2008-02-20 Setec Oy Procédé de superposition d'images et procédé de personnalisation de documents avec de procédé

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6104812A (en) * 1998-01-12 2000-08-15 Juratrade, Limited Anti-counterfeiting method and apparatus using digital screening
EP1995075A1 (fr) * 2007-05-24 2008-11-26 Gemplus SA. Support d'information comprenant des informations d'identification imprimées et des moyens anti-falsification

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3130182A1 (de) * 1981-07-30 1983-02-17 GAO Gesellschaft für Automation und Organisation mbH, 8000 München Guillochenraster
WO2003006257A1 (fr) * 2001-07-11 2003-01-23 Ecole Polytechnique Federale De Lausanne Images incorporant des microstructures
US20030038974A1 (en) * 2001-08-14 2003-02-27 Huver Hu Security document manufacturing method and apparatus using halftone dots that contain microscopic images
WO2005042268A1 (fr) * 2003-11-03 2005-05-12 Ovd Kinegram Ag Element de securite diffractant comportant une image en demi-teinte
EP1747897A1 (fr) * 2005-07-28 2007-01-31 Mühlbauer AG Procédé pour personnaliser une image sur un substrat en plastique et un document personnalisé de sécurité
EP1889732A1 (fr) * 2006-08-18 2008-02-20 Setec Oy Procédé de superposition d'images et procédé de personnalisation de documents avec de procédé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2015147283A1 (ja) * 2014-03-27 2017-04-13 凸版印刷株式会社 表示体、および、表示体の観察方法
CN106663211A (zh) * 2014-09-02 2017-05-10 联邦印刷厂有限公司 用于识别在值文档和/或安全文档上的篡改的方法
CN106663211B (zh) * 2014-09-02 2020-10-16 联邦印刷厂有限公司 用于识别在有价文档和/或安全文档上的篡改的方法

Also Published As

Publication number Publication date
EP2100747A1 (fr) 2009-09-16
WO2009112240A3 (fr) 2009-11-12
EP2100747B1 (fr) 2015-02-25

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