EP1147495B1 - Substrat zum drucken - Google Patents

Substrat zum drucken Download PDF

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Publication number
EP1147495B1
EP1147495B1 EP00900703A EP00900703A EP1147495B1 EP 1147495 B1 EP1147495 B1 EP 1147495B1 EP 00900703 A EP00900703 A EP 00900703A EP 00900703 A EP00900703 A EP 00900703A EP 1147495 B1 EP1147495 B1 EP 1147495B1
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EP
European Patent Office
Prior art keywords
substrate
features
substrate according
pattern
image data
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.)
Revoked
Application number
EP00900703A
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English (en)
French (fr)
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EP1147495A1 (de
Inventor
Robert John Furley
Robert George Stone
Paul Van Braeckel
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Governor and Co of Bank of England
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Governor and Co of Bank of England
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Application filed by Governor and Co of Bank of England filed Critical Governor and Co of Bank of England
Publication of EP1147495A1 publication Critical patent/EP1147495A1/de
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    • 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
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/10—Watermarks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/005—Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/206—Matching template patterns

Definitions

  • This invention concerns substrates, primarily papers and in particular to a method of modifying the substrate to make it suitable for use in printing security documents.
  • Methods are known for modifying substrates so that genuine substrates can be identified and distinguished from counterfeit substrates.
  • these methods include marking the genuine substrate with materials which fluoresce under ultra-violet, or which only emit light at some special region of the visible spectrum, or involve the addition of special material such as magnetic materials or infra-red absorbing pigments, or the inclusion of large scale water marking in pictorial or bar code form on or in the substrate. All these methods require either a gross alteration of the substrate (as in watermarking methods) or the inclusion of special materials usually requiring special detectors to determine if the substrate of any document is genuine.
  • EP No. 0882599 describes a substrate printed with a pattern which can be seen as a single printing but when copied is revealed to the eye as two printings by the copier reproduction system.
  • the features will not normally be reproduced by a copier or printer supplied with image data signals obtained from an unprotected such system, as it can be arranged that if the computer system or copier detects the said features it can therefore refuse to process the image.
  • a substrate on which a security document is to be printed includes a plurality of physical features in the surface thereof which when illuminated and imaged produce image data signals in the output of a photoelectric device characterised in that :
  • the features may be repeated at regular intervals.
  • Each of the physical features may be similar in character to each of the other features in the said surface.
  • Documents of the same type may be printed on substrate bearing similar features having a similar fixed relationship over the surface of the substrate.
  • bank notes of one denomination may be printed on a substrate having surface features of a particular type and one or more particular spacings.
  • the spacing may be selected so as to be constant in one direction only or varied according to a special, known pattern.
  • a similar or different regular spacing may be selected for features in another direction bearing a particular spacial relationship relative to the first said direction, for example perpendicular to the said first direction.
  • the features are arranged in a 2D matrix in the substrate surface.
  • Secondary encoding of a substrate may be achieved by introducing a variation into the matrix such as by omitting features from particular positions in such a regular matrix.
  • every fourth feature along each third line may be omitted.
  • security documents are encoded using both primary and secondary encodings.
  • secondary encoding may be provided if the matrix is formed from features having two distinctive characteristic and, instead of omitting features at specific positions within the matrix, features of one type are located at one set of positions in the matrix, and features of the other type are located at other positions in the matrix.
  • one set of features may be generally circular in shape, whereas interspersed features producing a secondary encoding may have a different readily distinguishable shape such as rectangular or triangular.
  • the encoding of a substrate can be achieved by selecting the spacing between features or selecting features having a specific characteristic such as shape which can be identified in image data signals relating thereto, and/or by the substitution of features having a first characteristic at selected points in a regularly occurring matrix of such features by other features having a second different characteristic, and/or the omission of features at particular points in a matrix, there is an almost infinite number of possible combinations and permutations available to encode security document substrates.
  • each individual type of security document such as banknotes of different denominations, cheques originating from different banks, passports issued by different offices, and the like, if desired can be uniquely identified by a particular primary and/or secondary encoding selected for the substrate on which they are to be printed.
  • Image analysis techniques for identifying the presence of regularly occurring patterns and/or drop-outs within regularly occurring patterns and/or shape(s) or other visibly distinguishable features of detectable features in an image, are readily available and known, and by using high speed processors such as DSPs and the like, image data can be checked and verified or otherwise, virtually instantaneously as documents are scanned.
  • a physical feature is selected for encoding the surface of a substrate to provide a primary encoding, which will not appear in the electrostatic image of a photocopier. This ensures that attempts to reproduce the original by photocopying will merely produce a copy containing the printed content of the document unless the substrate onto which it is copied contains the correct physical encoding in the surface thereof.
  • any variation in the primary encoding which constitutes the secondary encoding is even less capable of being distinguished by the naked eye or picked up by a photosensitive device as used in a photocopier.
  • the physical feature encoding is in the form of a repeat pattern.
  • the identification features are such that the appearance of the security document (for example a bank note) is not affected or disturbed aesthetically, since in the case of banknotes, the introduction of new notes provided on substrate according to the invention is permissable alongside existing banknotes printed on unencoded substrate, since if the general appearance of the documents is unchanged to the naked eye, old but nevertheless authentic notes which do not contain the physical feature encoding on the substrate surface provided by the invention, will appear similar to banknotes printed on encoded substrate.
  • the security document for example a bank note
  • Examples of physical feature encoding of a substrate as aforesaid comprise, embossing with inkless intaglio or embossing the surface by calendaring during manufacture of the substrate.
  • Two or more different encoding techniques may be combined in any substrate.
  • the invention also lies in impressing in the surface of a substrate onto which a security document is to be printed indentations and/or grooves in accordance with a first pattern which contains encoded therein a second pattern, to enable a security document printed on such a substrate to be identified by subjecting image data signals obtained from scanning the document to an appropriate mathematical algorithm to determine whether the second pattern can be found in image data signals relating to the first pattern.
  • a pattern may be encoded to produce multiple iterations of a code on the substrate.
  • the encoded pattern may not extend over the whole of the surface of the substrate forming each document but only over selected areas which align with particular printed areas of the substrate, and according to another aspect of the invention, the printed areas are selected so as to enhance the detection of the substrate surface variation during scanning and conversion of the image into image data signals.
  • Redundancy created by multiple iterations can be used to advantage since the large number of similar iterations enhances the detectability of the code by increasing the effective signal to noise ratio. This in combination with the selection of particular regions of the printed areas of the final document in which to locate the iterations, facilitates the detection by a data processor of the presence of an otherwise substantially invisible pattern in the data signals derived from the scanning.
  • the encoding of the documents must be capable of being read for example by optically scanning the documents and generating image data signals which can be handled by a computer, or by using a specialist imaging and image analysing apparatus performing this function.
  • the invention also lies in a security document substrate adapted to be identifiable as such by having detectable surface features therein features to enable identification as aforesaid.
  • the invention also lies in a security document when printed on a substrate as aforesaid.
  • a primary application of the invention lies in treating the surface of a substrate as aforesaid for use in the production of security documents so as to inhibit or degrade the reproduction of such security documents using a scanning process which converts the image into image data signals for controlling a printing process, in which a second control is introduced if surface encoding is detected by subjecting the image data signals to an appropriate algorithm, which second control serves to downgrade or inhibit the printing process so as to prevent the reproduction of the original document, or of a good quality reproduction thereof.
  • the invention also provides a method of verification, of a security document when printed on a substrate as aforesaid wherein in a first step of verification a scanning process is employed to convert the image of the surface of the substrate of the document into image data signals for controlling a printing process, and when surface encoding is detected, a second step of verification is introduced by subjecting the image data signals to an appropriate algorithm, said second step of verification, if failing, serving to downgrade or inhibit the printing process so as to prevent reproduction of the document, or at least a good quality reproduction thereof.
  • bank note authentication devices can be provided at relatively low cost to be associated with tills in shops, banks and post offices, so that at transaction points bank notes tendered by the public can be verified before they are accepted.
  • the surface treatment of a substrate in accordance with the invention includes any technique which results in lighter and darker regions to be visible in the surface of a treated sheet of substrate when illuminated for scanning.
  • Either or both primary and secondary encodings may be in the form of repeat pattern which are distinguishable under appropriate illumination to provide detectable content in digital signals obtained by scanning.
  • the substrate may be embossed during its manufacture.
  • the substrate is customary in paper or sheet plastics manufacture to make the material smooth enough for printing by passing it through a high pressure nip between two steel rollers, a process known as calendaring.
  • calendaring By forming one or both of these rollers with indentations, a paper or plastics substrate forced therebetween, will be formed with an embossing pattern corresponding to the indentations.
  • the substrate will be encoded as required by the invention, and can be detected by suitable illumination and converted into digital data signals by a scanner for analysis by a data processor.
  • an encoded structure can be formed in the surface such that the actual surface of the substrate is sufficiently smooth to accept printing ink to enable a security document to be printed thereon, but at the same time contains a fine pattern of less smooth regions, which may be less receptive of printing ink.
  • the surface may also be modified by a technique in which selected regions of a substrate describe a repeat pattern by being impregnated with a fluid such as a resin, or lacquer, such that the optical absorbtion or reflectance characteristics or optical density of the substrate is altered sufficiently as between impregnated and non-impregnated areas as to be discernable under incident light as during scanning for digitising.
  • a fluid such as a resin, or lacquer
  • the surface of the substrate can be etched by a laser beam, so as to produce cavities or grooves in the surface to be printed (or awaiting printing). This technique lends itself to the production of very fine patterns in the surface of the substrate and since a laser beam can be modulated very accurately can be used to introduce depth modulation in any such grooves or cavities as well as or instead of edge or thickness of spacing modulation.
  • Watermarks alter the thickness and/or texture of a substrate, which variations and/or can be rendered visible under incident light and can be used to form primary and/or secondary encoding of the invention. They may be formed in two ways.
  • the wet paper is embossed using an embossing roller as it is being formed, thereby impacting a mark in the paper corresponding to the embossing.
  • the embossing in a suitable repeat pattern which extends over the area of the web, so the paper can be encoded with the watermark pattern.
  • a second technique for forming a watermark uses the so-called cylinder-mould method.
  • the watermark is formed by a cylindrical wire mesh on which is impressed "mouldings" in the form of images.
  • fibres build up to a greater or lesser extent on the mesh moundings and where the thickness of the paper is greater, this gives a darker effect when viewed in transmission than do regions which are thinner and therefore which appear lighter when viewed in transmission.
  • either types of watermark is just visible in incident light this can be used to provide the background coding required by the invention.
  • either watermarking technique may be employed to apply a pattern in the surface of a substrate especially a paper substrate. which is virtually imperceptible to the naked eye, but which will appear as a low contrast pattern when subjected to incident light as where a document is arranged for scanning and digitising.
  • the techniques so far described provide a surface encoded substrate which subsequently can be printed to form a security document.
  • some of the encoding techniques, eg embossing, may be applied after some or all of the printing of the document has occurred.
  • embossing may be applied after a title, or other text, or personal data for example in the case of an ID document has been printed onto a plain substrate, and a surface encoding formed as a post-printing step.
  • Encoding by embossing can be achieved whilst printing at least some regions of a document.
  • the surface encoding may be imparted to the document by so-called "blind" intaglio printing, or intaglio printing with colourless ink.
  • an image is printed using a plate containing engraved areas, some of which are filled with ink and some of which are left empty in the case of blind intaglio printing.
  • the engraved plate inked as appropriate, is pressed under high pressure against the substrate so as to cause the ink to transfer to the substrate.
  • the substrate can become embossed with the engraved image, under the pressure applied, with parts of the substrate surface being printed, and others merely embossed.
  • the resulting substrate is shown in Figure 1, except that in practice the identification features, in this case a repetitive barcode pattern, would be invisible to the naked eye.
  • banknote is conventionally printed over the substrate and the result is shown in Figure 2.
  • the banknote design may be printed either before or after the identification features physically formed in this case by embossing ( Figure 3).
  • the encoded document when scanned into a computer is converted to a digital format.
  • This typically means that the image is analysed into red, green and blue channels for each picture element or pixel.
  • the colour of the picture element is assigned a value in each of these channels on a scale from 0 to 255 (8 bits) typically such that a full intensity is assigned to the value 255 and 'no colour' the value 0.
  • bright white will be represented by all three channels having the value 255 and black by a zero intensity having the value 0.
  • pixels relating to the embossed encoding will be affected by the shadowing from the embossing caused by the lighting in the detection device. They will generally be within a band close to the paper background values.
  • the embossing is shallow so that the shadows are weak and mainly within a band of 20 grey scale values relative to that of the paper background.
  • the embossed encoding could be extracted using a contrast enhancement routine such as is commonly known as 'equalisation'.
  • a contrast enhancement routine such as is commonly known as 'equalisation'.
  • This type of routine sets the maximum value of the pixels in each channel to 255 and the minimum value to 0 and then attempts to smoothly redistribute the intervening pixel values between the two. This has the effect of increasing the difference between the pixel values close to the paper background and thus those relating to the code so that they are easier to recognise in an image recognition program or routine.
  • This method has the disadvantage that other design features unrelated to the code are still present and need to be disregarded by the recognition routine.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Printing Methods (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Liquid Crystal (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Glass Compositions (AREA)
  • Image Processing (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)

Claims (24)

  1. Ein Substrat, auf dem ein Sicherheitsdokument gedruckt wird, das eine Vielzahl an Identifizierungsmerkmalen auf der Oberfläche enthält, die bei einer Beleuchtung und Darstellung durch Scannen Bilddatensignale in einem photoelektrischen Ausgabegerät erzeugen, welche wie folgt charakterisiert werden:
    (i) der Kontrast zwischen den Identifizierungsmerkmalen und der übrigen Substratoberfläche ist derart, dass Bilddatensignale entsprechend besagter Merkmale kaum von Bilddatensignalen, die sich auf der übrigen Substratoberfläche befinden, und/oder von Störsignale im Hintergrund des photoelektrischen Ausgabegeräts unterscheidbar sind und daher nicht vom Auge unterschieden werden können;
    (ii) die Merkmale wiederholen sich in kurzen Abständen auf zumindest einem Teil des Oberflächenbereichs des Substrats, wodurch bei der Validierung die Zeit oder Position der Signale eines jeden Merkmals zumindest eine festgesetzte Beziehung zu Signalen anderer Merkmalen haben, Dadurch kann ein datenverarbeitendes Gerät, das mit den Bilddatensignalen gespeist wurde, so programmiert werden, dass es feststellen kann, ob Merkmalsignale, die mindestens eine der festgesetzten besagten Beziehungen haben, bei den Daten vorhanden sind, um so zur Identifizierung des dargestellten Dokuments beizutragen.
  2. Ein Substrat nach Anspruch 1, worin die Identifizierungsmerkmale in regelmäßigen Abständen wiederholt werden.
  3. Ein Substrat nach Anspruch 1 oder Anspruch 2, worin jede der Identifizierungsmerkmale in ihrer Art einer jeden der anderen Merkmale auf der besagten Oberfläche ähnelt.
  4. Ein Substrat nach einem der Ansprüche 1 bis 3, worin der Abstand der Identifizierungsmerkmale derart ist, dass er gleichbleibend nur in eine Richtung geht oder nach einem speziellen, bekannten Muster variiert, Ähnliche oder unterschiedliche regelmäßige Abstände werden für Merkmale gewählt, die in eine andere Richtung gehen, wobei eine räumliche Beziehung vorliegt, die im Verhältnis zur ersten Richtung steht, z. B. senkrecht zur besagten Richtung.
  5. Ein Substrat nach einem der Ansprüche 1 bis 4, worin die Merkmale in einer 2D-Matrix auf der Substratoberfläche angeordnet sind.
  6. Ein Substrat nach Anspruch 5, das eine sekundäre Verschlüsselung besitzt, die aus einer in die Matrix eingefügten Abwandlung besteht, wie beispielsweise dem Auslassen von Merkmalen bei bestimmten Positionen in solch einer regelmäßigen Matrix.
  7. Ein Substrat nach Anspruch 5, worin die Matrix aus Merkmalen besteht, die zwei unterschiedliche Ausprägungsarten besitzen, Die Merkmale der einen Art befinden sich auf einer Reihe der Positionen und die Merkmale der anderen Art befinden sich auf anderen Positionen in der Matrix.
  8. Ein Substrat nach einem der Ansprüche 1 bis 7, worin das Identifikationsmerkmal, das auf der Oberfläche verschlüsselt ist, eine primäre Verschlüsselung liefert, die nicht auf dem elektrostatischen Bild eines Photokopiergeräts erscheint.
  9. Ein Substrat nach Anspruch 8, worin die Verschlüsselung des Identifikationsmerkmals aus sich wiederholenden Mustern besteht.
  10. Ein Substrat nach Anspruch 8 oder Anspruch 9, worin die Verschlüsselung des Identifikationsmerkmals aus einer Prägung mit farblosem Tiefdruck oder einer Oberflächenprägung durch Kalandrierung während der Herstellung des Substrats besteht.
  11. Ein Substrat nach einem der Ansprüche 1 bis 10, worin zwei oder mehr unterschiedliche Verschlüsselungstechniken im Substrat kombiniert werden.
  12. Ein Substrat nach Anspruch 11, worin die Identifizierungsmerkmale auf die Oberfläche eines Substrats aufgeprägt werden, auf die ein Sicherheitsdokument gedruckt werden soll, Dieses Substrat besitzt Vertiefungen und/oder Rillen, die mit einem ersten Muster übereinstimmen, in das ein zweites Muster verschlüsselt ist, Somit kann ein auf ein solches Substrat gedruckte Sicherheitsdokument dadurch identifiziert werden, dass Bilddatensignale, die durch Scannen des Dokuments erlangt wurden, einem entsprechenden mathematischen Algorithmus unterlaufen, um festzustellen, ob das zweite Muster bei Bilddatensignalen, die sich aufs erste Muster beziehen, gefunden werden kann.
  13. Ein Substrat nach einem der Ansprüche 1 bis 12, worin das Muster verschlüsselt ist, um Mehrfachwiederholungen eines Codes auf dem Substrat zu produzieren.
  14. Ein Substrat nach einem der Ansprüche 1 bis 13, worin sich das verschlüsselte Muster über ausgewählte Bereiche ausdehnt, die sich auf bestimmte bedruckte Bereiche des Substrats ausrichten.
  15. Ein Substrat nach Anspruch 14, worin die bedruckten Bereiche derart sind, dass sie die Entdeckung der Substratoberflächenvariation während des Scannens und der Umwandlung des Bildes zu Bilddatensignalen verbessern.
  16. Ein oberflächenbehandeltes Substrat nach einem der Ansprüche 1 bis 15, bei dem hellere und dunklere Regionen auf der Oberfläche eines behandelten Bogens des Substrats sichtbar sind, wenn sie zum Scannen beleuchtet werden, Sie sollen für das Auge nicht sichtbar sein.
  17. Ein Substrat nach Anspruch 16, bei dem die Identifizierungsmerkmale während der Herstellung aufgeprägt werden.
  18. Ein Substrat nach Anspruch 16, das Papier- oder Plastikmaterialien, die mit Harz, Lack oder andere Materialien gemischt wurden, so dass für das Drucken eine glatte Oberfläche vorhanden ist, sowie einer verschlüsselten Struktur auf der Oberfläche, so dass die eigentliche Oberfläche glatt genug ist, um Druckfarbe anzunehmen, damit ein Sicherheitsdokument darauf gedruckt werden kann, Gleichzeitig ist jedoch ist ein feines Muster mit weniger glatten Bereichen vorhanden, die die Druckfarbe nicht so sehr aufnehmen.
  19. Ein Substrat nach Anspruch 16, worin ausgewählte Bereiche ein Wiederholungsidentifikationsmuster beschreiben, indem sie mit einer Flüssigkeit wie einem Harz oder einem Lack imprägniert werden, so dass die optische Absorption, die Reflektionseigenschaften oder die optische Dichte des Substrats genügend zwischen imprägnierten und nicht imprägnierten Bereichen verändert werden, um unter einfallendem Licht erkennbar zu sein.
  20. Ein Substrat nach Anspruch 16, bei dem die Oberfläche von einem Laserstrahl geätzt wird, um Löcher oder Rillen in der Oberfläche, die gedruckt werden soll (oder sich vor dem Drucken befindet), einzuarbeiten.
  21. Ein Substrat nach Anspruch 16, das ein Wasserzeichen enthält, um die Dichte und/oder Oberflächenstruktur eines Substrates zu variieren, dessen Variationen unter einfallendem Licht sichtbar gemacht werden können und die primäre und/oder sekundäre Kodierung bilden.
  22. Ein Substrat nach einem der Ansprüche 1 bis 21, das dadurch charakterisiert ist, dass genanntes Substrat ein Sicherheitsdokumentsubstrat ist.
  23. Ein Sicherheitsdokument erfolgt, wenn es auf einem der in einem der Ansprüche 1 bis 22 angegebenen Substrate gedruckt wird.
  24. Eine Methode der Verifizierung eines Sicherheitsdokuments nach Anspruch 22 oder Anspruch 23, worin in einem ersten Verifizierungsschritt ein Scannverfahren angewendet wird, um das Bild der Oberfläche des Substrats des Dokuments in Bilddatensignal zur Steuerung des Druckprozesses, Wenn die Oberflächenkodierung erkannt wird, wird ein zweiter Verifizierungsschritt eingeführt, indem die Bilddatensignale einem geeigneten Algorithmus unterlaufen, besagter zweiter Verifizierungsschritt, dient dazu, dass bei Versagen der Druckprozess zurückgestuft oder blockieren wird, um die Reproduktion des Dokuments zu verhindern, oder zumindest eine hochqualitative Reproduktion davon.
EP00900703A 1999-01-26 2000-01-20 Substrat zum drucken Revoked EP1147495B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9901522.4A GB9901522D0 (en) 1999-01-26 1999-01-26 Substrates for printing
GB9901522 1999-01-26
PCT/GB2000/000129 WO2000045344A1 (en) 1999-01-26 2000-01-20 Substrates for printing

Publications (2)

Publication Number Publication Date
EP1147495A1 EP1147495A1 (de) 2001-10-24
EP1147495B1 true EP1147495B1 (de) 2003-01-02

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EP00900703A Revoked EP1147495B1 (de) 1999-01-26 2000-01-20 Substrat zum drucken

Country Status (10)

Country Link
EP (1) EP1147495B1 (de)
JP (1) JP2002536202A (de)
AT (1) ATE230510T1 (de)
AU (1) AU3063100A (de)
CA (1) CA2357727A1 (de)
DE (1) DE60001098D1 (de)
GB (2) GB9901522D0 (de)
HK (1) HK1043417A1 (de)
MX (1) MXPA01007401A (de)
WO (1) WO2000045344A1 (de)

Cited By (8)

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US7321667B2 (en) 2002-01-18 2008-01-22 Digimarc Corporation Data hiding through arrangement of objects
US7728048B2 (en) 2002-12-20 2010-06-01 L-1 Secure Credentialing, Inc. Increasing thermal conductivity of host polymer used with laser engraving methods and compositions
US7773770B2 (en) 1999-12-28 2010-08-10 Digimarc Corporation Substituting or replacing components in media objects based on steganographic encoding
US7789311B2 (en) 2003-04-16 2010-09-07 L-1 Secure Credentialing, Inc. Three dimensional data storage
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GB2346110A (en) 2000-08-02
GB2346110B (en) 2001-09-05
AU3063100A (en) 2000-08-18
JP2002536202A (ja) 2002-10-29
HK1043417A1 (zh) 2002-09-13
DE60001098D1 (de) 2003-02-06
GB9901522D0 (en) 1999-03-17
ATE230510T1 (de) 2003-01-15
WO2000045344A1 (en) 2000-08-03
MXPA01007401A (es) 2002-06-04
CA2357727A1 (en) 2000-08-03
GB0001165D0 (en) 2000-03-08

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