WO2009071673A1 - Procédé pour générer un code de sécurité pour une mémoire de données d'impression matricielle - Google Patents

Procédé pour générer un code de sécurité pour une mémoire de données d'impression matricielle Download PDF

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Publication number
WO2009071673A1
WO2009071673A1 PCT/EP2008/066908 EP2008066908W WO2009071673A1 WO 2009071673 A1 WO2009071673 A1 WO 2009071673A1 EP 2008066908 W EP2008066908 W EP 2008066908W WO 2009071673 A1 WO2009071673 A1 WO 2009071673A1
Authority
WO
WIPO (PCT)
Prior art keywords
printing
raster
security code
color
print data
Prior art date
Application number
PCT/EP2008/066908
Other languages
German (de)
English (en)
Inventor
Bernhard Wirnitzer
Rainer Gebhardt
Stojan Maleshliyski
Original Assignee
Manroland Ag
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 Manroland Ag filed Critical Manroland Ag
Priority to EP08858174A priority Critical patent/EP2220593A1/fr
Publication of WO2009071673A1 publication Critical patent/WO2009071673A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
    • G06K19/06037—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking multi-dimensional coding
    • 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

Definitions

  • the invention relates to a method for generating a security code for a raster print data storage as well as an article with color raster print data storage according to the preambles of claims 1 and 6.
  • DE 103 45 669 A1 describes for the first time a data carrier with copy protection and a method for generating a security code on the basis of a locally random structural component of the carrier material.
  • a modulating proportion that varies, as it were, from data carrier to data carrier, which is used as an individual security code for the detection of a copy also arises to some extent.
  • this individual security code (possibly encrypted) is stored on a database or additionally on the data medium.
  • DE 10 2004 036 809 A1 and WO 2006/103037 A1 describe a raster print data memory which is particularly suitable for implementing the invention in DE 103 45 669 A1 in the case of printed two-dimensional data memories (also often referred to as 2D matrix codes).
  • the print grid is designed in such a way that the data memory remains readable even at very high resolution printing, ie at very high data densities.
  • DE 10 2004 036 809 A1 describes special pressure symbols in which the printing ink can run in a targeted manner without destroying the readability. In a mass production of data storage, this is of particular importance, since the amount of ink application can never be kept exactly constant.
  • the print symbols of the raster print data memory can encode additional information due to the use of different colors.
  • DE102005013962 A1 describes the use of the technology for producing counterfeit-protected documents. The goals are a simple low-cost production and the possibility of verification with simple flatbed scanners. The object of cost-effective production is achieved in that the, according to DE 103 45 669 A1 required, detection of the individuality of the printing is achieved by producing a special document paper. The document paper serves as a cheap, mass-produced semi-finished product for the forgery-proof document. In order to enable the use of simple flatbed scanners in the verification, a special calibration element is introduced according to DE 10 2005 013 962 A1.
  • the codes must be printed with high spatial resolution in order to have sufficient memory capacity for applications.
  • a high spatial resolution is also necessary for a secure counterfeiting contactor, because only then is the printed image individual. This is especially true in the production in offset or flexographic printing.
  • Printed raster print data memories of high spatial resolution unfortunately require relatively expensive optoelectronic readers with high spatial resolution.
  • the invention is therefore based on the object of the known methods, techniques and markers to expand to the effect that for a mass-produced raster print data storage a cost-effective security code is provided, which makes it possible to detect illegal copies with simple means.
  • the method should be particularly suitable for labeling of products or packaging with the aim of combating piracy and it should be easy integration in printing or packaging machines to be possible. The detection of counterfeit packaging should also be possible without individual scanning of each printed product or package.
  • grid point smallest area in a digital raster image that can be filled with color or embossed or engraved
  • grid cell a coherent area made up of at least one grid point
  • pressure symbol or symbol
  • color screen cell grid cell composed of halftone dots of different or the same color, which produces a visual color impression when viewed with the human eye
  • Colored print symbol or color symbol color grid cells with defined screen halftone dots for information coding
  • color screen print data memory a raster print data memory constructed from colored print symbols
  • Fractal raster print data memory a raster print data memory which is decodable with different triggering of the readers; a special case is a color raster print data memory constructed of print symbols.
  • epicode a random code created during the production of a raster print data memory
  • the individual data memories are produced in a multi-stage production process.
  • Multi-stage manufacturing processes are e.g. Printing methods in which the printing ink or the printed image is brought onto a printing material by means of a printing form, such as, for example, in the case of the high-pressure method (letterpress printing, flexographic printing or embossing in which a printed image without color is formed, etc.), in the planographic printing process (offset printing, lithography, etc.), gravure printing (doctor blade gravure, steel engraving, etc.) or in the screen printing process.
  • the high-pressure method letterpress printing, flexographic printing or embossing in which a printed image without color is formed, etc.
  • planographic printing process offset printing, lithography, etc.
  • gravure printing doctor blade gravure, steel engraving, etc.
  • Multi-stage manufacturing processes are also found in color printing machines (e.g., color laser printers or color ink jet printers) in which the color image is composed of multiple color components.
  • color printing machines e.g., color laser printers or color ink jet printers
  • a first security code is created by the individuality in the production of the printing form for offset printing.
  • the cause of the individuality may e.g. through the individuality of the material, through
  • the security code may be obtained by a survey (e.g., image capture, 3D survey, etc.) of the printing form.
  • a survey e.g., image capture, 3D survey, etc.
  • 3-D measurement signals can also be reduced to 2-D data fields, in complete analogy to the reduction of two-dimensional pixel fields to information bits in the decoding of matrix codes (see DE 10 2004 036 809 A1).
  • the individuality of the printing form can also be determined by means of (trial) printing.
  • the individuality of the printing form is superimposed by the local individuality of the (possibly flowing) printing ink and the printing substrate.
  • the individuality of the printing form is determined.
  • the individuality of the printing form according to the invention is the basis for a security code that hovers over the actual data with the production of the printing form, previously unused. Quantization of the target-actual deviation results in a security code, which will henceforth be called the epicode of the printing form.
  • the epicode can now (possibly with PKI, public key infrastructure, encrypted /
  • Encryption are stored in a database or it is encrypted (for example with PKI) stored on the disk and uniquely identifies all
  • a printing plate in print production is already a two-stage production process in itself.
  • the printing form itself is created again in a multi-stage process.
  • a film may first be exposed, after which a printing plate is produced using the film.
  • each manufacturing step generates its own epicode, which can also be determined separately. Specifically, first the epicode of the film is measured and then the epicode of the printing form, which contains the epicode of the film.
  • the individual epicodes of each stage for many manufacturing processes, at least in (local) spectral bands are, to a good approximation, independent, additive, mean-free quantities, which can therefore be separated by averaging.
  • the printing form With the production of data storage, the printing form is exposed to natural wear. This slowly changes the epicode of the printing form. This change is recorded during production (possibly also in the form of an estimated model) and stored in the database. As a result of this procedure, a so-called overproduction can in principle also be recognized despite the use of the same printing form. If a manufacturer produces more data stores than the owner of the data allows, the overproduced data stores will have an increasingly different epicode and illicit production may be detected. Also, the removal of data storage during production will be detectable by jumps in the epicode.
  • a second security code solves the resulting additional task.
  • the epicode of each individual pressure is determined, as already described in DE 103 45 669 A1.
  • the epicode of the printing plate can then, at least in certain (local) frequency bands, by averaging the
  • Epicodes of individual prints are determined.
  • the method described in DE 103 45 669 A1 can thereby, as first experiments show, unexpectedly strong can be improved by the epicode of the printing form is deducted from the epicode of the individual printing.
  • the reader determines the epicode of the data store and correlates it with the target epicode of the particular stage of the manufacturing process.
  • the SoII epicodes can be loaded from a database or read from the data store and decrypted. Only the target epicode of the last stage of the manufacturing process is an individual code that has to be stored per single print.
  • the target epicodes of all other stages are not variable or can be modeled by constants and thus can be stored as constant data in a memory area of the data carrier (for example with PKI) in encrypted form (for example, machine-readable). This saves the database.
  • the data memory described in DE 10 2004 036 809 A1 is used for this purpose.
  • the epicode principle can be transferred to other storage technologies and in particular to 3-dimensional storage structures.
  • the printing form or the article which were possibly produced for a completely different (printing) application, receive a raster print data memory, which is measured and evaluated as described above.
  • the (possibly encrypted) data in the memory can then be stored e.g. describe the owner, the manufacturing process, the date of manufacture, etc. For example, laser-engraved printing plates for flexographic printing,
  • stamp rubber parts or glass parts are marked in such a way.
  • a possible application of the above-described copy protection method is possible in particular in indirect printing methods, which was also described above under the name of multi-stage printing method, as can apply to the offset or gravure printing method.
  • the printing form (e.g., printing plate, gravure roll / gravure printing cylinder in gravure printing, etc.) serves as a transfer member for the ink, on which a targeted distribution of color through previously generated surface properties (surface tension, cell distribution) is made possible.
  • Each printing plate has specific properties due to its production, which enables unambiguous recognition by the method described above.
  • the handling may be such that during a run periodically data codes and the associated epicodes are captured and stored by the printed surface.
  • Possible variants of the method are then designed as follows:
  • the acquisition of one or more datagrids can take place in different ways: a. fully automatic by an independent recognition of the position of the markings.
  • the recognition software is able to recognize the typical Datagrid features in the printed areas of the sheet and to read them in here.
  • scanning should be one-dimensional or two-dimensional.
  • b. fully automatic and self-learning storing the position to scan faster in further measurements).
  • the frequency of data collection can be triggered by various events:
  • Characteristic values (dot gain, density, color locus or the like) which may have been recorded with measuring devices that are available on the press and used inline or manually.
  • the sheets to be measured can be manually removed on request by a signal (acoustically or visually) or automatically discharged (eg, sheet diverter), if necessary also fed to the detection device.
  • a signal acoustically or visually
  • automatically discharged eg, sheet diverter
  • Another embodiment is that the data codes recorded during the manufacturing process are compared and evaluated. If the number of copies is high, it is to be expected that typical changes will occur as a result of
  • algorithms of image processing can be applied to the datagrids, which are also set in correlation with quality criteria typical of print quality (dot gain, density, color location, minimized dampening solution guide).
  • This evaluation provides information that can be provided to the printer for operation to take action, if necessary, to achieve a stable print quality. Also possible is an automatic tracking of the corresponding manipulated variables (for example, colorant and fountain solution guidance, temperature .).
  • a particular application of the invention is seen in the manufacture of so-called blister packages in which a tool is used to bond a cover sheet to a backing material, usually with the aid of pressure and temperature.
  • the tool usually consists of a dot matrix. This dot matrix is replaced by a raster code data memory and thus allows a forgery-proof identification of the blister.
  • the task of decoding the raster code data memory using the camera of a mobile telephone or another mobile terminal has not yet been solved and to recognize counterfeits with the help of the Epicodes.
  • a problem is the low spatial resolution of the cameras, which is not sufficient to resolve the individuality of the print.
  • a colored raster print data memory according to main claim 6.
  • the raster print data memory By designing the raster print data memory as a color code and producing it in a multi-step printing process, a relatively easy-to-measure epicode is created as it were.
  • Each color component of the memory is generated by its own printing stage, whereby the color components always have a random offset.
  • Each printing plate produces an epicode.
  • the always occurring offset of the printing plates in the production machine as well as the additional offset of the color components by positioning inaccuracies of the paper guide during printing produce an epicode that can be used for the protection against counterfeiting.
  • Colored digital printing techniques such as Color laser printing or color inkjet printing
  • Color laser printing or color inkjet printing are also seen as a multi-stage printing process in the context of the invention. It is particularly advantageous that the information is stored in the color screen data memory with which multi-stage manufacturing process of data storage was produced. Of course, the information can also be stored indirectly via a stored database or Internet address.
  • Claim 9 describes the overlaying of the color raster print data memory with an additional micro-grid, which again as a raster print data memory is designed.
  • a fractal raster print data memory places particularly low demands on the printing technology and can also be decoded with readers of different spatial resolution. With locally high-resolution (possibly monochrome) readers, more information than with a low-resolution color sensor can then be extracted.
  • an additional epicode of higher security is created. This is particularly interesting when used for counterfeit protection, in which readers are offered for different security levels.
  • Fractal raster print data memories are an easy way to provide any monochrome barcodes or 2-D barcodes with a security code (Epicode) according to the invention, according to claim 10. Rasterized the printed and unprinted areas of the monochrome barcode and in different, preferably complementary colors Thus, from such printing by color image processing, a monochrome image of the original bar code and a monochrome raster image can be produced. From the monochrome raster image, the EpiCode can then be extracted.
  • the grid can preferably be designed as a raster print data store.
  • FIG. 1 shows the prior art disclosed in DE 10 2004 036 809 A1 for a so-called S2i raster print data memory which is constructed from raster cells which are composed of 6 ⁇ 6 raster dots.
  • the symbols 5, 6, 7, 8 used for data storage of 2 bits are constructed from the mathematically orthogonal patterns 1, 2, 3, 4.
  • the pattern pairs 1 and 2 each have the diagonal corners and the pattern pairs 3 and 4 the adjacent middle fields. In each case one of the pattern pairs is selected to obtain the symbols 5, 6, 7, 8.
  • Fig. 2 illustrates the transition to the color raster print data memory. Different colors are represented by different textures.
  • the new pattern 9 is created by combining the pattern 1 with the pattern 2. Pattern 1 and pattern 2 are preferably in complementary colors executed, eg in the combinations red cyan, green - magenta, blue - yellow or as a special case white - black. In the pattern 9, the diagonal corners of a rectangular field are respectively occupied by pairwise complementary colors, eg red cyan. Pattern 10 is complementary to pattern 9.
  • Pattern 11 is formed by performing and combining patterns 3 and 4 preferably in complementary colors, ie, the unoccupied fields of patterns 9 and 10, respectively, are occupied on the respective opposite sides by pairwise complementary patterns. This allows further 3 bits to be coded. 13, 14, 15, 16 show by way of example how the patterns 9, 10, 11, 12 are combined to form color symbols. There are a total of 64 different combination options, which corresponds to a coding of 6 bits. Additional storage of 3 bits can be achieved by occupying the central panel with one of the 8 colors. In a color symbol, a total of 9 bits are encoded. Individual halftone dots or even groups of halftone dots may shift slightly during printing with respect to the nominal grid, which is indicated in the figure. A further increase in information density results from the use of additional colors and their complementary colors.
  • FIG. 3 shows the prior art disclosed in DE 10 2004 036 809 A1 for a special S2i raster print data memory, as it is used in particular at high print resolutions.
  • the symbols 17, 18, 19, 20 are formed from the symbols 5, 6, 7, 8 by omitting individual grid points on the edge, taking care that the patterns selected from the pattern pairs adjoin in as many grid points as possible. The omission of the halftone dots allows a targeted color bleeding and promotes a clear expression of the epicodes.
  • the grid points in the middle of the grid cell are occupied to different degrees.
  • FIG. 4 illustrates how the color symbol 9 in FIG. 2 forms a fractal color blank data memory. Different colors are represented by different hatching.
  • the color print symbol 9 initially has 6x6 color grid points.
  • Each 2x2 color grid points have the same color. These 2x2 color raster points are now replaced by 2x2 symbols 17 to 28 of FIG.
  • the patterns in the colors cyan, magenta, yellow and black are rasterized by 6x6 monochrome symbols. Patterns in the colors red, green and blue are achieved by additive color mixing.
  • the inks cyan, magenta, yellow and black, e.g. the color blue due to the mixture of magenta and cyan.
  • black is added in the middle.
  • green and red are formed by mixing cyan with yellow and yellow with magenta.
  • the color white can be achieved by combining blue, green and red symbols.
  • the color screen data memory according to FIG. 4 can be recorded with the camera of a mobile phone without special intent optics and decoded by the computer of the mobile phone.
  • the relatively high demands on the color print cause a (color) epicode, which is surprisingly usable for the recognition of a copy.
  • the fine grid underlying the color symbols can additionally be recorded and decoded using high-resolution monochrome or color cameras.
  • the color raster print data memory described in FIGS. 1 to 4 enables simple production in the mass printing method and at the same time testing and decoding with the aid of digital color cameras, as are installed in many mobile telephones.
  • the color screen accumulator can also be designed differently.
  • any color image produced in raster print can be used as raster image with superimposed epicode used according to the invention.
  • the raster image encodes image information which - due to the redundancy in real images - can be decoded without errors after production despite errors.
  • the epicode arises almost incidentally through the manufacturing process and is u. a. by the individuality, the pressure levels or printing plates responsible for the individual color components and their interactions. Due to the error-free decoding of the image information, a detection of the epicode is possible after production.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Editing Of Facsimile Originals (AREA)

Abstract

L'invention concerne un procédé pour générer un code de sécurité pour une mémoire de données d'impression matricielle à haute densité de données, à lecture optique, appliquée sur un objet ou un support d'impression à l'aide d'un processus d'impression en plusieurs étapes, caractérisé en ce que le caractère unique d'au moins une étape du processus d'impression est mesuré, comparé avec des valeurs de consigne et un code de sécurité est calculé à partir du résultat puis mémorisé. L'invention concerne également un objet comprenant une mémoire de données d'impression matricielle en couleur avec code de sécurité appliquée au cours d'un processus en plusieurs étapes.
PCT/EP2008/066908 2007-12-06 2008-12-05 Procédé pour générer un code de sécurité pour une mémoire de données d'impression matricielle WO2009071673A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08858174A EP2220593A1 (fr) 2007-12-06 2008-12-05 Procédé pour générer un code de sécurité pour une mémoire de données d'impression matricielle

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102007059022 2007-12-06
DE102007059022.0 2007-12-06
DE102008025785A DE102008025785A1 (de) 2007-12-06 2008-05-29 Verfahren zur Erzeugung eines Sicherungscodes für einen Rasterdruckdatenspeicher und Gegenstand mit Farbrasterdruckdatenspeicher
DE102008025785.0 2008-05-29

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Publication Number Publication Date
WO2009071673A1 true WO2009071673A1 (fr) 2009-06-11

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EP (1) EP2220593A1 (fr)
DE (1) DE102008025785A1 (fr)
WO (1) WO2009071673A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8756707B2 (en) 2008-10-06 2014-06-17 De La Rue International Limited Method of manufacturing security document and method for authenticating the document
US8792090B2 (en) 2008-11-14 2014-07-29 De La Rue International Limited Document of value, method of manufacture and method of detecting soil or wear

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10345669A1 (de) * 2003-10-01 2005-05-12 Bernhard Wirnitzer Datenstreifen mit Kopierschutz und Verfahren zum Codieren solcher Datenstreifen
EP1788516A1 (fr) * 2005-10-28 2007-05-23 ATT- Advanced Track & Trace S. A. Procédé et dispositif d'authentification et/ou d'identification

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005013962B4 (de) 2003-10-01 2009-04-30 Wirnitzer, Bernhard, Prof. Dr. Dokumentenpapier mit aufgedrucktem Sicherheitselement und Verfahren zum Erstellen fälschungsgeschützter Dokumente
DE102004036809A1 (de) 2003-10-01 2006-03-23 Wirnitzer, Bernhard, Prof. Dr. Rasterdruckdatenspeicher und Verfahren zum Codieren der Daten
DE102005014687A1 (de) 2005-03-29 2006-10-12 Henkel Kgaa Zusammensetzung enthaltend ß-Defensin 2

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10345669A1 (de) * 2003-10-01 2005-05-12 Bernhard Wirnitzer Datenstreifen mit Kopierschutz und Verfahren zum Codieren solcher Datenstreifen
EP1788516A1 (fr) * 2005-10-28 2007-05-23 ATT- Advanced Track & Trace S. A. Procédé et dispositif d'authentification et/ou d'identification

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8756707B2 (en) 2008-10-06 2014-06-17 De La Rue International Limited Method of manufacturing security document and method for authenticating the document
US8792090B2 (en) 2008-11-14 2014-07-29 De La Rue International Limited Document of value, method of manufacture and method of detecting soil or wear

Also Published As

Publication number Publication date
EP2220593A1 (fr) 2010-08-25
DE102008025785A1 (de) 2009-06-10

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