WO2010094859A2 - Procede et dispositif de securisation de documents contre la contrefaçon - Google Patents
Procede et dispositif de securisation de documents contre la contrefaçon Download PDFInfo
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- WO2010094859A2 WO2010094859A2 PCT/FR2010/000136 FR2010000136W WO2010094859A2 WO 2010094859 A2 WO2010094859 A2 WO 2010094859A2 FR 2010000136 W FR2010000136 W FR 2010000136W WO 2010094859 A2 WO2010094859 A2 WO 2010094859A2
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- WIPO (PCT)
- Prior art keywords
- document
- mark
- marks
- marking
- marking means
- Prior art date
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Classifications
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- 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
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- 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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/04—Preventing copies being made of an original
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- 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
- G07D7/003—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 using security elements
- G07D7/0034—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 using security elements using watermarks
-
- 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
- G07D7/06—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 using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/128—Viewing devices
Definitions
- the present invention relates to a method and a device for securing documents against counterfeiting. It applies, in particular to all documents or flat products and, at least partially, transparent, for example paper, plastics, fabrics or glass.
- the present invention provides methods for inserting copy-sensitive codes into images, substrates and, in particular, into bank note watermarks, as well as for reading and extracting data from these codes.
- counterfeiters use very advanced technical means to imitate them.
- each new security measure adopted for example inclusion of metal son possibly carrying a micro-writing, addition of a watermark or a hologram or insertion of fibers in the paper, counterfeiters replicate by means simulating or reproducing the characteristics additional.
- the means of verifying the authenticity of these documents can not be distributed, both because of their complexity and their cost and because of the security risk that their dissemination would cause. Indeed, by procuring it, a forger could know how it works and further improve the similarity between authentic documents and false documents.
- watermarks are produced during the paper production phase and are part of the paper. They can not be erased or damaged by the wear of paper, which makes it an advantageous means of protection especially for banknotes, which must be able to withstand significant wear.
- the cylinder mold watermark technique is the most widely used for banknotes, passports and other valuable documents.
- This type of watermark incorporates a tonal depth corresponding to a grayscale image, and is created by raised surfaces on the surface of the cylinder that compresses the paper pulp.
- the watermark is a means of first-level protection, that is to say, it allows the holder of the document to determine the authenticity in a purely sensory manner: typically, the document is placed between the eye and a light source, and an image appears in transparency depending on the thickness or density of the paper fibers.
- US Pat. No. 7,286,682 discloses a technique for simulating a watermark effect by synchronizing the front and back printing of a document and locally varying the dot phase between the two sides of the document. By observing the document in front of a light source, an image appears whose lighter areas correspond to the positions where the frame dots are superimposed, and the darker areas correspond to the positions where the screen dots are shifted.
- the present invention aims to remedy these disadvantages.
- the present invention aims, in a first aspect, a method of securing a document, characterized in that it comprises: - a first step of forming a first mark on a first face of said document by putting implementation of the first marking means,
- the present invention aims, according to a second aspect, a method of securing a document, characterized in that it comprises:
- At least one of said marks exhibiting, due to punctual unpredictable physical phenomena of its marking means, a point error rate greater than a predetermined value.
- the error rate in an image of superimposed markings illuminated by backlighting combines the characteristics of the two brands with those of unpredictable errors generated by their marking. This amplifies the copy detection capability of each mark of the document.
- the method which is the subject of the present invention comprises a step of estimating the probability of error that an area, colored or not, of at least one mark is confounded with a zone, uncolored or colored with a another color, according to a marking parameter value implemented by the marking means and a step of selecting a parameter value corresponding to a probability between two predetermined values.
- the predetermined values frame the value of 22%.
- At least one of the marks carries, in a coded manner, with redundancies, an identifier of the document.
- Such a mark makes it possible to quickly identify the document by reading its coded identifier.
- the marks have complementary colors. Thanks to these provisions, the original viewed by transparency has black areas while a copy in which the marks do not overlap as well will present colored areas.
- At least one of the marks comprises hatched cells.
- the hatches thus have a higher resolution than the cells and allow the transport of information with a lower resolution allowing a reading with a less expensive reader since it does not have to read the hatching but only the cells.
- each colored element of one of the marks is superimposed on the absence of marking of the other mark, with the exception of elements having no marking in the two marks and representing a coded message.
- the marks are formed of a matrix of rectangular zones, one of the marks, once seen by transparency, being formed of colored zones which are superimposed on the centers of the unstained zones of the other mark.
- the offset of the colored areas with respect to the centers, in a copy, makes it possible to detect this copy.
- the present invention aims, according to a third aspect, a device for securing a document, characterized in that it comprises:
- the said marking means being adapted so that the two marks are superimposed
- At least one of said marking means being adapted to form a mark whose copy using identical marking means causes an error rate, measured point by point, greater than a predetermined value.
- the present invention aims, according to a fourth aspect, a device for securing a document, characterized in that it comprises:
- first marking means of a first mark representative of a first dot matrix on a first face of said document second means of marking a second mark representative of a second dot matrix on another face of said first dot of said document; document or in the thickness of that document, the said marking means being adapted so that the two marks are superimposed and
- At least one of said marking means being adapted so that at least one said mark exhibits, because of punctual unpredictable physical phenomena of its marking means, a point error rate greater than a predetermined value.
- the present invention is directed to a computer program that can be loaded into a computer system, said program containing instructions for implementing the method that is the subject of the present invention, as briefly described above.
- the present invention aims at a support for information readable by a computer or a microprocessor, removable or not, retaining instructions of a computer program, characterized in that it allows the implementation of the method object of the present invention as succinctly set forth above.
- the present invention relates to a document comprising:
- the present invention relates to a document comprising:
- FIG. 1 represents, schematically, enlarged, an impression on a first face of a first document, seen through the document,
- FIG. 2 represents, schematically, enlarged, a watermark of the first document illustrated in FIG. 1, seen in transparency;
- FIG. 3 is a schematically enlarged representation of an impression on a second face of the first document illustrated in FIGS. 1 and 2; in direct view,
- FIG. 4 is a diagrammatic enlarged representation of the superimposition of the prints of FIGS. 1 and 3 and of the watermark of FIG. 2, when the first document is seen by transparency, with a backlight, according to a first embodiment;
- FIG. 5 represents, schematically, enlarged, an impression on a first face of a second document, seen through the document,
- FIG. 6 represents, schematically, enlarged, a watermark of the second document illustrated in FIG. 5, seen in transparency;
- FIG. 7 represents, schematically, enlarged, an impression on a second face of the second document illustrated in FIGS. 5 and 6, in direct view,
- FIG. 8 represents, schematically, enlarged, the superposition of the prints of FIGS. 5 and 7 and the watermark of FIG. 6, when the second document is seen by transparency, with a backlight, according to a second embodiment
- FIG. 9 represents, partially, the two faces of a third document, according to a third embodiment
- FIG. 10 represents, partially, the two faces of a fourth document, according to a fourth embodiment
- FIG. 11 represents, partially, the two faces of a fifth document, according to a fifth embodiment
- FIGS. 12 and 13 represent, partially, the two faces of a sixth document, according to a sixth embodiment
- FIGS. 14 and 15 represent, partially, the two faces of a seventh document, according to a seventh embodiment
- FIGS. 16 and 17 represent, partially, the two faces of an eighth document, according to an eighth embodiment
- FIG. 18 schematically represents a watermark
- an impression on a first face comprises a horizontal straight line segment 105 and a vertical straight line segment 110.
- FIG. 2 shows that, seen in transparency through the first document, for example by backlighting, a watermark 115 is a mark whose copy by using marking means identical to those used to form said watermark 115 causes an error rate, measured point by point, greater than a predetermined value, for example thirty percent.
- the watermark 115 has, due to punctual unpredictable physical phenomena of its marking means, a point error rate greater than a predetermined value, for example twenty percent.
- FIG. 3 shows that, in a direct view of the first document, an impression on a second face comprises a horizontal straight line segment 125 and a vertical straight line segment 120. It can be seen in FIG. , for example by backlighting, the two impressions 105, 110, 120 and 125 form two corners of a rectangle, this rectangle delimiting, in the watermark 115, an area of interest where a message is coded according to known techniques. Preferably, the portion of the watermark 115 outside the rectangle delimited by the lines carrying the segments 105, 110, 120 and 125 bears a second message.
- Each of the messages considered represents an identifier of the first document, for example a serial number, and possibly, its model, its place of manufacture and its date of manufacture.
- FIG. 5 shows that, seen in transparency through the second document, for example by backlighting, an impression on a first face comprises a horizontal straight line segment 205 and a vertical straight line segment 210.
- a watermark 215 is a mark whose copy by using marking means identical to those used to form said watermark 215 causes a error rate, measured point by point, greater than a predetermined value, for example thirty percent.
- the watermark 215 has a point error rate greater than a predetermined value, for example of twenty percent.
- FIG. 7 shows that, in direct view of the second document, an impression on a second face comprises a horizontal straight line segment 225 and a vertical straight line segment 220.
- FIG. 8 shows that, seen in transparency, for example by backlighting, the two impressions 205, 210, 220 and 225 form two corners of a rectangle, this rectangle delimiting, in the watermark 215, a zone of interest where a message is encoded according to known techniques.
- the part of the watermark 215 outside the rectangle delimited by the lines carrying the segments 205, 210, 220 and 225 carries a second message.
- Each of the messages considered represents an identifier of the first document, for example a serial number, and possibly its model, location and date of manufacture.
- the two impressions 205, 210, 220 and 225 are, at least in part, outside the rectangle they delimit. Counterfeiting of the second document illustrated in FIGS. 5 to 8 is thus even more difficult than that of the first document, illustrated in FIGS. 1 to 4.
- FIG. 9 shows two impressions formed on two sides of a third document, one of the impressions being viewed in transparency. It is observed that the printing 305 is the negative of the printing 310. Each of the prints 305 and 310 is a mark whose copy using marking means identical to those used to form said printing causes an error rate. , measured point by point, greater than a predetermined value, for example twenty-five percent.
- each of these prints 305 and 310 has, due to punctual unpredictable physical phenomena of its marking means, a point error rate greater than a predetermined value, for example fifteen percent.
- At least one of the prints 305 and 310 carries, in a coded manner, with redundancies (preferably error correction codes, or "CRC” for "cyclic redundancy check”), an identifier of the third document.
- redundancies preferably error correction codes, or "CRC” for "cyclic redundancy check
- the two impressions are identical, once one of the two views is transparent, that is to say that each element of one is superimposed on one element of the other, but has complementary colors, in which case the original, seen by transparency seems formed of black dots on a white background while the copy will present colored areas.
- Figure 11 illustrates a variation where the elementary cells of at least one of the anti-copy marks 325 and 330 are gray or hatched.
- FIG. 10 shows two impressions formed on two sides of a fourth document, one of the impressions being seen in transparency.
- the printing 315 is the negative of the print 320, with the exception of dots 322, which remain transparent in the two prints and which represent, in a coded manner, an identifier of the fourth document.
- each element of one of the marks is superimposed on the absence of marking of the other mark, with the exception of elements presenting a lack of marking in the two marks and representing a coded message, for example by their position. in marks 315 and 320.
- Each of the prints 315 and 320 is a mark whose copying using marking means identical to those used to form said printing causes an error rate, measured point by point, greater than a predetermined value, for example twenty -five percent.
- a predetermined value for example twenty -five percent.
- each of these prints 315 and 320 has, due to punctual unpredictable physical phenomena of its marking means, a point error rate greater than a predetermined value, for example fifteen percent.
- Each of the prints 315 and 320 carries, in a coded manner, with redundancies (CRC error correction codes), an identifier of the fourth document.
- FIGS. 12 and 13 we observe the case where one, 340, of the impressions, once seen by transparency, is formed of dark points which are superimposed on the centers of the light areas of the other impression 335. More generally, in Embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, More generally, in embodiments, the marks are formed of a matrix of rectangular zones, one of the marks, when viewed by transparency, being formed of colored zones which are superimposed on the centers of the zones. unstained from the other brand. FIGS. 14 and 15 show the case where each of the impressions 345 and 350, once one of the impressions viewed by transparency, are formed of dark areas which are superimposed on the light areas of the other printing.
- Each of the prints illustrated in FIGS. 12 to 17 is a mark whose copy using marking means identical to those used to form said printing causes an error rate, measured point by point, greater than a predetermined value, by example of twenty-five percent.
- each of these impressions has, due to punctual unpredictable physical phenomena of its marking means, a point error rate greater than a predetermined value, for example fifteen percent.
- at least one of the prints is a digital authentication code.
- the digital authentication codes also referred to as "CNAs" are digital images which, once marked on a medium, for example by local printing or modification of the medium, are designed so that some of their properties, in general automatically measured from a captured image, are modified if a marked image is copied.
- the digital authentication codes are generally based on the degradation of one or more copy-sensitive signals during the copying step, a signal being carried by image elements with measurable characteristics sensitive to copying. Certain types of digital authentication codes may also contain information making it possible to identify or trace the document that contains it. There are several types of digital credentials, including those described below.
- the copy detection patterns also referred to as "MDC" are dense images, generally pseudo-random in nature. Their reading principle is based on an image comparison to measure an index of similarity (or dissimilarity) between the original copy detection pattern and the captured copy detection pattern, for example by an image sensor : if this captured pattern is a copy, the similarity index will be lower than if it is an original.
- Secure Information Matrices also referred to as "MIS" later, are, just like two-dimensional barcodes, images designed to carry a large amount of information in a robust manner.
- secure information matrices are copy-sensitive. On reading, an error rate of the coded message extracted from the matrix is measured, which rate is higher for copies than for originals, making it possible to distinguish these copies from the original prints.
- the copy detection patterns and the secure information matrices are visible.
- marking copy detection patterns and secure information matrices invisibly is not always possible due to manufacturing or cost constraints.
- the visibility of an anti-copy mark can be a disadvantage in terms of aesthetics and, in some cases, in terms of security because the counterfeiter is informed of their presence.
- digital authentication codes that are naturally invisible or, at least, difficult to notice.
- watermarks embedded in printed images are designed to be damaged when the printed image is reproduced, for example by photocopying. Measuring the degree of degradation of the digital watermark, which is lower in the original print than in a copy of it, makes it possible to detect these copies.
- the combination of several watermarks with different degrees of copy sensitivity allows, by a comparison of the respective energy levels, to detect the copies.
- the integration of digital watermarks into the document production process is however more complex, which limits their use: unlike copying patterns and secure information matrices, the digital watermark can not be simply "Added” to the image; the digital watermark is indeed a complex function of the message to be added and the original image, the energy of the digital watermark being locally adjusted according to the masking properties of the original image.
- Embedding digital watermark on documents or products involves sending the source image to a central marking / printing unit that integrates the digital watermark and returns a marked image. This procedure is impractical due to the often very large file size and associated image security issues.
- the source image must not be sent to the central marking / printing unit: conversely, it is the image of the copy detection pattern or the secure information matrix, of a very small size in general, for example a few kilobytes, which is sent to the holder of the image files that will be affixed to the document or product.
- reading digital watermarks is particularly difficult to stabilize, making the determination of the copy compared to the original of a document more random. Indeed, the risks of error are generally much higher with the digital watermarks only with copy detection patterns and secure information matrices.
- MSMA asymmetric modulation spatial marking methods
- MSMAs allow invisible marking, or at least discreet, documents.
- MSMAs are, in general, dot patterns, which are added to the document to be marked as an additional layer. For example, in the case of an offset printing process, an additional plate supporting only the MSMA is overprinted on the document.
- MSMAs integrate more easily than digital watermarks in the document production process, the source image not being necessary for the central marking / printing unit.
- An object of the present invention is to provide methods for producing watermarks that are extremely difficult, if not impossible, to copy.
- methods are described for embedding watermarked CNAs in documents as well as for reading these CNAs.
- a figurative image is received in shades of gray or in binary values. We consider that this image is digitized to be exploitable with image processing software. For illustrative purposes, a binary watermark 405 is shown in Figure 18. The DAC is associated with the figurative image in several possible ways. Non-exhaustive:
- the CNA is a "dense” MIS or an MDC 410 is inserted separately into the image, without being integrated therein, as illustrated in FIG. 19, the CNA is a "digital watermark” or an MSMA 415 is integrated in the image, as illustrated in FIG. 20,
- the CNA is a low-density MIS 420 is integrated into the figurative image by modulating the value of the coded areas, either at their size, as shown in Figure 21, or at their depth.
- this error rate makes the assumption of a "perfect" reading, and is in general less than the error rate obtained during the reading in operation, for example for the case of watermarks with the transmitted light.
- specific counterfeiters are able to obtain an accurate measurement of the watermark, the thickness and / or the density of the paper, using for example an electron microscope.
- codes are implemented that are inherently sensitive to the copy. That is, degradation of code values occurs automatically and naturally in the process of making the copy.
- a test watermark is first generated, using or not a figurative image, and a plurality of zones, each having a predetermined size and / or a predetermined depth, are integrated therein. .
- a certain amount of paper is made using this watermark, and the average and variability of the paper fiber thickness or density is measured for each of the predetermined areas. It may be easier to measure the gray level of the area illuminated by transparency, which will be higher (the area becomes lighter) if the thickness or density of paper fiber decreases.
- an error probability estimation step is carried out whereby an area, whether colored or not, of at least one mark is confused with an area that is not colored or colored with another color, depending on minus a marking parameter value implemented by the marking means and a step of selecting a value of each parameter corresponding to a probability lying between two predetermined values, preferably which surround the value of 22%.
- the NAC is integrated into the figurative image according to the NAC's own process (see above). For example, if a set of positions are predetermined by a key, the depth and / or the surface of the zone to be embossed corresponding to the value that is to be assigned locally is varied in these positions. For a binary modulated signal, the two possible surface values are determined beforehand.
- the detection is done as it is commonly done for CNAs from digitized images. However, scanning can be done in a manner suitable for watermark capture. For example, a flatbed scanner can be used in the transparency scan mode. Note that it may be necessary to invert the image. More precise measurements of the surface can be made from tools such as an electron microscope. In variants:
- the CNA is generated according to the duplex printing method described in US Pat. No. 7,286,682.
- the local phase variations are modulated to be in the order of magnitude of the natural variation in the positioning of the the impression. For example, if this variation is plus or minus 100 microns, we create a watermark simulation of this order of magnitude, so as to obtain a natural degradation of the watermark,
- CNAs are generated with different degradation rates, for example by varying the size of the cells.
- the ratio of degradation rates then gives an indicator of nature (original or copy) of the NAC. This gives an indicator that is more robust in case of aging or wear.
- - Printed markers are used to locate the NAC's watermark, so that it has a more accurate positioning
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- Computer Security & Cryptography (AREA)
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Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201080017240.2A CN102405140B (zh) | 2009-02-18 | 2010-02-18 | 保护文档以防止伪造的方法和设备 |
RU2011138308/12A RU2011138308A (ru) | 2009-02-18 | 2010-02-18 | Способ и устройство для защиты документов от подделки |
EP10708242.2A EP2398652B1 (fr) | 2009-02-18 | 2010-02-18 | Procede et dispositif de securisation de documents contre la contrefaçon |
JP2011550617A JP2012517921A (ja) | 2009-02-18 | 2010-02-18 | 文書を偽造から保護する方法および装置 |
US13/202,198 US8736910B2 (en) | 2009-02-18 | 2010-02-18 | Method and device superimposing two marks for securing documents against forgery with |
BRPI1008450A BRPI1008450A2 (pt) | 2009-02-18 | 2010-02-18 | processo e dispositivo para proteger documentos de contrafação |
AU2010215353A AU2010215353B2 (en) | 2009-02-18 | 2010-02-18 | Method and device for securing documents against forgery |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR09/00742 | 2009-02-18 | ||
FR0900742A FR2942334B1 (fr) | 2009-02-18 | 2009-02-18 | Procede et dispositif de securisation de documents contre la contrefacon |
Publications (2)
Publication Number | Publication Date |
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WO2010094859A2 true WO2010094859A2 (fr) | 2010-08-26 |
WO2010094859A3 WO2010094859A3 (fr) | 2011-03-17 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/FR2010/000136 WO2010094859A2 (fr) | 2009-02-18 | 2010-02-18 | Procede et dispositif de securisation de documents contre la contrefaçon |
Country Status (10)
Country | Link |
---|---|
US (1) | US8736910B2 (fr) |
EP (1) | EP2398652B1 (fr) |
JP (1) | JP2012517921A (fr) |
KR (1) | KR20110124313A (fr) |
CN (1) | CN102405140B (fr) |
AU (1) | AU2010215353B2 (fr) |
BR (1) | BRPI1008450A2 (fr) |
FR (1) | FR2942334B1 (fr) |
RU (1) | RU2011138308A (fr) |
WO (1) | WO2010094859A2 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013154575A1 (fr) | 2012-04-13 | 2013-10-17 | Hewlett-Packard Development Company, L.P. | Impression double face |
FR3018128B1 (fr) * | 2014-03-03 | 2016-03-25 | Advanced Track & Trace | Procede et dispositif de securisation d'un document |
US9871660B2 (en) | 2014-12-23 | 2018-01-16 | Banco De Mexico | Method for certifying and authentifying security documents based on a measure of the relative variations of the different processes involved in its manufacture |
BR112020017923A2 (pt) * | 2018-03-07 | 2020-12-22 | Sotec Consulting Sl | Método e sistema de verificação automática da autenticidade de documentos |
EP4102399A1 (fr) | 2021-06-08 | 2022-12-14 | Université de Genève | Authentification d'objets utilisant des plans numériques et des empreintes physiques |
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FR2904130A1 (fr) | 2006-07-19 | 2008-01-25 | Advanced Track Et Trace Sa | Procedes et dispositifs de securisation et d'authentification de documents |
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CA2435659A1 (fr) * | 2002-07-23 | 2004-01-23 | Kabushiki Kaisha Toshiba | Methode de traitement d'image |
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- 2009-02-18 FR FR0900742A patent/FR2942334B1/fr not_active Expired - Fee Related
-
2010
- 2010-02-18 BR BRPI1008450A patent/BRPI1008450A2/pt not_active IP Right Cessation
- 2010-02-18 RU RU2011138308/12A patent/RU2011138308A/ru not_active Application Discontinuation
- 2010-02-18 WO PCT/FR2010/000136 patent/WO2010094859A2/fr active Application Filing
- 2010-02-18 US US13/202,198 patent/US8736910B2/en active Active
- 2010-02-18 CN CN201080017240.2A patent/CN102405140B/zh not_active Expired - Fee Related
- 2010-02-18 KR KR1020117021792A patent/KR20110124313A/ko not_active Application Discontinuation
- 2010-02-18 JP JP2011550617A patent/JP2012517921A/ja active Pending
- 2010-02-18 EP EP10708242.2A patent/EP2398652B1/fr not_active Not-in-force
- 2010-02-18 AU AU2010215353A patent/AU2010215353B2/en not_active Ceased
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US7286682B1 (en) | 2000-08-31 | 2007-10-23 | Xerox Corporation | Show-through watermarking of duplex printed documents |
CH694233A5 (fr) | 2000-09-20 | 2004-09-30 | Alpvision Sa | Procédé d'application et de reconnaissance d'un filigrane numérique surimprimé. |
WO2006087351A2 (fr) | 2005-02-15 | 2006-08-24 | Alpvision S.A. | Procede permettant d'appliquer une marque invisible sur un support |
FR2904130A1 (fr) | 2006-07-19 | 2008-01-25 | Advanced Track Et Trace Sa | Procedes et dispositifs de securisation et d'authentification de documents |
Also Published As
Publication number | Publication date |
---|---|
CN102405140A (zh) | 2012-04-04 |
US8736910B2 (en) | 2014-05-27 |
EP2398652A2 (fr) | 2011-12-28 |
FR2942334A1 (fr) | 2010-08-20 |
CN102405140B (zh) | 2015-08-19 |
EP2398652B1 (fr) | 2017-03-15 |
KR20110124313A (ko) | 2011-11-16 |
AU2010215353A1 (en) | 2011-10-13 |
JP2012517921A (ja) | 2012-08-09 |
WO2010094859A3 (fr) | 2011-03-17 |
AU2010215353B2 (en) | 2015-07-02 |
FR2942334B1 (fr) | 2011-02-18 |
RU2011138308A (ru) | 2013-11-20 |
US20120033264A1 (en) | 2012-02-09 |
BRPI1008450A2 (pt) | 2016-02-23 |
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