WO2004107043A1 - Procede de reproduction d'une matrice holographique sur un support et support - Google Patents

Procede de reproduction d'une matrice holographique sur un support et support Download PDF

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Publication number
WO2004107043A1
WO2004107043A1 PCT/IT2003/000330 IT0300330W WO2004107043A1 WO 2004107043 A1 WO2004107043 A1 WO 2004107043A1 IT 0300330 W IT0300330 W IT 0300330W WO 2004107043 A1 WO2004107043 A1 WO 2004107043A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
matrix
holographic
holographic matrix
imprinted
Prior art date
Application number
PCT/IT2003/000330
Other languages
English (en)
Inventor
Pietro Pagani
Original Assignee
Secure Globe S.A.
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 Secure Globe S.A. filed Critical Secure Globe S.A.
Priority to PCT/IT2003/000330 priority Critical patent/WO2004107043A1/fr
Priority to AU2003241162A priority patent/AU2003241162A1/en
Publication of WO2004107043A1 publication Critical patent/WO2004107043A1/fr

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
    • G03H1/0891—Processes or apparatus adapted to convert digital holographic data into a hologram
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/18—Particular processing of hologram record carriers, e.g. for obtaining blazed holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/30—Hardeners
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C2200/00—Details
    • G03C2200/38—Lippmann (fine grain) emulsion
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/40—Chemically transforming developed images
    • G03C5/44—Bleaching; Bleach-fixing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/18—Particular processing of hologram record carriers, e.g. for obtaining blazed holograms
    • G03H1/182—Post-exposure processing, e.g. latensification
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0476—Holographic printer
    • G03H2001/048—Parallel printer, i.e. a fringe pattern is reproduced

Definitions

  • a subject of the present invention is a method for reproducing on a support a holographic matrix.
  • a further subject of the present invention is the support on which said holographic matrix is reproduced.
  • the known optical receivers are sensitive solely to the intensity of the waves received. These do not reveal the phase relations between one point and another, so that the information carried by a wave is in part dispersed when such a wave strikes said optical receivers.
  • the interference on which the holographic phenomenon is based generates interference fringes which, instead, also contain the information relative to the phase relations and make it possible to reconstruct the original wave front in its entirety.
  • the interference fringes are recorded on a photographic plate having a very high resolution power and sensitive to the wavelength of the coherent light used to obtain such fringes, defined as a holographic plate.
  • Each point of the interference fringes contains sufficient information to reconstruct the entire image of the holographed object.
  • part of the holographic plate is cut away, removing part of the interference figures recorded thereon, by impinging on the remaining fringes the entire image of the holographed object is likewise obtained.
  • Many applications of conventional holography are known, among which are those concerning the field of fraud prevention, security and data protection.
  • the holographic matrix is a dot matrix, in which it is possible, for example, to associate the binary number 0 with the non-blackened element of the matrix, and the binary number 1 to the blackened element of the matrix, or vice versa.
  • a support for example a film, which acts as a holographic plate.
  • the problem underlying the present invention is that of devising a method for reproducing on a support a holographic matrix and a support on which said matrix is imprinte .
  • the image is acquired by a computer by means of a scanner device which makes it possible to create, through the use of suitable scanner management software, an image file, characterized by a desired resolution, for example a resolution of 72 dots/sq.in.
  • the image is acquired by means of video cameras and the like.
  • the image acquired is modified by the use of image management software, obtaining a file containing a low resolution image.
  • image files are used which have different resolutions, for example equal to 72 or 96 or 300 dots/in.
  • Said image files are for example of the jpeg, bitmap, tiff type or in vector form.
  • the file containing the low resolution image is manipulated by software, termed simulation software, suitable for obtaining a . holographic matrix corresponding to the image acquired.
  • the simulation software simulates the holographic phenomenon, generating, from the file of the low resolution image, a digital matrix which represents the holographic matrix of the image acquired.
  • said simulation software in order to generate said holographic matrix, utilizes the principles of the Fourier and/or Fresnel transform.
  • the file containing the holographic matrix is transformed by software into a high resolution file.
  • the file containing the holographic matrix is manipulated by software suitable for obtaining a resolution greater than the resolution of the image acquired to start with.
  • said high resolution file contains said digital holographic matrix, or an ordered assembly of binary elements representable as an assembly of black and white elements, with a minimum definition of 3600 x 3600 dots/in.
  • the laser photo-unit comprises an apparatus provided with a laser diode which, by means of pulses, is capable of sensitizing a photographic film.
  • said laser photo-unit comprises a helio-neon or argon laser diode having a 4.0 nm laser spot.
  • said laser photo-unit has a resolution of 3600 x 3600 dots/in.
  • said laser photo-unit has a resolution greater than 3600 x 3600 dots/in.
  • a photographic film is used in the laser photo- unit for reproducing said digital holographic matrix on said film. Said photographic film is a high resolution film.
  • said film has a fine granulometry and a resolution power equal to 5/10000 lines/mm.
  • the high resolution photographic film is chemically treated, preferably with a photosensitive emulsion based on silver bromide.
  • the laser photo-unit exposes the high resolution photographic film, transferring onto said photographic film the so-called holographic digital matrix, by means of a process of chemical sensitization of the emulsion present on the film, which reacts to the wavelength of the laser diode .
  • said digital holographic matrix comparable to an assembly of elements present on the sensitive film, which elements will subsequently be blackened or rendered transparent, and are disposed in a well defined sequence and arrangement, and which assembly is capable of simulating the holographic interference fringes, is transferred onto the high resolution photographic film.
  • Said developing process is carried out on an apparatus which uses at least two chemical compounds, in professional jargon defined as “developer” and “fixer”.
  • the holographic digital matrix transferred onto the high resolution film simulates the holographic interference fringes .
  • Said film in fact, impinged upon by a coherent light, generates, for example on a wall, either by reflection or by transmission, a holographic image.
  • the characteristic properties of holography are fulfilled by said image.
  • the photographic film impinged upon by the light of a laser, generates on a wall an image which is identical to the image acquired by the computer, except for the colours.
  • the image By moving the photographic film the image remains stationary on the wall, or does not exhibit a corresponding displacement. In other words, the holographic image is projected onto the wall independently of the dot or of the assembly of dots impinged upon by the coherent light. [0053] By cutting the photographic film at the exposed holographic matrix and by impinging upon the residual portion of matrix with the coherent light beam, the image continues to form on the wall .
  • the image formed on the wall is three- dimensional .
  • the developed positive exhibits the same characteristics as the negative.
  • the experiments that can be conducted on the exposed photographic film highlight the fact that the image which forms is a holographic image.
  • the holographic matrix imprinted on the high resolution photographic film is in the form of an assembly of dots.
  • the holographic matrix appears effectively as an assembly of blackened or transparent elements, according to a specific arrangement .
  • a procedure makes it possible to render this assembly invisible, in particular invisible under the electron microscope and non-reproducible.
  • the high resolution photographic film is subjected to a procedure capable of rendering the dots of the imprinted matrix invisible.
  • the procedure termed "bleaching", must be carried out without applying any structural modification to the arrangement of the dots of the holographic matrix on the photographic film.
  • Such arrangement does in fact correspond to a specific image and the modification thereof involves the reproduction of an interference flow which generates a disturbance not coinciding with the original desired image .
  • the bleaching procedure comprises oxidation of the particles present on the photographic film, generally corresponding to silver particles .
  • said oxidation is carried out using chromic acid, immersing the film for a period of time in a solution of said acid at a specific temperature.
  • Said film is then immersed in a further solution of an acid, for a specific period of time at a specific temperature.
  • said further solution contains sulphuric acid.
  • the result consists of a film apparently transparent to the naked eye and to electron microscope analysis, but in reality still containing the distribution of dots which constitutes the holographic matrix.
  • This image also represents a hologram and has the properties mentioned initially.
  • the method provides for the deposition of security pigments on the support.
  • Said security pigments are invisible but verifiable with suitable instrumentation.
  • said method provides for depositing fluorescents that can be verified by ultraviolet light, non-actinics that can be verified by infrared light, phosphors that can be excited with a laser source in the invisible spectrum, biochemical compounds and molecules, titanium oxide pigments and so-called O.V.I.s (Optical Variable Interference) , or agents which change colour depending on the angle at which they are observed.
  • said procedure makes it possible to obtain a digital holographic matrix imprinted on a photographic film which is invisible to the naked eye or to inspection apparatus such as an electron microscope.
  • the aforesaid method is capable of producing anti-counterfeiting or security means.
  • said method is suitable for being used to produce means for certification of the origin, the provenance, the method of production and the like for a product .
  • said method is suitable for producing means for identity certification, for example in identity cards, passports, magnetic cards such as credit cards, cards for access to reserved areas and the like.
  • the holographic matrix is imprinted on a photographic film which is then bleached and inserted into a passport or an identity card or into a credit card.
  • the photographic film containing the holographic matrix is inserted on the thermoadhesive plastic substrate of a badge, in the form of a square that can be detected on the surface of said badge.
  • said film is inserted on the thermoadhesive plastic substrate of a badge, in the form of a continuous line that can be detected on the surface thereof.
  • said method makes it possible to obtain a holographic matrix on labels, visible or invisible portions of a product and the like, for the purpose of checking and certifying the originality thereof.
  • said film is inserted on the papery substrate or adhesive plastic of a sticky label, in the form of a continuous stripe that can be detected on the surface of the label, or in such a manner as to cover the entire label .
  • the aforesaid method makes it possible to obtain plastics threads on which the holographic matrix is imprinted and which are capable of being inserted into banknotes .
  • said thread is inserted on the papery security substrate passing through the fibres of the banknote.
  • said method makes it possible to obtain a holographic matrix, bleached if required, on lenses for spectacles.
  • the recognition of the origin of the product or of the originality of a document can be effected by means of a device comprising a coherent light source, capable of impinging upon the photographic film or the support on which the holographic matrix has been imprinted and obtaining the holographic image.
  • Said image should exhibit the properties of the hologram.
  • the device is suitable for reproducing the holographic image by reflection or by transmission.
  • the holographic image is imprinted on an opaque support, being suitable for producing a holographic image by reflection.
  • holographic image is visible by means of an instrument termed a "holoscope", which uses a source of natural and non-coherent light.
  • holoscope which uses a source of natural and non-coherent light.
  • the light rays emitted by a natural light source are concentrated, by means of mirrors or lenses, and passed through a small hole.
  • Said hole has dimensions suitable for causing a light beam to emerge which has a wavelength that is substantially constant and coherent in space even if the light source is dot-like or diffuse in nature.
  • the coherent beam thus obtained impinges upon the film containing the holographic matrix, permitting the detection of the holographic image, in its original colours and its three-dimensionality.
  • Said image for confirming the originality of the document, retrieves for example the image itself of the document, if necessary reproducing the serial number, photo, name and surname of the holder, logo of the producer, a code which makes it possible to obtain a comparative analysis with the original, and the like.
  • the method according to the invention reproduces a digital holographic matrix on a support such as to be suitable for use as an anti-counterfeiting or security device.
  • the holographic matrix obtained from the low resolution image is manipulated by software suitable for obtaining a high resolution.
  • Said high resolution is suitable for producing, when said matrix is imprinted on the support, interference phenomena on which the holographic phenomenon is based.
  • the method according to the invention makes it possible to imprint said matrix on said support clearly and precisely, or maintaining unchanged the positions and arrangements of the dots of which it is composed when imprinted on the support .
  • said method makes it possible to obtain developing in which the contours of the agents deposited on the support are clear and well defined, or devoid of smudges which would compromise the occurrence of the interference phenomena on which the holographic phenomenon is based.
  • the matrix imprinted on said support is reproducible with conventional printing means, such as offset printing, rotogravure and further techniques suitable for maintaining unchanged the dimensional and positioning characteristics of the dots.
  • Said reproduction can be carried out on supports suitable for receiving the printing process with a high surface energy, for example at least equal to 90 dynes/cm2.
  • varnishes and inks are suitable for providing information detectable by ultraviolet or infrared light and the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Credit Cards Or The Like (AREA)
  • Holo Graphy (AREA)

Abstract

L'invention concerne un procédé destiné à reproduire, sur un support, une matrice holographique numérique, et consistant à obtenir ladite matrice par application d'un logiciel de simulation à une image haute résolution, à exposer ce support par reproduction de la matrice holographique, à développer la matrice imprimée sur le support, et à réaliser une opération de blanchiment permettant de rendre transparente la matrice holographique imprimée sur ce support. Ledit support, tel qu'une pellicule photographique, peut être inséré dans des documents d'identité, des passeports, des cartes de crédit, des cartes d'accès, etc. sous la forme d'une unité anti-contrefaçon ou anti-fraude ou d'une unité destinée à certifier une identité ou un produit.
PCT/IT2003/000330 2003-05-29 2003-05-29 Procede de reproduction d'une matrice holographique sur un support et support WO2004107043A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IT2003/000330 WO2004107043A1 (fr) 2003-05-29 2003-05-29 Procede de reproduction d'une matrice holographique sur un support et support
AU2003241162A AU2003241162A1 (en) 2003-05-29 2003-05-29 Method for reproducing a holographic matrix on a support and support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2003/000330 WO2004107043A1 (fr) 2003-05-29 2003-05-29 Procede de reproduction d'une matrice holographique sur un support et support

Publications (1)

Publication Number Publication Date
WO2004107043A1 true WO2004107043A1 (fr) 2004-12-09

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PCT/IT2003/000330 WO2004107043A1 (fr) 2003-05-29 2003-05-29 Procede de reproduction d'une matrice holographique sur un support et support

Country Status (2)

Country Link
AU (1) AU2003241162A1 (fr)
WO (1) WO2004107043A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103072390A (zh) * 2012-12-13 2013-05-01 浙江科技学院 数字全息防伪印章的制作与识别方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894756A (en) * 1971-10-18 1975-07-15 Optronics Int Identification card having a reference beam coded hologram
US4187106A (en) * 1979-03-23 1980-02-05 The United States Of America As Represented By The Secretary Of The Army Process for making phase holograms
US5138471A (en) * 1990-07-20 1992-08-11 Mcgrew Stephen P Holocomposer
WO1995012149A1 (fr) * 1993-10-25 1995-05-04 Dimensional Arts, Inc. Systeme de production d'un hologramme
EP1146477A1 (fr) * 2000-04-11 2001-10-17 McGrew, Stephen P. Méthode et dispositif pour lire et vérifier des hologrammes
WO2002050761A1 (fr) * 2000-12-21 2002-06-27 Digimarc Corporation Hologrammes a filigrane numerique
WO2003023723A1 (fr) * 2001-09-10 2003-03-20 Mantegazza Antonio Arti Grafiche S.R.L. Document et procede permettant de lutter contre la contrefaçon et la production de faux

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894756A (en) * 1971-10-18 1975-07-15 Optronics Int Identification card having a reference beam coded hologram
US4187106A (en) * 1979-03-23 1980-02-05 The United States Of America As Represented By The Secretary Of The Army Process for making phase holograms
US5138471A (en) * 1990-07-20 1992-08-11 Mcgrew Stephen P Holocomposer
WO1995012149A1 (fr) * 1993-10-25 1995-05-04 Dimensional Arts, Inc. Systeme de production d'un hologramme
EP1146477A1 (fr) * 2000-04-11 2001-10-17 McGrew, Stephen P. Méthode et dispositif pour lire et vérifier des hologrammes
WO2002050761A1 (fr) * 2000-12-21 2002-06-27 Digimarc Corporation Hologrammes a filigrane numerique
WO2003023723A1 (fr) * 2001-09-10 2003-03-20 Mantegazza Antonio Arti Grafiche S.R.L. Document et procede permettant de lutter contre la contrefaçon et la production de faux

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
S. J. ZACHAROVAS, A. M. RODIN, D. B. RATCLIFFE, S. P. VOROBIOV: "Recent advances in Holographic Materials Chemical Processing from Geola", 2000 INTERNATIONAL SYMPOSIUM ON SILVER HALIDE TECHNOLOGY, ST. ADELE, QUEBEC, CANADA, 11-14. SEPTEMBER 2000, 2000, SPRINGFIELD, VA, US, pages 281 - 284, XP002278427 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103072390A (zh) * 2012-12-13 2013-05-01 浙江科技学院 数字全息防伪印章的制作与识别方法

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