GB2267357A - Compact, hand-held reader for evaluating optical diffractive information - Google Patents

Compact, hand-held reader for evaluating optical diffractive information Download PDF

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Publication number
GB2267357A
GB2267357A GB9210272A GB9210272A GB2267357A GB 2267357 A GB2267357 A GB 2267357A GB 9210272 A GB9210272 A GB 9210272A GB 9210272 A GB9210272 A GB 9210272A GB 2267357 A GB2267357 A GB 2267357A
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GB
United Kingdom
Prior art keywords
information
optical reader
compact
compact optical
evaluated
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.)
Withdrawn
Application number
GB9210272A
Other versions
GB9210272D0 (en
Inventor
Peter Harold Lawrence Woodd
Patrick Francis Flynn
David Charles Hamson
Kevin James Baumber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELEF PLC
Original Assignee
ELEF PLC
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 ELEF PLC filed Critical ELEF PLC
Priority to GB9210272A priority Critical patent/GB2267357A/en
Publication of GB9210272D0 publication Critical patent/GB9210272D0/en
Publication of GB2267357A publication Critical patent/GB2267357A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G07D7/121—Apparatus characterised by sensor details
    • 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
    • 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
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10881—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices constructional details of hand-held scanners
    • 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
    • G07D7/0032—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 holograms
    • 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
    • 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
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2249—Holobject properties
    • 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
    • G03H2001/0016—Covert holograms or holobjects requiring additional knowledge to be perceived, e.g. holobject reconstructed only under IR illumination
    • 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
    • G03H2001/0016—Covert holograms or holobjects requiring additional knowledge to be perceived, e.g. holobject reconstructed only under IR illumination
    • G03H2001/0022—Deciphering being performed with numerical or optical key, e.g. with the optical scrambler used during recording
    • 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
    • G03H2001/0066—Adaptation of holography to specific applications for wavefront matching wherein the hologram is arranged to convert a predetermined wavefront into a comprehensive wave, e.g. associative memory
    • 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
    • G03H2001/0083—Adaptation of holography to specific applications for restoring distorted objects, e.g. restoring objects through scattering media
    • 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
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G03H2001/2213—Diffusing screen revealing the real holobject, e.g. container filed with gel to reveal the 3D holobject
    • 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
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G03H2001/2213—Diffusing screen revealing the real holobject, e.g. container filed with gel to reveal the 3D holobject
    • G03H2001/2215—Plane screen
    • G03H2001/2218—Plane screen being perpendicular to optical axis
    • 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
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H2001/2605—Arrangement of the sub-holograms, e.g. partial overlapping
    • G03H2001/261—Arrangement of the sub-holograms, e.g. partial overlapping in optical contact
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2210/00—Object characteristics
    • G03H2210/20—2D object
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/16—Optical waveguide, e.g. optical fibre, rod
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2227/00—Mechanical components or mechanical aspects not otherwise provided for
    • G03H2227/02—Handheld portable device, e.g. holographic camera, mobile holographic display
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2227/00—Mechanical components or mechanical aspects not otherwise provided for
    • G03H2227/05—Support holding the holographic record
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2207/00—Other aspects
    • G06K2207/1015—Hologram

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  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Security & Cryptography (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Holo Graphy (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

A compact, hand-held, portable reader in the form of a pen-like body 1 for reading and presenting to an operator for evaluation encoded information recorded and encoded within a single optical diffractive element or a plurality of such elements, preferably a hologram(s) H, bonded to or integrated with the particular control device to be evaluated, for the purpose of authenticating or validating e.g. passports, seals, credit cards, cheques, currency, negotiable securities, tickets and security passes, comprises a laser diode 2, lens systems 5, 10, 13, optic fibre bundle 11, optical decoder 12 e.g. a hologram. and imaging screen 14. <IMAGE>

Description

COMPACT OPTICAL READER FOR EVALUATING ENCODED INFORMATION This invention relates to a compact, hand-held device for reading and evaluating encoded information.
The requirements of modern commerce have made necessary the multiplication and diversity of control methods such as cards for the operation of cash dispensers, door and safelocks, authentication of credit cards, passports and air tickets and other purposes described below.
In particular, light diffracting microstructure devices, such as diffraction gratings, kinoforms, kinograms and holograms, when bonded to or integrated with such cards or materials mentioned above, afford such materials an increased level of security by way of their resistance to forgery. The prior art, for example, EP 77464, EP 420261 describes such optical diffractive devices containing machine readable information and the devices for reading them, for example EP 77917, DE 2747156, GB 1561812, DE 2508889, DE 3840037.
This multiplication of such control devices has itself given rise to ever- increasing forgery of them and the object of the present invention is to provide a method of improved convenience for monitoring the control devices in order to evaluate them and determine their authenticity.
According to the present invention there is provided a portable, handheld compact reader capable of reading encoded information recorded and encoded within a single optical diffractive element or a plurality of such elements, preferably a hologram or holograms, bonded to or integrated with the particular control device to be evaluated. There is provided within the present invention a novel method which improves the compactness of such readers as described in the prior art so as to allow the device to be held in the hand like a pen or wand, thus affording the device improved ease of use by the operator.
The encoded information to be evaluated is invisible or covert until rendered visible to the operator by the present invention. The encoded information may be further encyphered by optically modulating or optically scrambling it at the recording or encoding stage. There is provided within the present invention an optical decoder for decyphering such information, thus affording suitably encoded information, the added protection and security of being unique to the reader device.
The present invention is exemplified in the accompanying drawing, which shows a prototype apparatus in the form of an optical reader for checking the presence or absence of security encoded information in an optical diffractive device, exemplified here by hologram H which is provided on a carrier 8, which carrier for example could be in the form of a credit card.
The reader comprises a housing 1 shaped like a pen or small torch, enclosing a laser diode 2 powered by power supply 3 in the form of rechargeable batteries or an external source (not shown).
When switched on by pushbutton switch 4 radiation is emitted from the laser 2 and is modulated by lens system 5 to emerge through aperture 7 which is positioned over the hologram H so that the radiation following beam path 6 is allowed to impinge on hologram H.
A sensor and indicator system (not shown) may be arranged within the reader to confirm correct location of the hologram H relative to beam path 6.
The diffracted laser radiation 9 emerging from hologram H is modulated by lens system 10 and is caused to fall onto the surface of the coherent optical fibre bundle 11. The radiation travels along the fibre bundle 11 to emerge before the optical decoder 12. The decoded radiation emerges from the decoder 12 and is further modulated by lens system 13 which causes a focussed image to appear on the imaging screen 14. The operator is then able to evaluate the decoded information presented on the screen.
The imaging screen is preferentially a clear glass or plastic diffuser which may be coloured or coated with anti-reflection layers to enhance the contrast of the image.
The optical decoder is preferably a hologram, but may be some other optical device for modulating radiation. The optical decoder 12 is interchangeable with other similar optical decoders, which differ only in their recognition of certain patterns of modulated radiation. Each optical decoder corresponds uniquely to an encyphered and encoded optical diffractive element represented here by hologram H.
The coherent optical fibre bundle 11 comprises a tube, which may be flexible, housing a multitude of parallel alike glass fibres of fixed length with polished faces at each end. The fibres may be fused together forming a continuous glass medium. In a more basic form the coherent optial fibre bundle may be replaced by a pre-distorted glass or plastic rod displaying similar but usually inferior characteristics to the coherent optical fibre bundle.

Claims (11)

1 A compact, hand-held, portable device in the form of a pen-like body capable of reading and presenting to the operator encoded information recorded and encoded within a single optical diffractive element or a plurality of such elements, preferably a hologram or holograms, bonded to or integrated with the particular control device to be evaluated5 for the purpose of authenticating or validating items of value including passports, seals, credit cards, cheques, currency, negotiable securities, tickets and other valuable documents as well as control systems including security passes.
2 A compact optical reader as claimed in Claim 1, wherein its unique compactness is achieved by the novel method of employing a flexible coherent optical fibre bundle to transfer the radiation containing the information to be evaluated.
3 A compact optical reader as claimed in Claim 1, wherein its unique compactness is achieved alternatively to the claim in Claim 2, by the novel method of employing a rigid coherent optical fibre bundle to transfer the radiation containing the information to be evaluated.
4 A compact optical reader as claimed in Claim 1, wherein its unique compactness is achieved alternatively to the claim in Claim 3, by the novel method of employing a flexible glass or plastic rod to transfer the radiation containing the information to be evaluated.
5 A compact optical reader as claimed in Claim 1, wherein its unique compactness is achieved alternatively to the claim in Claim 4, by the novel method of employing a rigid glass or plastic rod to transfer the radiation containing the information to be evaluated.
6 A compact optical reader as claimed in any preceding Claim, wherein the information to be evaluated is presented to the operator by means of a viewing screen coloured to enhance the contrast of the image.
7 A compact optical reader as claimed in Claim 6, wherein the information to be evaluated is presented to the operator by means of a viewing screen coated with anti-reflection materials to enhance the contrast of the image.
8 A compact optical reader as claimed in any preceding Claim5 which reads and decodes information holographically encoded.
9 A compact optical reader as claimed in Claim 8, wherein means of power supply is provided by rechargeable batteries contained within the device.
1 0 A compact optical reader as claimed in Claim 9, wherein means of coherent electromagnetic radiation is provided by a compact laser diode.
11 A compact optical reader substantially as described herein with reference to the accompanying drawing.
GB9210272A 1992-05-13 1992-05-13 Compact, hand-held reader for evaluating optical diffractive information Withdrawn GB2267357A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9210272A GB2267357A (en) 1992-05-13 1992-05-13 Compact, hand-held reader for evaluating optical diffractive information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9210272A GB2267357A (en) 1992-05-13 1992-05-13 Compact, hand-held reader for evaluating optical diffractive information

Publications (2)

Publication Number Publication Date
GB9210272D0 GB9210272D0 (en) 1992-07-01
GB2267357A true GB2267357A (en) 1993-12-01

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1041457A2 (en) * 1999-03-31 2000-10-04 Shiseido Company Limited Special image reproducing and observing device
WO2002059840A2 (en) * 2001-01-26 2002-08-01 Wolfgang Heitsch Information device with accessory device and test method
EP1170707A3 (en) * 2000-07-03 2002-11-06 BUNDESDRUCKEREI GmbH Portable sensor for validating marks on documents
DE10116066A1 (en) * 2001-04-03 2002-11-14 Eml Europ Media Lab Gmbh Identifying objects using hologram involves acquiring image of person, generating holographic information in computer from image, encoding, applying to optical storage medium
WO2005100926A1 (en) * 2004-04-19 2005-10-27 Giesecke & Devrient Gmbh Device for checking banknotes
WO2006002552A1 (en) * 2004-06-30 2006-01-12 Kxo Ag Anti-counterfeit security object and methods for its production and verification
WO2014037575A1 (en) * 2012-09-10 2014-03-13 Universite Libre De Bruxelles Method for recording gabor hologram

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1541918A (en) * 1975-01-16 1979-03-14 Siemens Ag Checking devices for identity cards
GB2248943A (en) * 1990-10-11 1992-04-22 Light Fantastic Plc Improved device for reading and evaluating encoded information

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1541918A (en) * 1975-01-16 1979-03-14 Siemens Ag Checking devices for identity cards
GB2248943A (en) * 1990-10-11 1992-04-22 Light Fantastic Plc Improved device for reading and evaluating encoded information

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Applied Optics, Vol. 31, No. 8, 10 March 1992, pages 1048-1052. *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1041457A2 (en) * 1999-03-31 2000-10-04 Shiseido Company Limited Special image reproducing and observing device
EP1041457A3 (en) * 1999-03-31 2003-07-30 Shiseido Company Limited Special image reproducing and observing device
US6784441B2 (en) 2000-07-03 2004-08-31 Bundesdruckerei Gmbh Handsensor for authenticity identification of signets on documents
EP1170707A3 (en) * 2000-07-03 2002-11-06 BUNDESDRUCKEREI GmbH Portable sensor for validating marks on documents
WO2002059840A2 (en) * 2001-01-26 2002-08-01 Wolfgang Heitsch Information device with accessory device and test method
WO2002059840A3 (en) * 2001-01-26 2003-12-31 Wolfgang Heitsch Information device with accessory device and test method
DE10116066A1 (en) * 2001-04-03 2002-11-14 Eml Europ Media Lab Gmbh Identifying objects using hologram involves acquiring image of person, generating holographic information in computer from image, encoding, applying to optical storage medium
DE10116066B4 (en) * 2001-04-03 2006-05-11 Tesa Scribos Gmbh A method of marking objects with a hologram and articles characterized by such a method
WO2005100926A1 (en) * 2004-04-19 2005-10-27 Giesecke & Devrient Gmbh Device for checking banknotes
WO2006002552A1 (en) * 2004-06-30 2006-01-12 Kxo Ag Anti-counterfeit security object and methods for its production and verification
US8081359B2 (en) 2004-06-30 2011-12-20 Kxo Ag Anti-counterfeit security and methods for its production and verification
WO2014037575A1 (en) * 2012-09-10 2014-03-13 Universite Libre De Bruxelles Method for recording gabor hologram
CN104937499A (en) * 2012-09-10 2015-09-23 布鲁塞尔自由大学 Method for recording gabor hologram
US9599959B2 (en) 2012-09-10 2017-03-21 Universite Libre De Bruxelles Method for recording gabor hologram

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Publication number Publication date
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