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GB2309781A - Method of authenticating watermarked paper - Google Patents

Method of authenticating watermarked paper

Info

Publication number
GB2309781A
GB2309781A GB9709942A GB9709942A GB2309781A GB 2309781 A GB2309781 A GB 2309781A GB 9709942 A GB9709942 A GB 9709942A GB 9709942 A GB9709942 A GB 9709942A GB 2309781 A GB2309781 A GB 2309781A
Authority
GB
United Kingdom
Prior art keywords
paper
watermark
watermarked
thermal
authenticating
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.)
Granted
Application number
GB9709942A
Other versions
GB2309781B (en
GB9709942D0 (en
Inventor
Marc Ivor John Beale
David Oinn
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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
Priority claimed from GBGB9425232.7A external-priority patent/GB9425232D0/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB9709942A priority Critical patent/GB2309781B/en
Publication of GB9709942D0 publication Critical patent/GB9709942D0/en
Publication of GB2309781A publication Critical patent/GB2309781A/en
Application granted granted Critical
Publication of GB2309781B publication Critical patent/GB2309781B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws
    • 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
    • G07D7/15—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 heating means
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

A method of authenticating watermarked paper comprises the steps of transiently heating a first surface (50) of a watermarked sheet of paper (40) using a hot air source (22); forming a thermal image of the watermark (42) using a thermal imager (30); and analysing the thermal image to determine whether or not the watermarked paper is authentic. The evolution of the thermal image with time is a characteristic of the watermark and is dependent on the local thermal mass of the paper in the region of the watermark.
GB9709942A 1994-12-14 1995-12-07 Method of authenticating watermarked paper Expired - Fee Related GB2309781B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9709942A GB2309781B (en) 1994-12-14 1995-12-07 Method of authenticating watermarked paper

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9425232.7A GB9425232D0 (en) 1994-12-14 1994-12-14 Method of authenticating watermarked paper
PCT/GB1995/002855 WO1996018978A1 (en) 1994-12-14 1995-12-07 Method of authenticating watermarked paper
GB9709942A GB2309781B (en) 1994-12-14 1995-12-07 Method of authenticating watermarked paper

Publications (3)

Publication Number Publication Date
GB9709942D0 GB9709942D0 (en) 1997-07-09
GB2309781A true GB2309781A (en) 1997-08-06
GB2309781B GB2309781B (en) 1998-11-11

Family

ID=26306171

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9709942A Expired - Fee Related GB2309781B (en) 1994-12-14 1995-12-07 Method of authenticating watermarked paper

Country Status (1)

Country Link
GB (1) GB2309781B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6766045B2 (en) 2002-03-11 2004-07-20 Digital Verification Ltd. Currency verification

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4296326A (en) * 1979-03-06 1981-10-20 Thomas De La Rue & Company Limited Watermark detection
GB2168494A (en) * 1984-12-18 1986-06-18 Gilbert Mciver Stevenson Method and apparatus for non- destructively testing for discontinuities between a coating and a substrate
US4608598A (en) * 1983-06-29 1986-08-26 Fujitsu Limited Thermal imaging apparatus
WO1987000632A1 (en) * 1985-07-15 1987-01-29 Kanor A/S Method and apparatus for the characterization and control of substances, materials and objects
EP0348742A2 (en) * 1988-06-30 1990-01-03 Nkk Corporation Method for detecting thinned out portion of inner surface or outer surface of pipe
WO1990008311A1 (en) * 1989-01-13 1990-07-26 Iowa State University Research Foundation, Inc. Apparatus and method for transient thermal infrared emission spectrometry
EP0381550A1 (en) * 1989-01-23 1990-08-08 Arjo Wiggins S.A. Fast apparatus and method for recognizing water marks by electromagnetic rays
GB2264779A (en) * 1992-02-20 1993-09-08 Thermoteknix Systems Ltd Monitoring changes in image characteristics.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4296326A (en) * 1979-03-06 1981-10-20 Thomas De La Rue & Company Limited Watermark detection
US4608598A (en) * 1983-06-29 1986-08-26 Fujitsu Limited Thermal imaging apparatus
GB2168494A (en) * 1984-12-18 1986-06-18 Gilbert Mciver Stevenson Method and apparatus for non- destructively testing for discontinuities between a coating and a substrate
WO1987000632A1 (en) * 1985-07-15 1987-01-29 Kanor A/S Method and apparatus for the characterization and control of substances, materials and objects
EP0348742A2 (en) * 1988-06-30 1990-01-03 Nkk Corporation Method for detecting thinned out portion of inner surface or outer surface of pipe
WO1990008311A1 (en) * 1989-01-13 1990-07-26 Iowa State University Research Foundation, Inc. Apparatus and method for transient thermal infrared emission spectrometry
EP0381550A1 (en) * 1989-01-23 1990-08-08 Arjo Wiggins S.A. Fast apparatus and method for recognizing water marks by electromagnetic rays
GB2264779A (en) * 1992-02-20 1993-09-08 Thermoteknix Systems Ltd Monitoring changes in image characteristics.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6766045B2 (en) 2002-03-11 2004-07-20 Digital Verification Ltd. Currency verification

Also Published As

Publication number Publication date
GB2309781B (en) 1998-11-11
GB9709942D0 (en) 1997-07-09

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20011207