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GB1400374A - Signal spectrum analysis by walsh function and hadamard operators - Google Patents

Signal spectrum analysis by walsh function and hadamard operators

Info

Publication number
GB1400374A
GB1400374A GB1095473A GB1095473A GB1400374A GB 1400374 A GB1400374 A GB 1400374A GB 1095473 A GB1095473 A GB 1095473A GB 1095473 A GB1095473 A GB 1095473A GB 1400374 A GB1400374 A GB 1400374A
Authority
GB
United Kingdom
Prior art keywords
signature
representation
hadamard
store
add
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.)
Expired
Application number
GB1095473A
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.)
Unisys Corp
Original Assignee
Burroughs Corp
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 Burroughs Corp filed Critical Burroughs Corp
Publication of GB1400374A publication Critical patent/GB1400374A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
    • G06F17/145—Square transforms, e.g. Hadamard, Walsh, Haar, Hough, Slant transforms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/40—Extraction of image or video features
    • G06V10/42—Global feature extraction by analysis of the whole pattern, e.g. using frequency domain transformations or autocorrelation
    • G06V10/431—Frequency domain transformation; Autocorrelation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition
    • G06V30/14—Image acquisition
    • G06V30/142—Image acquisition using hand-held instruments; Constructional details of the instruments
    • G06V30/1423—Image acquisition using hand-held instruments; Constructional details of the instruments the instrument generating sequences of position coordinates corresponding to handwriting
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/30—Individual registration on entry or exit not involving the use of a pass
    • G07C9/32—Individual registration on entry or exit not involving the use of a pass in combination with an identity check
    • G07C9/35—Individual registration on entry or exit not involving the use of a pass in combination with an identity check by means of a handwritten signature

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Multimedia (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Computational Mathematics (AREA)
  • Algebra (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Collating Specific Patterns (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Complex Calculations (AREA)
  • Image Analysis (AREA)

Abstract

1400374 Pattern recognition BURROUGHS CORP 6 March 1973 [21 April 1972] 10954/73 Heading G4R A signature is verified by deriving an electrical multi-word digital representation of the signature, performing a Hadamard transformation on the digital representation and comparing the transformed representation with a prerecorded representation of the signature. In Fig. 2, optical or handwriting pressure signals are periodically sampled and converted into a 10 bit parallel binary code 30 and each coded sample is added to or subtracted from the accumulated results obtained from the previous samples which are circulated from the output 40 of an add/subtract circuit 32 through shift registers 36 and a buffer store 38, each sample being operated on 64 times to build up for the complete signature a family of 64 Walsh functions. The Hadamard operators are fed to the add/subtract circuit 32 from a recirculating store 34. The final result is read out from the shift registers 36 to a comparator receiving reference signals from a permanent store or from magnetically recorded data on a credit card.
GB1095473A 1972-08-21 1973-03-06 Signal spectrum analysis by walsh function and hadamard operators Expired GB1400374A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US28241872A 1972-08-21 1972-08-21

Publications (1)

Publication Number Publication Date
GB1400374A true GB1400374A (en) 1975-07-16

Family

ID=23081437

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1095473A Expired GB1400374A (en) 1972-08-21 1973-03-06 Signal spectrum analysis by walsh function and hadamard operators

Country Status (10)

Country Link
JP (1) JPS4987255A (en)
BE (1) BE803237A (en)
BR (1) BR7306381D0 (en)
CA (1) CA1019837A (en)
CH (1) CH576677A5 (en)
DE (1) DE2340110C3 (en)
FR (1) FR2197277B1 (en)
GB (1) GB1400374A (en)
IT (1) IT1003118B (en)
NL (1) NL7310683A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002080A1 (en) * 1979-03-19 1980-10-02 Ncr Co Identity verification apparatus and method
GB2159998A (en) * 1984-06-07 1985-12-11 Rolls Royce Personal handwriting verification
GB2164186A (en) * 1984-09-04 1986-03-12 Stc Plc Signature verification
US5095510A (en) * 1990-02-16 1992-03-10 Rolls-Royce Plc Device and method for verifying personal handwriting

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54122244U (en) * 1978-02-17 1979-08-27

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002080A1 (en) * 1979-03-19 1980-10-02 Ncr Co Identity verification apparatus and method
EP0027451A1 (en) * 1979-03-19 1981-04-29 Ncr Co IDENTITY VERIFICATION APPARATUS AND METHOD.
EP0027451A4 (en) * 1979-03-19 1982-05-26 Ncr Corp IDENTITY VERIFICATION APPARATUS AND METHOD.
GB2159998A (en) * 1984-06-07 1985-12-11 Rolls Royce Personal handwriting verification
US5029219A (en) * 1984-06-07 1991-07-02 Rolls-Royce Plc Personal handwriting verification
GB2164186A (en) * 1984-09-04 1986-03-12 Stc Plc Signature verification
US5095510A (en) * 1990-02-16 1992-03-10 Rolls-Royce Plc Device and method for verifying personal handwriting

Also Published As

Publication number Publication date
FR2197277A1 (en) 1974-03-22
BE803237A (en) 1973-12-03
CH576677A5 (en) 1976-06-15
DE2340110B2 (en) 1980-06-19
AU5894673A (en) 1975-02-06
JPS4987255A (en) 1974-08-21
DE2340110C3 (en) 1981-04-09
CA1019837A (en) 1977-10-25
IT1003118B (en) 1976-06-10
NL7310683A (en) 1974-02-25
FR2197277B1 (en) 1976-09-10
BR7306381D0 (en) 1974-07-25
DE2340110A1 (en) 1974-03-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee