CA1019837A - Signal spectrum analysis by walsh function and hadamard operations - Google Patents

Signal spectrum analysis by walsh function and hadamard operations

Info

Publication number
CA1019837A
CA1019837A CA177,568A CA177568A CA1019837A CA 1019837 A CA1019837 A CA 1019837A CA 177568 A CA177568 A CA 177568A CA 1019837 A CA1019837 A CA 1019837A
Authority
CA
Canada
Prior art keywords
spectrum analysis
signal spectrum
walsh function
hadamard
operations
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
CA177,568A
Other languages
English (en)
French (fr)
Other versions
CA177568S (en
Inventor
Arthur J. Radcliffe (Jr.)
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
Application granted granted Critical
Publication of CA1019837A publication Critical patent/CA1019837A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; 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 OR CALCULATING; 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)
  • Multimedia (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Mathematical Analysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Databases & Information Systems (AREA)
  • Algebra (AREA)
  • Collating Specific Patterns (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Complex Calculations (AREA)
  • Image Analysis (AREA)
CA177,568A 1972-08-21 1973-07-30 Signal spectrum analysis by walsh function and hadamard operations Expired CA1019837A (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
CA1019837A true CA1019837A (en) 1977-10-25

Family

ID=23081437

Family Applications (1)

Application Number Title Priority Date Filing Date
CA177,568A Expired CA1019837A (en) 1972-08-21 1973-07-30 Signal spectrum analysis by walsh function and hadamard operations

Country Status (10)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54122244U (enrdf_load_stackoverflow) * 1978-02-17 1979-08-27
US4308522A (en) * 1979-03-19 1981-12-29 Ncr Corporation Identity verification apparatus and method
GB2159998B (en) * 1984-06-07 1988-02-17 Rolls Royce Personal handwriting verification
GB2164186A (en) * 1984-09-04 1986-03-12 Stc Plc Signature verification
DE69021547T2 (de) * 1990-02-16 1996-01-18 Rolls Royce Plc Vorrichtung und Verfahren zum Feststellen der Echtheit der Handschrift einer Person.

Also Published As

Publication number Publication date
AU5894673A (en) 1975-02-06
JPS4987255A (enrdf_load_stackoverflow) 1974-08-21
BR7306381D0 (pt) 1974-07-25
DE2340110A1 (de) 1974-03-07
DE2340110B2 (de) 1980-06-19
IT1003118B (it) 1976-06-10
NL7310683A (enrdf_load_stackoverflow) 1974-02-25
GB1400374A (en) 1975-07-16
FR2197277A1 (enrdf_load_stackoverflow) 1974-03-22
BE803237A (fr) 1973-12-03
FR2197277B1 (enrdf_load_stackoverflow) 1976-09-10
CH576677A5 (enrdf_load_stackoverflow) 1976-06-15
DE2340110C3 (de) 1981-04-09

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