GB1524376A - Detection system - Google Patents

Detection system

Info

Publication number
GB1524376A
GB1524376A GB42984/75A GB4298475A GB1524376A GB 1524376 A GB1524376 A GB 1524376A GB 42984/75 A GB42984/75 A GB 42984/75A GB 4298475 A GB4298475 A GB 4298475A GB 1524376 A GB1524376 A GB 1524376A
Authority
GB
United Kingdom
Prior art keywords
signal
inverted
differentiated
output
inverted signal
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
GB42984/75A
Other languages
English (en)
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.)
Xerox Corp
Original Assignee
Xerox 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 Xerox Corp filed Critical Xerox Corp
Publication of GB1524376A publication Critical patent/GB1524376A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original
    • 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
    • G06V30/16—Image preprocessing
    • G06V30/162—Quantising the image signal
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Character Input (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Length Measuring Devices By Optical Means (AREA)
GB42984/75A 1975-01-22 1975-10-20 Detection system Expired GB1524376A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/543,024 US3987413A (en) 1975-01-22 1975-01-22 Detection system

Publications (1)

Publication Number Publication Date
GB1524376A true GB1524376A (en) 1978-09-13

Family

ID=24166275

Family Applications (1)

Application Number Title Priority Date Filing Date
GB42984/75A Expired GB1524376A (en) 1975-01-22 1975-10-20 Detection system

Country Status (7)

Country Link
US (1) US3987413A (enExample)
JP (1) JPS5197940A (enExample)
DE (1) DE2553077A1 (enExample)
FR (1) FR2298833A1 (enExample)
GB (1) GB1524376A (enExample)
NL (1) NL7514285A (enExample)
SE (1) SE7514702L (enExample)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2837139C3 (de) * 1978-08-25 1982-02-25 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Verfahren und Schaltungsanordnung zur Impulsaufsteilung
FR2437125A1 (fr) * 1978-09-21 1980-04-18 Cit Alcatel Dispositif de traitement d'un signal d'analyse d'image
US4398221A (en) * 1980-09-01 1983-08-09 Ricoh Company, Ltd. Facsimile apparatus
US4525747A (en) * 1981-08-06 1985-06-25 Toshiyuki Sakai Analog-to-digital image signal conversion
JPH0719275B2 (ja) * 1986-07-08 1995-03-06 住友電気工業株式会社 二値化回路
JP2724006B2 (ja) * 1989-11-16 1998-03-09 オリンパス光学工業株式会社 ２値化回路
KR980003918A (ko) * 1996-06-26 1998-03-30 김광호 화상 처리 장치에서 화상 데이타 스캔 장치 및 방법

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004224A (en) * 1956-10-04 1961-10-10 Sylvania Electric Prod Variable gain circuit with outputs equal to product of selective inputs
US3187305A (en) * 1960-10-03 1965-06-01 Ibm Character recognition systems
US3202042A (en) * 1962-08-06 1965-08-24 Jamieson Ballard System for measuring separately background and average line luminance or density
USB420712I5 (enExample) * 1964-12-23
GB1214153A (en) * 1967-07-31 1970-12-02 Nat Res Dev Apparatus for analysing signals comprising excursions from a nominally constant background level
US3599148A (en) * 1969-04-22 1971-08-10 Burroughs Corp Quantizing circuit correction for character recognition systems
US3660601A (en) * 1970-06-10 1972-05-02 Ibm Frequency detection system
US3879707A (en) * 1972-12-20 1975-04-22 Ibm Character recognition system for bar coded characters

Also Published As

Publication number Publication date
FR2298833A1 (fr) 1976-08-20
US3987413A (en) 1976-10-19
JPS5197940A (enExample) 1976-08-28
DE2553077A1 (de) 1976-07-29
NL7514285A (nl) 1976-07-26
SE7514702L (sv) 1976-07-23
FR2298833B1 (enExample) 1979-06-29

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed