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IT1219119B - Circuito di regolazione automatica della soglia di un segnale di lettura per un dispositivo di scansione digitale di immagini - Google Patents

Circuito di regolazione automatica della soglia di un segnale di lettura per un dispositivo di scansione digitale di immagini

Info

Publication number
IT1219119B
IT1219119B IT67233/88A IT6723388A IT1219119B IT 1219119 B IT1219119 B IT 1219119B IT 67233/88 A IT67233/88 A IT 67233/88A IT 6723388 A IT6723388 A IT 6723388A IT 1219119 B IT1219119 B IT 1219119B
Authority
IT
Italy
Prior art keywords
digital image
scanning device
adjustment circuit
image scanning
reading signal
Prior art date
Application number
IT67233/88A
Other languages
English (en)
Other versions
IT8867233A0 (it
Inventor
Giuseppe Fogaroli
Ennio Sgreccia
Giorgio Tadini
Original Assignee
Olivetti & Co Spa
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 Olivetti & Co Spa filed Critical Olivetti & Co Spa
Priority to IT67233/88A priority Critical patent/IT1219119B/it
Publication of IT8867233A0 publication Critical patent/IT8867233A0/it
Priority to EP19890301080 priority patent/EP0333313A3/en
Priority to US07/309,086 priority patent/US4970605A/en
Priority to JP1065792A priority patent/JPH01303870A/ja
Application granted granted Critical
Publication of IT1219119B publication Critical patent/IT1219119B/it

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Input (AREA)
  • Character Input (AREA)
  • Manipulation Of Pulses (AREA)
IT67233/88A 1988-03-18 1988-03-18 Circuito di regolazione automatica della soglia di un segnale di lettura per un dispositivo di scansione digitale di immagini IT1219119B (it)

Priority Applications (4)

Application Number Priority Date Filing Date Title
IT67233/88A IT1219119B (it) 1988-03-18 1988-03-18 Circuito di regolazione automatica della soglia di un segnale di lettura per un dispositivo di scansione digitale di immagini
EP19890301080 EP0333313A3 (en) 1988-03-18 1989-02-03 Circuit for automatically adjusting the digitisation threshold of a reading signal for a digital image scanning device
US07/309,086 US4970605A (en) 1988-03-18 1989-02-06 Digital image scanning device having an automatic background compensation circuit
JP1065792A JPH01303870A (ja) 1988-03-18 1989-03-17 デジタル画像走査装置用読取信号のデジタル化閾値の自動調整回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT67233/88A IT1219119B (it) 1988-03-18 1988-03-18 Circuito di regolazione automatica della soglia di un segnale di lettura per un dispositivo di scansione digitale di immagini

Publications (2)

Publication Number Publication Date
IT8867233A0 IT8867233A0 (it) 1988-03-18
IT1219119B true IT1219119B (it) 1990-05-03

Family

ID=11300705

Family Applications (1)

Application Number Title Priority Date Filing Date
IT67233/88A IT1219119B (it) 1988-03-18 1988-03-18 Circuito di regolazione automatica della soglia di un segnale di lettura per un dispositivo di scansione digitale di immagini

Country Status (4)

Country Link
US (1) US4970605A (it)
EP (1) EP0333313A3 (it)
JP (1) JPH01303870A (it)
IT (1) IT1219119B (it)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5060083A (en) * 1989-01-13 1991-10-22 Ricoh Company, Ltd. Background level detection method
US5271038A (en) * 1990-09-10 1993-12-14 Hughes Aircraft Company Distortion suppression using thresholding techniques
WO1992007441A1 (en) * 1990-10-15 1992-04-30 The Gerber Scientific Instrument Company A large area digital scanner
EP0548571A1 (en) * 1991-11-25 1993-06-30 Eastman Kodak Company System and method for bidirectional adaptive thresholding
US5282061A (en) * 1991-12-23 1994-01-25 Xerox Corporation Programmable apparatus for determining document background level
US5396280A (en) * 1993-02-26 1995-03-07 International Business Machines, Corporation Analog video processing apparatus and method for eliminating background levels in the analog signal
US6995866B2 (en) 2000-09-20 2006-02-07 Sharp Laboratories Of America, Inc. Method and apparatus for background adjustment in color reproduction devices
US7831063B2 (en) * 2007-02-19 2010-11-09 Laughlin Richard H Small event detector in presence of clutter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723649A (en) * 1971-04-27 1973-03-27 Electronic Image Syst Corp Adaptive binary state decision system
US3790706A (en) * 1972-05-25 1974-02-05 Boeing Co Automatic video contrast control circuit
US3965290A (en) * 1975-03-21 1976-06-22 Dacom, Inc. Video-to-binary conversion apparatus having moire suppression characteristics
JPS5218132A (en) * 1975-08-01 1977-02-10 Hitachi Ltd Binary circuit
DE2800759C3 (de) * 1978-01-09 1984-08-23 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Verfahren zur Umwandlung eines Videosignals in ein Zwei-Pegel-Signal
JPS58202666A (ja) * 1982-05-21 1983-11-25 Ricoh Co Ltd ２値化方式
US4468704A (en) * 1982-10-28 1984-08-28 Xerox Corporation Adaptive thresholder
JPH0683365B2 (ja) * 1983-05-25 1994-10-19 キヤノン株式会社 画像処理装置
US4709274A (en) * 1983-08-29 1987-11-24 Canon Kabushiki Kaisha Image processing apparatus

Also Published As

Publication number Publication date
EP0333313A2 (en) 1989-09-20
IT8867233A0 (it) 1988-03-18
US4970605A (en) 1990-11-13
EP0333313A3 (en) 1991-05-02
JPH01303870A (ja) 1989-12-07

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Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19950330