JPS56152376A - Picture reader - Google Patents

Picture reader

Info

Publication number
JPS56152376A
JPS56152376A JP5592080A JP5592080A JPS56152376A JP S56152376 A JPS56152376 A JP S56152376A JP 5592080 A JP5592080 A JP 5592080A JP 5592080 A JP5592080 A JP 5592080A JP S56152376 A JPS56152376 A JP S56152376A
Authority
JP
Japan
Prior art keywords
signal
signals
comparator
slice level
level near
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.)
Pending
Application number
JP5592080A
Other languages
Japanese (ja)
Inventor
Motoharu Fujii
Noboru Yukimura
Koji Sato
Naoki Ayada
Seiji Saito
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP5592080A priority Critical patent/JPS56152376A/en
Publication of JPS56152376A publication Critical patent/JPS56152376A/en
Pending 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
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/58—Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Color Image Communication Systems (AREA)

Abstract

PURPOSE:To prevent a chromatic signal from being mixed into the black information edge of the original, by digitizing the read signal into two signals by different thresholds and by forming a black taking-out signal from one signal group and by subjecting respective signals of the other signal group to the black taking-out operation. CONSTITUTION:The signal of a long wavelength is made binary in the first comparator 10 by the slice level near darkness and is made binary in the second comparator 12 by the slice level near light. Similarly, the signal of a short wavelength is made binary in the first comparator 11 by the slice level near darkness and is made binary in the second comparator 13 by the slice level near light. Respective digitized signals are latched in D type flip flops 14-17. Output signals flip flops 16 and 17 are subjected to the logical operation by AND circuit 18 and become black taking-out signals.
JP5592080A 1980-04-26 1980-04-26 Picture reader Pending JPS56152376A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5592080A JPS56152376A (en) 1980-04-26 1980-04-26 Picture reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5592080A JPS56152376A (en) 1980-04-26 1980-04-26 Picture reader

Publications (1)

Publication Number Publication Date
JPS56152376A true JPS56152376A (en) 1981-11-25

Family

ID=13012536

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5592080A Pending JPS56152376A (en) 1980-04-26 1980-04-26 Picture reader

Country Status (1)

Country Link
JP (1) JPS56152376A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967560A (en) * 1982-10-08 1984-04-17 Canon Inc Color picture recording device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54117617A (en) * 1978-03-03 1979-09-12 Mitsubishi Electric Corp Two-color original reader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54117617A (en) * 1978-03-03 1979-09-12 Mitsubishi Electric Corp Two-color original reader

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967560A (en) * 1982-10-08 1984-04-17 Canon Inc Color picture recording device

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