JPS56123539A - Automatic calibration circuit - Google Patents

Automatic calibration circuit

Info

Publication number
JPS56123539A
JPS56123539A JP2715180A JP2715180A JPS56123539A JP S56123539 A JPS56123539 A JP S56123539A JP 2715180 A JP2715180 A JP 2715180A JP 2715180 A JP2715180 A JP 2715180A JP S56123539 A JPS56123539 A JP S56123539A
Authority
JP
Japan
Prior art keywords
color
amplifier
simulator
automatic calibration
accurate
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
JP2715180A
Other languages
Japanese (ja)
Inventor
Satoru Horiguchi
Tsugio Yaguchi
Kazuhiko Sano
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.)
Dai Nippon Printing Co Ltd
Ikegami Tsushinki Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Ikegami Tsushinki Co Ltd
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 Dai Nippon Printing Co Ltd, Ikegami Tsushinki Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP2715180A priority Critical patent/JPS56123539A/en
Publication of JPS56123539A publication Critical patent/JPS56123539A/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
    • H04N1/60—Colour correction or control
    • H04N1/6011—Colour correction or control with simulation on a subsidiary picture reproducer

Landscapes

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

Abstract

PURPOSE:To make easy and accurate for the adjustment of 4-color, by the automatic calibration of a print color simulator, through the gain control of an amplifier in the comparison between the photoelectric conversion video signal processed at amplifiers and the reference voltage. CONSTITUTION:When a calibration switch 13 is closed without setting color separation panel to a print color simulator, a glass on the stand is scanned, and a cyane, magenta, yellow and black color photoelectric conversion device 1 produces a video signal corresponding to white color, and it is fed to a comparator 16 of a detector 14 via the video processing circuit including an amplifier 3, sample hold circut 9 of a network area rate measuring circuit 7, A/D converter 10, and counter 11. Further, it is compared with the digital reference voltage corresponding to the white color, the positive/negative voltage switches S1, S2 are controlled, and the gain of the amplifier 3 is controlled via an analog memory 15 for automatic calibration of the print color simulator, allowing to make easy and accurate the 4-color adjustment.
JP2715180A 1980-03-04 1980-03-04 Automatic calibration circuit Pending JPS56123539A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2715180A JPS56123539A (en) 1980-03-04 1980-03-04 Automatic calibration circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2715180A JPS56123539A (en) 1980-03-04 1980-03-04 Automatic calibration circuit

Publications (1)

Publication Number Publication Date
JPS56123539A true JPS56123539A (en) 1981-09-28

Family

ID=12213039

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2715180A Pending JPS56123539A (en) 1980-03-04 1980-03-04 Automatic calibration circuit

Country Status (1)

Country Link
JP (1) JPS56123539A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972870A (en) * 1982-10-20 1984-04-24 Canon Inc Information reader
JPS5979674A (en) * 1982-10-28 1984-05-08 Toshiba Corp Color adhesion sensor
JPS6243971A (en) * 1985-08-21 1987-02-25 Matsushita Graphic Commun Syst Inc Color original reader
JPS62143228U (en) * 1986-03-04 1987-09-09

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972870A (en) * 1982-10-20 1984-04-24 Canon Inc Information reader
JPS5979674A (en) * 1982-10-28 1984-05-08 Toshiba Corp Color adhesion sensor
JPS6243971A (en) * 1985-08-21 1987-02-25 Matsushita Graphic Commun Syst Inc Color original reader
JPS62143228U (en) * 1986-03-04 1987-09-09
JPH0635236Y2 (en) * 1986-03-04 1994-09-14 ノーリツ鋼機株式会社 Gain adjusting device for color component measuring device of negative film

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