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JPS57173259A - Original reader - Google Patents

Original reader

Info

Publication number
JPS57173259A
JPS57173259A JP56058857A JP5885781A JPS57173259A JP S57173259 A JPS57173259 A JP S57173259A JP 56058857 A JP56058857 A JP 56058857A JP 5885781 A JP5885781 A JP 5885781A JP S57173259 A JPS57173259 A JP S57173259A
Authority
JP
Japan
Prior art keywords
irregularity
value
picture element
signal
readout
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.)
Granted
Application number
JP56058857A
Other languages
Japanese (ja)
Other versions
JPS6156667B2 (en
Inventor
Yoshihiro Nagata
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56058857A priority Critical patent/JPS57173259A/en
Publication of JPS57173259A publication Critical patent/JPS57173259A/en
Publication of JPS6156667B2 publication Critical patent/JPS6156667B2/ja
Granted 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
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To correct the irregularity of an original readout signal due to the influence of a light source and a lens by detecting the irregularity of the original readout signal and then generating a correcting signal which corresponds to the result of the detection. CONSTITUTION:A readout singal inputted from an input terminal 18 is applied to a maximum value detecting circuit 20 through an A/D converter 19. Assuming that the maximum value detecting circuit 20 outputs a value of irregularity regarding a picture element A, this signal is inputted to a one-line delay circuit 22 and a one-picture-element delay circuit 21 to achieve delay by one line and one picture element. The outputs of those delay circuits are multiplied by prescribed constants before being inputted to a maximum value counting circuit 20. Consequently, the maximum value among the value of a picture element C read at present, the value of the irregularity of the readout signal of a picture element B just before it, and the value of the irregularity of the readout singal of a picture element A one line before is regarded as the value of the irregularity of the picture element C, and this is utilized as a correction signal.
JP56058857A 1981-04-17 1981-04-17 Original reader Granted JPS57173259A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56058857A JPS57173259A (en) 1981-04-17 1981-04-17 Original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56058857A JPS57173259A (en) 1981-04-17 1981-04-17 Original reader

Publications (2)

Publication Number Publication Date
JPS57173259A true JPS57173259A (en) 1982-10-25
JPS6156667B2 JPS6156667B2 (en) 1986-12-03

Family

ID=13096364

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56058857A Granted JPS57173259A (en) 1981-04-17 1981-04-17 Original reader

Country Status (1)

Country Link
JP (1) JPS57173259A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6054569A (en) * 1983-09-05 1985-03-29 Canon Inc Color image recording device
US4916549A (en) * 1987-06-24 1990-04-10 Kabushiki Kaisha Toshiba Image sensing apparatus with shading compensation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5345115A (en) * 1976-10-06 1978-04-22 Hitachi Denshi Ltd Binary circuit
JPS53136424A (en) * 1977-05-02 1978-11-29 Nippon Telegr & Teleph Corp <Ntt> Correlative processing system for picture signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5345115A (en) * 1976-10-06 1978-04-22 Hitachi Denshi Ltd Binary circuit
JPS53136424A (en) * 1977-05-02 1978-11-29 Nippon Telegr & Teleph Corp <Ntt> Correlative processing system for picture signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6054569A (en) * 1983-09-05 1985-03-29 Canon Inc Color image recording device
JPH0515106B2 (en) * 1983-09-05 1993-02-26 Canon Kk
US4916549A (en) * 1987-06-24 1990-04-10 Kabushiki Kaisha Toshiba Image sensing apparatus with shading compensation

Also Published As

Publication number Publication date
JPS6156667B2 (en) 1986-12-03

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