JPS57180271A - Original reader - Google Patents

Original reader

Info

Publication number
JPS57180271A
JPS57180271A JP56064611A JP6461181A JPS57180271A JP S57180271 A JPS57180271 A JP S57180271A JP 56064611 A JP56064611 A JP 56064611A JP 6461181 A JP6461181 A JP 6461181A JP S57180271 A JPS57180271 A JP S57180271A
Authority
JP
Japan
Prior art keywords
signal
threshold value
binary
given
terminal
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
JP56064611A
Other languages
Japanese (ja)
Other versions
JPS6156671B2 (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 JP56064611A priority Critical patent/JPS57180271A/en
Publication of JPS57180271A publication Critical patent/JPS57180271A/en
Publication of JPS6156671B2 publication Critical patent/JPS6156671B2/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

Landscapes

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

Abstract

PURPOSE:To eliminate effect of the ununiformity of two dimensional reading system, by magnifying the level of detected ununiformity for a prescribed time, determining a threshold value for binary coded reading signals, and forming a binary picture signal with the optimum threshold value. CONSTITUTION:An original read signal is given to an input terminal 9, and the signal is converted into a binary signal corresponding to black and white with a threshod value signal given from a threshold value generating circuit 10 at a binary circuit 11 and outputted from an output terminal 12. The threshold value signal outputted from the said circit 10 is not a constant level signal, but formed based on the original read signal given from the terminal 9. Thus, the circuit 10 is connected to the terminal 9, the unniformity is picked up from the original reading signal to be given to generate the threshold value for binary coding.
JP56064611A 1981-04-28 1981-04-28 Original reader Granted JPS57180271A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56064611A JPS57180271A (en) 1981-04-28 1981-04-28 Original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56064611A JPS57180271A (en) 1981-04-28 1981-04-28 Original reader

Publications (2)

Publication Number Publication Date
JPS57180271A true JPS57180271A (en) 1982-11-06
JPS6156671B2 JPS6156671B2 (en) 1986-12-03

Family

ID=13263226

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56064611A Granted JPS57180271A (en) 1981-04-28 1981-04-28 Original reader

Country Status (1)

Country Link
JP (1) JPS57180271A (en)

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

Also Published As

Publication number Publication date
JPS6156671B2 (en) 1986-12-03

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