JPS5761377A - Image reader - Google Patents

Image reader

Info

Publication number
JPS5761377A
JPS5761377A JP55136101A JP13610180A JPS5761377A JP S5761377 A JPS5761377 A JP S5761377A JP 55136101 A JP55136101 A JP 55136101A JP 13610180 A JP13610180 A JP 13610180A JP S5761377 A JPS5761377 A JP S5761377A
Authority
JP
Japan
Prior art keywords
circuit
level
storing
signal
binary
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
JP55136101A
Other languages
Japanese (ja)
Inventor
Ryoji Arai
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP55136101A priority Critical patent/JPS5761377A/en
Publication of JPS5761377A publication Critical patent/JPS5761377A/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
    • H04N1/40—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 Scanning Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To compensate a secular change of an optical device, by storing an electiric signal at every picture element through directly scanning the surface of a reflecting plate and utilizing this electric signal level as a slice level of a binary circuit. CONSTITUTION:An electric signal 10 level at every picture elements obtained by directly scanning the surface of a reflecting plate is detected by a level detection circuit 13 having plural number of detection levels. The obtained result is stored in a storing circuit 16. When a signal obtained by scanning an original is changed to binary code by a binary circuit 11, the corresponding stored contents of picture elements stored in the storing circuit 16 are utilized as a slice level Vs.
JP55136101A 1980-09-30 1980-09-30 Image reader Pending JPS5761377A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55136101A JPS5761377A (en) 1980-09-30 1980-09-30 Image reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55136101A JPS5761377A (en) 1980-09-30 1980-09-30 Image reader

Publications (1)

Publication Number Publication Date
JPS5761377A true JPS5761377A (en) 1982-04-13

Family

ID=15167290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55136101A Pending JPS5761377A (en) 1980-09-30 1980-09-30 Image reader

Country Status (1)

Country Link
JP (1) JPS5761377A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59175279A (en) * 1983-03-25 1984-10-04 Canon Inc Method for correcting shading distortion
JPS60123167A (en) * 1983-12-07 1985-07-01 Canon Inc Shading distortion correction method
JPS62128667A (en) * 1985-11-29 1987-06-10 Oki Electric Ind Co Ltd Electronic blackboard device
JPS63226777A (en) * 1987-03-16 1988-09-21 Oki Electric Ind Co Ltd Image data reading system
JPH0728338U (en) * 1993-11-05 1995-05-30 旭有機材工業株式会社 Irrigation faucet

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59175279A (en) * 1983-03-25 1984-10-04 Canon Inc Method for correcting shading distortion
JPS60123167A (en) * 1983-12-07 1985-07-01 Canon Inc Shading distortion correction method
JPS62128667A (en) * 1985-11-29 1987-06-10 Oki Electric Ind Co Ltd Electronic blackboard device
JPS63226777A (en) * 1987-03-16 1988-09-21 Oki Electric Ind Co Ltd Image data reading system
JPH0728338U (en) * 1993-11-05 1995-05-30 旭有機材工業株式会社 Irrigation faucet

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