JPS57129069A - Image reproducing device - Google Patents

Image reproducing device

Info

Publication number
JPS57129069A
JPS57129069A JP56014522A JP1452281A JPS57129069A JP S57129069 A JPS57129069 A JP S57129069A JP 56014522 A JP56014522 A JP 56014522A JP 1452281 A JP1452281 A JP 1452281A JP S57129069 A JPS57129069 A JP S57129069A
Authority
JP
Japan
Prior art keywords
signal
threshold
half tone
read
original
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
JP56014522A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0231544B2 (enrdf_load_stackoverflow
Inventor
Yutaka Komiya
Toshiaki Yagasaki
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 JP56014522A priority Critical patent/JPS57129069A/ja
Publication of JPS57129069A publication Critical patent/JPS57129069A/ja
Publication of JPH0231544B2 publication Critical patent/JPH0231544B2/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
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • 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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Image Input (AREA)
  • Facsimile Image Signal Circuits (AREA)
JP56014522A 1981-02-03 1981-02-03 Image reproducing device Granted JPS57129069A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56014522A JPS57129069A (en) 1981-02-03 1981-02-03 Image reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56014522A JPS57129069A (en) 1981-02-03 1981-02-03 Image reproducing device

Publications (2)

Publication Number Publication Date
JPS57129069A true JPS57129069A (en) 1982-08-10
JPH0231544B2 JPH0231544B2 (enrdf_load_stackoverflow) 1990-07-13

Family

ID=11863428

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56014522A Granted JPS57129069A (en) 1981-02-03 1981-02-03 Image reproducing device

Country Status (1)

Country Link
JP (1) JPS57129069A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59216373A (ja) * 1983-05-24 1984-12-06 Canon Inc 画像処理装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51106441A (enrdf_load_stackoverflow) * 1975-03-17 1976-09-21 Ricoh Kk
JPS5288343A (en) * 1976-01-19 1977-07-23 Ricoh Co Ltd Copying machine
JPS5382354A (en) * 1976-12-28 1978-07-20 Ricoh Co Ltd Optica device fdr electrophotographic copier
JPS5492742A (en) * 1977-12-29 1979-07-23 Ricoh Co Ltd Control method for copier image quality

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51106441A (enrdf_load_stackoverflow) * 1975-03-17 1976-09-21 Ricoh Kk
JPS5288343A (en) * 1976-01-19 1977-07-23 Ricoh Co Ltd Copying machine
JPS5382354A (en) * 1976-12-28 1978-07-20 Ricoh Co Ltd Optica device fdr electrophotographic copier
JPS5492742A (en) * 1977-12-29 1979-07-23 Ricoh Co Ltd Control method for copier image quality

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59216373A (ja) * 1983-05-24 1984-12-06 Canon Inc 画像処理装置

Also Published As

Publication number Publication date
JPH0231544B2 (enrdf_load_stackoverflow) 1990-07-13

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