JPH0127628B2 - - Google Patents

Info

Publication number
JPH0127628B2
JPH0127628B2 JP54173544A JP17354479A JPH0127628B2 JP H0127628 B2 JPH0127628 B2 JP H0127628B2 JP 54173544 A JP54173544 A JP 54173544A JP 17354479 A JP17354479 A JP 17354479A JP H0127628 B2 JPH0127628 B2 JP H0127628B2
Authority
JP
Japan
Prior art keywords
signal
image
threshold value
output
pixel
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.)
Expired
Application number
JP54173544A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5698078A (en
Inventor
Yutaka Komya
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 JP17354479A priority Critical patent/JPS5698078A/ja
Priority to GB8041374A priority patent/GB2069793B/en
Priority to DE19803049369 priority patent/DE3049369A1/de
Publication of JPS5698078A publication Critical patent/JPS5698078A/ja
Priority to GB08400010A priority patent/GB2140646B/en
Priority to US07/224,257 priority patent/US4812910A/en
Publication of JPH0127628B2 publication Critical patent/JPH0127628B2/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
    • H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Facsimiles In General (AREA)
  • Facsimile Image Signal Circuits (AREA)
JP17354479A 1979-12-29 1979-12-29 Image reproducer Granted JPS5698078A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP17354479A JPS5698078A (en) 1979-12-29 1979-12-29 Image reproducer
GB8041374A GB2069793B (en) 1979-12-29 1980-12-29 Half-tone facsimile
DE19803049369 DE3049369A1 (de) 1979-12-29 1980-12-29 Bildreproduktionsgeraet
GB08400010A GB2140646B (en) 1979-12-29 1984-01-03 Image reproducing equipment
US07/224,257 US4812910A (en) 1979-12-29 1988-07-26 Image reproducing equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17354479A JPS5698078A (en) 1979-12-29 1979-12-29 Image reproducer

Publications (2)

Publication Number Publication Date
JPS5698078A JPS5698078A (en) 1981-08-07
JPH0127628B2 true JPH0127628B2 (enrdf_load_stackoverflow) 1989-05-30

Family

ID=15962492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17354479A Granted JPS5698078A (en) 1979-12-29 1979-12-29 Image reproducer

Country Status (1)

Country Link
JP (1) JPS5698078A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3046030B2 (ja) * 1989-03-13 2000-05-29 株式会社リコー 原稿スキャナ装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051536A (en) * 1975-03-14 1977-09-27 Xerox Corporation Electronic halftone imaging system

Also Published As

Publication number Publication date
JPS5698078A (en) 1981-08-07

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