JPH0223066B2 - - Google Patents

Info

Publication number
JPH0223066B2
JPH0223066B2 JP56034378A JP3437881A JPH0223066B2 JP H0223066 B2 JPH0223066 B2 JP H0223066B2 JP 56034378 A JP56034378 A JP 56034378A JP 3437881 A JP3437881 A JP 3437881A JP H0223066 B2 JPH0223066 B2 JP H0223066B2
Authority
JP
Japan
Prior art keywords
reading
document
light
white
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.)
Expired - Lifetime
Application number
JP56034378A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57148463A (en
Inventor
Takeshi Ikeda
Kazuya Ijuin
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 JP56034378A priority Critical patent/JPS57148463A/ja
Publication of JPS57148463A publication Critical patent/JPS57148463A/ja
Publication of JPH0223066B2 publication Critical patent/JPH0223066B2/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)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Editing Of Facsimile Originals (AREA)
JP56034378A 1981-03-10 1981-03-10 Reader Granted JPS57148463A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56034378A JPS57148463A (en) 1981-03-10 1981-03-10 Reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56034378A JPS57148463A (en) 1981-03-10 1981-03-10 Reader

Publications (2)

Publication Number Publication Date
JPS57148463A JPS57148463A (en) 1982-09-13
JPH0223066B2 true JPH0223066B2 (en]) 1990-05-22

Family

ID=12412502

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56034378A Granted JPS57148463A (en) 1981-03-10 1981-03-10 Reader

Country Status (1)

Country Link
JP (1) JPS57148463A (en])

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3885987B2 (ja) 2000-05-18 2007-02-28 株式会社リコー 画像読取装置および画像形成装置

Also Published As

Publication number Publication date
JPS57148463A (en) 1982-09-13

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