JPS55161466A - Gamma correction method and unit in picture input/output system - Google Patents

Gamma correction method and unit in picture input/output system

Info

Publication number
JPS55161466A
JPS55161466A JP6903979A JP6903979A JPS55161466A JP S55161466 A JPS55161466 A JP S55161466A JP 6903979 A JP6903979 A JP 6903979A JP 6903979 A JP6903979 A JP 6903979A JP S55161466 A JPS55161466 A JP S55161466A
Authority
JP
Japan
Prior art keywords
aperture
gamma correction
signal
density level
output
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
JP6903979A
Other languages
Japanese (ja)
Inventor
Keiji Sekikawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP6903979A priority Critical patent/JPS55161466A/en
Publication of JPS55161466A publication Critical patent/JPS55161466A/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
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level

Landscapes

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

Abstract

PURPOSE:To input and output always pictures in a uniform level, by designating addresses of a memory unit, where gamma correction values are stored, by an aperture size detection signal and a density level signal from the mounted aperture. CONSTITUTION:Operator 2 performs a prescribed address operation according to detection signal AP corresponding to size of the aperture, actual I/O density level signal (k) dependent upon the aperture, and instruction signal SP instructing scanning or plotting. Gamma correction values are stored in ROM3 according to various aperture size. A prescribed gamma correction value is called according to address signal AD of operator 2 and is output through buffer memory 4 as correction density level signal k'. Thus, pictures can be always input and output in a uniform density level only by mounting the aperture.
JP6903979A 1979-06-02 1979-06-02 Gamma correction method and unit in picture input/output system Pending JPS55161466A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6903979A JPS55161466A (en) 1979-06-02 1979-06-02 Gamma correction method and unit in picture input/output system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6903979A JPS55161466A (en) 1979-06-02 1979-06-02 Gamma correction method and unit in picture input/output system

Publications (1)

Publication Number Publication Date
JPS55161466A true JPS55161466A (en) 1980-12-16

Family

ID=13391036

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6903979A Pending JPS55161466A (en) 1979-06-02 1979-06-02 Gamma correction method and unit in picture input/output system

Country Status (1)

Country Link
JP (1) JPS55161466A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059859A (en) * 1983-09-13 1985-04-06 Matsushita Graphic Commun Syst Inc Original reader
JPH0522584A (en) * 1991-07-09 1993-01-29 Canon Inc Color picture recording method and device
JP2003038886A (en) * 2001-07-31 2003-02-12 Janome Sewing Mach Co Ltd Sewing machine with needle threader

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059859A (en) * 1983-09-13 1985-04-06 Matsushita Graphic Commun Syst Inc Original reader
JPH0522584A (en) * 1991-07-09 1993-01-29 Canon Inc Color picture recording method and device
JP2003038886A (en) * 2001-07-31 2003-02-12 Janome Sewing Mach Co Ltd Sewing machine with needle threader

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