JPH0580193B2 - - Google Patents

Info

Publication number
JPH0580193B2
JPH0580193B2 JP58193128A JP19312883A JPH0580193B2 JP H0580193 B2 JPH0580193 B2 JP H0580193B2 JP 58193128 A JP58193128 A JP 58193128A JP 19312883 A JP19312883 A JP 19312883A JP H0580193 B2 JPH0580193 B2 JP H0580193B2
Authority
JP
Japan
Prior art keywords
primary color
cumulative
signal
color signals
gamma
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
JP58193128A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6084084A (ja
Inventor
Hideaki Kawamura
Taku Sasaki
Nobuaki Sakurada
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 JP58193128A priority Critical patent/JPS6084084A/ja
Priority to US06/659,948 priority patent/US4667228A/en
Priority to DE3437748A priority patent/DE3437748A1/de
Publication of JPS6084084A publication Critical patent/JPS6084084A/ja
Publication of JPH0580193B2 publication Critical patent/JPH0580193B2/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
    • H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original
    • H04N1/4074—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original using histograms
    • 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
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6027—Correction or control of colour gradation or colour contrast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
    • H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Processing (AREA)
  • Processing Of Color Television Signals (AREA)
JP58193128A 1983-10-14 1983-10-14 画像信号処理装置 Granted JPS6084084A (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP58193128A JPS6084084A (ja) 1983-10-14 1983-10-14 画像信号処理装置
US06/659,948 US4667228A (en) 1983-10-14 1984-10-11 Image signal processing apparatus
DE3437748A DE3437748A1 (de) 1983-10-14 1984-10-15 Einrichtung zur bildsignalaufbereitung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58193128A JPS6084084A (ja) 1983-10-14 1983-10-14 画像信号処理装置

Publications (2)

Publication Number Publication Date
JPS6084084A JPS6084084A (ja) 1985-05-13
JPH0580193B2 true JPH0580193B2 (enrdf_load_stackoverflow) 1993-11-08

Family

ID=16302728

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58193128A Granted JPS6084084A (ja) 1983-10-14 1983-10-14 画像信号処理装置

Country Status (1)

Country Link
JP (1) JPS6084084A (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61276071A (ja) * 1985-05-31 1986-12-06 Nec Corp 画像処理装置
JPS6230473A (ja) * 1985-07-31 1987-02-09 Mitsubishi Electric Corp イメ−ジプリンタ装置
JPH0669211B2 (ja) * 1985-10-23 1994-08-31 株式会社東芝 画像処理装置
US5063607A (en) * 1988-10-24 1991-11-05 Hughes Aircraft Company Image contrast enhancement technique
JP2598601B2 (ja) * 1992-04-06 1997-04-09 ライノタイプ−ヘル アクチエンゲゼルシャフト 原画の画像グラデーションの分析および補正方法
JP4590043B2 (ja) * 1999-03-31 2010-12-01 キヤノン株式会社 画質補正回路

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5687044A (en) * 1979-12-17 1981-07-15 Dainippon Screen Mfg Co Ltd Method of determining adjusting items in image scanning recorder

Also Published As

Publication number Publication date
JPS6084084A (ja) 1985-05-13

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