DE69423541T2 - Bildkontrastregelung durch Gammasteuerung - Google Patents

Bildkontrastregelung durch Gammasteuerung

Info

Publication number
DE69423541T2
DE69423541T2 DE69423541T DE69423541T DE69423541T2 DE 69423541 T2 DE69423541 T2 DE 69423541T2 DE 69423541 T DE69423541 T DE 69423541T DE 69423541 T DE69423541 T DE 69423541T DE 69423541 T2 DE69423541 T2 DE 69423541T2
Authority
DE
Germany
Prior art keywords
control
image contrast
gamma
contrast control
gamma control
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 - Fee Related
Application number
DE69423541T
Other languages
English (en)
Other versions
DE69423541D1 (de
Inventor
Stephen Herman
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of DE69423541D1 publication Critical patent/DE69423541D1/de
Application granted granted Critical
Publication of DE69423541T2 publication Critical patent/DE69423541T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control
    • 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)
  • Picture Signal Circuits (AREA)
  • Processing Of Color Television Signals (AREA)
DE69423541T 1993-06-14 1994-06-07 Bildkontrastregelung durch Gammasteuerung Expired - Fee Related DE69423541T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/076,565 US5394195A (en) 1993-06-14 1993-06-14 Method and apparatus for performing dynamic gamma contrast control

Publications (2)

Publication Number Publication Date
DE69423541D1 DE69423541D1 (de) 2000-04-27
DE69423541T2 true DE69423541T2 (de) 2000-09-21

Family

ID=22132830

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69423541T Expired - Fee Related DE69423541T2 (de) 1993-06-14 1994-06-07 Bildkontrastregelung durch Gammasteuerung

Country Status (4)

Country Link
US (1) US5394195A (de)
EP (1) EP0630160B1 (de)
JP (1) JPH07143358A (de)
DE (1) DE69423541T2 (de)

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JP3501252B2 (ja) * 1995-06-16 2004-03-02 三菱電機株式会社 階調補正装置
US5909249A (en) * 1995-12-15 1999-06-01 General Instrument Corporation Reduction of noise visibility in a digital video system
EP0967809A1 (de) * 1998-06-22 1999-12-29 Deutsche Thomson-Brandt Gmbh Gammaanpassung einer Videoverarbeitungsschaltung mittels drei Messströmen
US6449389B1 (en) * 1999-09-24 2002-09-10 Xerox Corporation Method and apparatus for single channel color image segmentation using local context based adaptive weighting
US6633343B2 (en) * 2000-03-14 2003-10-14 Matsushita Electric Industrial Co., Ltd. Dynamic gamma correction apparatus
US7064740B2 (en) * 2001-11-09 2006-06-20 Sharp Laboratories Of America, Inc. Backlit display with improved dynamic range
KR100590529B1 (ko) * 2003-11-04 2006-06-15 삼성전자주식회사 영상의 국부적 휘도 향상 방법 및 장치와 컴퓨터프로그램을 저장하는 컴퓨터로 읽을 수 있는 기록 매체
WO2005052673A2 (en) 2003-11-21 2005-06-09 Sharp Laboratories Of America, Inc. Liquid crystal display with adaptive color
WO2005067453A2 (en) * 2003-12-18 2005-07-28 Sharp Laboratories Of America, Inc. Dynamic gamma for a liquid crystal display
JP4497959B2 (ja) 2004-03-05 2010-07-07 キヤノン株式会社 映像信号処理装置及び映像信号処理方法
US7505018B2 (en) * 2004-05-04 2009-03-17 Sharp Laboratories Of America, Inc. Liquid crystal display with reduced black level insertion
US7872631B2 (en) * 2004-05-04 2011-01-18 Sharp Laboratories Of America, Inc. Liquid crystal display with temporal black point
US8395577B2 (en) * 2004-05-04 2013-03-12 Sharp Laboratories Of America, Inc. Liquid crystal display with illumination control
US7532192B2 (en) * 2004-05-04 2009-05-12 Sharp Laboratories Of America, Inc. Liquid crystal display with filtered black point
US7777714B2 (en) * 2004-05-04 2010-08-17 Sharp Laboratories Of America, Inc. Liquid crystal display with adaptive width
US20050248553A1 (en) * 2004-05-04 2005-11-10 Sharp Laboratories Of America, Inc. Adaptive flicker and motion blur control
US7612757B2 (en) * 2004-05-04 2009-11-03 Sharp Laboratories Of America, Inc. Liquid crystal display with modulated black point
US7602369B2 (en) * 2004-05-04 2009-10-13 Sharp Laboratories Of America, Inc. Liquid crystal display with colored backlight
US7023451B2 (en) * 2004-06-14 2006-04-04 Sharp Laboratories Of America, Inc. System for reducing crosstalk
US7556836B2 (en) * 2004-09-03 2009-07-07 Solae, Llc High protein snack product
US7898519B2 (en) * 2005-02-17 2011-03-01 Sharp Laboratories Of America, Inc. Method for overdriving a backlit display
TWI326443B (en) * 2004-10-27 2010-06-21 Chunghwa Picture Tubes Ltd Dynamic gamma correction circuit, method thereof and plane display device
US8050511B2 (en) * 2004-11-16 2011-11-01 Sharp Laboratories Of America, Inc. High dynamic range images from low dynamic range images
US8050512B2 (en) 2004-11-16 2011-11-01 Sharp Laboratories Of America, Inc. High dynamic range images from low dynamic range images
US7525528B2 (en) * 2004-11-16 2009-04-28 Sharp Laboratories Of America, Inc. Technique that preserves specular highlights
US9143657B2 (en) * 2006-01-24 2015-09-22 Sharp Laboratories Of America, Inc. Color enhancement technique using skin color detection
US8121401B2 (en) * 2006-01-24 2012-02-21 Sharp Labortories of America, Inc. Method for reducing enhancement of artifacts and noise in image color enhancement
KR100809347B1 (ko) 2006-07-31 2008-03-05 삼성전자주식회사 쉐도우 영역 보상 방법 및 장치
US8941580B2 (en) * 2006-11-30 2015-01-27 Sharp Laboratories Of America, Inc. Liquid crystal display with area adaptive backlight
KR100866486B1 (ko) 2007-01-04 2008-11-03 삼성전자주식회사 주변광 적응적인 색 보정 장치 및 방법
JP5241031B2 (ja) * 2009-12-08 2013-07-17 ルネサスエレクトロニクス株式会社 表示装置、表示パネルドライバ、及び画像データ処理装置
DE102011055269A1 (de) * 2011-11-11 2013-05-16 Jenoptik Robot Gmbh Verfahren zur Durchführung einer Dynamikkompression in der Verkehrsfotografie
US9324137B2 (en) * 2012-10-24 2016-04-26 Marvell World Trade Ltd. Low-frequency compression of high dynamic range images
JP5574015B2 (ja) * 2013-05-27 2014-08-20 株式会社ニコン 画像処理装置、電子カメラおよび画像処理プログラム
US9721328B2 (en) * 2014-09-19 2017-08-01 Barco N.V. Method to enhance contrast with reduced visual artifacts
CN113900147B (zh) * 2020-07-06 2024-05-28 中国石油天然气股份有限公司 沙丘鸣震压制方法及系统
CN112532958B (zh) * 2020-11-24 2022-09-06 海宁奕斯伟集成电路设计有限公司 图像处理方法、装置、电子设备以及可读存储介质

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Publication number Priority date Publication date Assignee Title
DE2921246A1 (de) * 1979-05-25 1980-12-04 Bosch Gmbh Robert Verfahren und schaltung zur kontrastkorrektur von farbfernsehsignalen
JPS56107674A (en) * 1980-01-31 1981-08-26 Sony Corp Gradation correcting device of video signal
US4667228A (en) * 1983-10-14 1987-05-19 Canon Kabushiki Kaisha Image signal processing apparatus
EP0278137B1 (de) * 1987-02-11 1992-12-02 Digivision, Inc. Im Echtzeitbetrieb arbeitende lokale Videobildverbesserung mit trennbaren zweidimensionalen Filtern
US4829381A (en) * 1988-04-18 1989-05-09 Polaroid Corporation System and method for electronic image enhancement by dynamic pixel transformation

Also Published As

Publication number Publication date
US5394195A (en) 1995-02-28
DE69423541D1 (de) 2000-04-27
EP0630160B1 (de) 2000-03-22
JPH07143358A (ja) 1995-06-02
EP0630160A3 (de) 1997-01-02
EP0630160A2 (de) 1994-12-21

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee