FR2575885B1 - Renforcateur de contraste pour images video - Google Patents

Renforcateur de contraste pour images video

Info

Publication number
FR2575885B1
FR2575885B1 FR8500105A FR8500105A FR2575885B1 FR 2575885 B1 FR2575885 B1 FR 2575885B1 FR 8500105 A FR8500105 A FR 8500105A FR 8500105 A FR8500105 A FR 8500105A FR 2575885 B1 FR2575885 B1 FR 2575885B1
Authority
FR
France
Prior art keywords
video images
contrast enhancer
enhancer
contrast
images
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
FR8500105A
Other languages
English (en)
Other versions
FR2575885A1 (fr
Inventor
Christian Richard
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR8500105A priority Critical patent/FR2575885B1/fr
Priority to GB8531630A priority patent/GB2170674B/en
Priority to US06/815,932 priority patent/US4654710A/en
Publication of FR2575885A1 publication Critical patent/FR2575885A1/fr
Application granted granted Critical
Publication of FR2575885B1 publication Critical patent/FR2575885B1/fr
Expired 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
FR8500105A 1985-01-04 1985-01-04 Renforcateur de contraste pour images video Expired FR2575885B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR8500105A FR2575885B1 (fr) 1985-01-04 1985-01-04 Renforcateur de contraste pour images video
GB8531630A GB2170674B (en) 1985-01-04 1985-12-23 A contrast amplifier for video images
US06/815,932 US4654710A (en) 1985-01-04 1986-01-03 Contrast amplifier for video images

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8500105A FR2575885B1 (fr) 1985-01-04 1985-01-04 Renforcateur de contraste pour images video

Publications (2)

Publication Number Publication Date
FR2575885A1 FR2575885A1 (fr) 1986-07-11
FR2575885B1 true FR2575885B1 (fr) 1987-02-20

Family

ID=9315020

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8500105A Expired FR2575885B1 (fr) 1985-01-04 1985-01-04 Renforcateur de contraste pour images video

Country Status (3)

Country Link
US (1) US4654710A (fr)
FR (1) FR2575885B1 (fr)
GB (1) GB2170674B (fr)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3782932T2 (de) * 1987-02-11 1993-04-08 Digivision Inc Im echtzeitbetrieb arbeitende lokale videobildverbesserung mit trennbaren zweidimensionalen filtern.
DE3721326A1 (de) * 1987-06-27 1989-01-12 Triumph Adler Ag Ansteuerverfahren fuer eine bildroehre mit unterschiedlich dicker frontscheibe und schaltungsanordnung zur durchfuehrung des verfahrens
JP2833652B2 (ja) * 1988-07-15 1998-12-09 株式会社ヤマトヤ商会 カラーテレビジヨンの画像処理方法及びその装置
US5099330A (en) * 1988-10-28 1992-03-24 Casio Computer Co., Ltd. Contrast control based on mean and deviation values
US4937671A (en) * 1988-12-28 1990-06-26 Zenith Electronics Corporation Digital video black expander
US4975773A (en) * 1989-03-31 1990-12-04 Zenith Electronics Corporation Dynamic range video black level expander
FR2647617B1 (fr) * 1989-05-29 1993-12-03 Begasse Pierre Procede de correction d'un signal video en vue de compenser les differences d'eclairage et dispositifs pour sa mise en oeuvre
US5003394A (en) * 1989-08-25 1991-03-26 Rca Licensing Corporation Dynamic video system including automatic contrast and "white-stretch" processing sections
US5128884A (en) * 1989-12-18 1992-07-07 Prager Kenneth E Black body calibration using image processing techniques
US5221963A (en) * 1990-03-31 1993-06-22 Minolta Camera Kabushiki Kaisha Video camera having a video signal processing apparatus
US5177698A (en) * 1990-07-09 1993-01-05 Eastman Kodak Company Selectable power of two coefficient signal combining circuit
KR940001054B1 (ko) * 1992-02-27 1994-02-08 삼성전자 주식회사 칼라비디오 프린터의 자동콘트라스트보정방법 및 그 장치
JPH0799618A (ja) * 1993-02-02 1995-04-11 Philips Electron Nv 自動利得制御ビデオ装置
KR0134487B1 (ko) * 1993-03-23 1998-04-23 배순훈 캠코더 화면의 주변부 명암 보정 회로
EP0647062B1 (fr) * 1993-09-30 1998-08-05 STMicroelectronics S.r.l. Architecture de filtre, en particulier pour des applications vidéo
DE69824230T2 (de) * 1997-04-08 2005-07-07 Koninklijke Philips Electronics N.V. Verarbeitungssystem einer verrauschten Bildsequenz und medizinisches Untersuchungsgerät mit einem solchen System
EP0963111A1 (fr) * 1998-06-02 1999-12-08 Deutsche Thomson-Brandt Gmbh Méthode et appareil d'amélioration dynamique du contraste dans des images vidéo
EP1372340B1 (fr) * 1998-06-02 2006-12-13 Deutsche Thomson-Brandt Gmbh Méthode et appareil d'amélioration dynamique du contraste dans des images vidéo
US6374279B1 (en) * 1999-02-22 2002-04-16 Nvidia U.S. Investment Company System and method for increasing dual FIR filter efficiency
KR100346840B1 (ko) * 1999-11-04 2002-08-03 삼성전자 주식회사 화면의 펄럭거림을 최소화하는 흑신장 장치 및 그 방법
TW502528B (en) * 1999-11-25 2002-09-11 Matsushita Electric Ind Co Ltd Illumination signal treatment device
JP4420385B2 (ja) * 2001-11-01 2010-02-24 トムソン ライセンシング 動的コントラスト改善方法
US6870542B2 (en) * 2002-06-28 2005-03-22 Nvidia Corporation System and method for filtering graphics data on scanout to a monitor
CN100433812C (zh) * 2003-11-26 2008-11-12 凌阳科技股份有限公司 空域无限脉冲响应滤波器自动对比度限制电路及其方法
US7586492B2 (en) * 2004-12-20 2009-09-08 Nvidia Corporation Real-time display post-processing using programmable hardware

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3638001A (en) * 1970-03-04 1972-01-25 Hewlett Packard Co Method and apparatus for averaging the digital display for a fluctuating digital measurement and improving the resolution of the measurement
US4231065A (en) * 1979-01-11 1980-10-28 Honeywell Inc. Local area contrast enhancement device
US4606009A (en) * 1982-08-20 1986-08-12 John Fluke Mfg. Co., Inc. Step responsive averaging filter
JPS6011119A (ja) * 1983-06-30 1985-01-21 Shimadzu Corp 電子天びん
US4603353A (en) * 1984-01-19 1986-07-29 Rca Corporation Luminance peaking filter for use in digital video signal processing systems

Also Published As

Publication number Publication date
US4654710A (en) 1987-03-31
FR2575885A1 (fr) 1986-07-11
GB8531630D0 (en) 1986-02-05
GB2170674A (en) 1986-08-06
GB2170674B (en) 1989-07-19

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Legal Events

Date Code Title Description
ST Notification of lapse