FR2575885B1 - Renforcateur de contraste pour images video - Google Patents
Renforcateur de contraste pour images videoInfo
- 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
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0278137B1 (fr) * | 1987-02-11 | 1992-12-02 | Digivision, Inc. | Amélioration localisée et en temps réel d'une image vidéo par utilisation de filtres bidimensionnels séparables |
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 |
DE69320194T2 (de) * | 1993-09-30 | 1999-05-06 | Co.Ri.M.Me. Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno, Catania | Filterarchitektur, besonders für Videoanwendungen |
EP0871143B1 (fr) * | 1997-04-08 | 2004-06-02 | Koninklijke Philips Electronics N.V. | Système de traitement d'une séquence d'images bruitées, et appareil d'examen médical incluant un tel système |
EP0963111A1 (fr) * | 1998-06-02 | 1999-12-08 | Deutsche Thomson-Brandt Gmbh | Méthode et appareil d'amélioration dynamique du contraste dans des images vidéo |
EP0963112B1 (fr) * | 1998-06-02 | 2004-04-21 | 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 |
KR20050040849A (ko) * | 2001-11-01 | 2005-05-03 | 톰슨 라이센싱 에스.에이. | 동적 콘트라스트 개선 방법 |
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)
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 |
-
1985
- 1985-01-04 FR FR8500105A patent/FR2575885B1/fr not_active Expired
- 1985-12-23 GB GB8531630A patent/GB2170674B/en not_active Expired
-
1986
- 1986-01-03 US US06/815,932 patent/US4654710A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
GB2170674B (en) | 1989-07-19 |
US4654710A (en) | 1987-03-31 |
FR2575885A1 (fr) | 1986-07-11 |
GB2170674A (en) | 1986-08-06 |
GB8531630D0 (en) | 1986-02-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |