KR920003767A - 영상신호의 계조 보정장치 - Google Patents
영상신호의 계조 보정장치 Download PDFInfo
- Publication number
- KR920003767A KR920003767A KR1019910012010A KR910012010A KR920003767A KR 920003767 A KR920003767 A KR 920003767A KR 1019910012010 A KR1019910012010 A KR 1019910012010A KR 910012010 A KR910012010 A KR 910012010A KR 920003767 A KR920003767 A KR 920003767A
- Authority
- KR
- South Korea
- Prior art keywords
- circuit
- pedestal
- luminance signal
- voltage
- detection circuit
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
-
- 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
- H04N5/16—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/18—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
- H04N5/185—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Picture Signal Circuits (AREA)
Abstract
Description
Claims (3)
- 영상휘도신호의 페데스탈을 페데스탈전압에 클램프하는 페데스탈클램프회로와, 영상휘도신호의 가장 어두운 부분의 레벨을 검출하는 흑레벨검출회로와, 상기 흑레벨검출회로에서의 검출결과와 영상휘도신호의 페데스탈전압에 의해 상기 영상휘도신호의 흑레벨을 페데스탈 근처까지 신장하는 흑레벨신장회로와, 상기 흑레벨검출회로의 출력전압과 영상휘도신호의 페데스탈전압의 차이를 취하는 감산회로와, 상기 감산회로의 출력전압에 따라서 색신호의 포화도를 억제하는 색포화도 제어회로를 가지는 것을 특징으로 하는 영상신호의 계조보정장치.
- 영상휘도신호의 페데스탈을 페데스탈전압에 클램프하는 페데스탈클램프회로와, 영상휘도신호의 가장 밝은 부분의 레벨을 검출하는 백레벨검출회로와, 상기 백레벨검출회로에서의 검출결과와 미리 외부로부터 부여되는 백레벨제어전압에 의해 상기 영상휘도신호의 전달특성의 감마계수를 변화시키는 것을 특징으로 하는 감마보정회로와, 상기 백레벨검출회로의 출력전압과 백레벨제어전압의 차이를 취하는 감산회로와, 상기 백레벨검출회로의 출력접압과 백레벨제어전압의 차이를 취하는 감산회로와, 상기 감산회로의 출력전압에 따라서 색신호의 포화도를 제어하는 색포화도 제어장치를 가진 것을 특징으로 하는 영상신호의 계조보정장치.
- 영상휘도신호의 페데스탈을 페데스탈전압에 클램프하는 페데스탈클램프회로와, 영상휘도신호의 가장 어두운 부분의 레벨을 검출하는 흑레벨검출회로와, 상기 흑레벨검출회로에서의 검출결과와 영상휘도신호의 페데스탈전압에 의해 상기 영상휘도신호의 흑레벨을 페데스탈 근처까지 신장하는 흑레벨신장회로와, 상기 흑레벨검출회로의 출력전압과 영상휘도신호의 페데스탈전압의 차이를 취하는 제1의 감산회로를 구비하는 동시에, 상기 영상휘도신호의 가장 밝은 부분의 레벨을 검출하는 백레벨검출회로와, 상기 백레벨검출회로에서의 검출결과와 미리 외부로부터 부여되는 백레벨제어전압에 의해 상기 영상휘도신호의 전달특성의 감마계수를 변화시키는 특징으로 하는 감마보정회로와, 상기 백레벨검출회로의 출력전압과 백레벨제어전압의 차이를 취하는 제2의 감산회로를 구비하고, 상기 제1 및 제2감산회로로부터의 각각의 색보정신호를 색포화도 제어전압에 가산하는 가산회로와, 상기 가산회로로부터의 가산색보정된 신호에 의거 입력색신호의 색포화도를 제어하는 색포화도제어회로를 가진 것을 특징으로 하는 영상신호의 계조보정장치.※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP?2-187294 | 1990-07-17 | ||
JP2187294A JP2784839B2 (ja) | 1990-07-17 | 1990-07-17 | 映像信号の階調補正装置 |
JP90-187294 | 1990-07-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR920003767A true KR920003767A (ko) | 1992-02-29 |
KR930011182B1 KR930011182B1 (ko) | 1993-11-24 |
Family
ID=16203481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019910012010A Expired - Fee Related KR930011182B1 (ko) | 1990-07-17 | 1991-07-15 | 영상신호의 계조 보정장치 |
Country Status (7)
Country | Link |
---|---|
US (1) | US5255080A (ko) |
EP (1) | EP0467602B1 (ko) |
JP (1) | JP2784839B2 (ko) |
KR (1) | KR930011182B1 (ko) |
CA (1) | CA2047149C (ko) |
DE (1) | DE69116250T2 (ko) |
MY (1) | MY106878A (ko) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7085511B2 (en) | 2003-12-10 | 2006-08-01 | Samsung Electronics Co., Ltd. | Oxidation catalyst device and wet-type electro-photographic imageforming apparatus having the same |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3016652B2 (ja) * | 1992-02-07 | 2000-03-06 | 松下電器産業株式会社 | ゲインコントロール回路 |
JP3136850B2 (ja) * | 1993-07-28 | 2001-02-19 | 松下電器産業株式会社 | 映像信号の階調補正装置 |
JP3429842B2 (ja) * | 1994-04-15 | 2003-07-28 | 松下電器産業株式会社 | 映像信号の画像情報検出装置 |
SG64404A1 (en) * | 1996-11-06 | 1999-04-27 | Sgs Thomson Microelectric Asia | A method & apparatus for correcting colour difference signals |
EP1372340B1 (en) * | 1998-06-02 | 2006-12-13 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for dynamic contrast improvement in video pictures |
JP3451583B2 (ja) * | 1999-06-25 | 2003-09-29 | Nec液晶テクノロジー株式会社 | 液晶表示装置のクランプ回路 |
JP2002095512A (ja) * | 2000-09-21 | 2002-04-02 | Komaya:Kk | 貨幣類の識別構造 |
JP4659272B2 (ja) * | 2001-05-31 | 2011-03-30 | パナソニック株式会社 | 階調補正装置 |
JP3844430B2 (ja) * | 2001-06-26 | 2006-11-15 | 三菱電機株式会社 | 映像信号処理装置および映像信号処理方法 |
US6894666B2 (en) * | 2001-12-12 | 2005-05-17 | Samsung Sdi Co., Ltd. | Contrast correcting circuit |
JP3783645B2 (ja) * | 2002-04-05 | 2006-06-07 | 株式会社日立製作所 | コントラスト調整方法、コントラスト調整回路及びそれを用いた映像表示装置 |
JP3729157B2 (ja) * | 2002-06-25 | 2005-12-21 | ソニー株式会社 | 映像信号処理装置及び方法 |
KR100449744B1 (ko) * | 2002-10-21 | 2004-09-22 | 삼성전자주식회사 | 영상 처리 장치에서의 화면 밝기 제어 방법 및 장치 |
JP4155043B2 (ja) * | 2003-02-04 | 2008-09-24 | 松下電器産業株式会社 | 映像信号補正回路 |
JP4617989B2 (ja) * | 2005-04-28 | 2011-01-26 | 株式会社日立製作所 | 映像処理装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1400427A (en) * | 1971-11-08 | 1975-07-16 | Rca Corp | Video signal processing apparatus |
US3928867A (en) * | 1974-05-10 | 1975-12-23 | Gen Electric | Television receiver with picture level control |
US4038685A (en) * | 1975-03-31 | 1977-07-26 | Rca Corporation | Apparatus for automatic gamma control of television color signals |
FR2406922A1 (fr) * | 1977-10-21 | 1979-05-18 | Thomson Csf | Dispositif d'expansion de contraste video et systeme comportant un tel dispositif |
DE3629403C2 (de) * | 1986-08-29 | 1994-09-29 | Agfa Gevaert Ag | Verfahren zur Korrektur der Farbsättigung bei der elektronischen Bildverarbeitung |
JPS645569U (ko) * | 1987-06-26 | 1989-01-12 | ||
DE3809303A1 (de) * | 1988-03-19 | 1989-10-05 | Itt Ind Gmbh Deutsche | Schaltungsanordnung zur farbsaettigungseinstellung |
US5068718A (en) * | 1988-11-04 | 1991-11-26 | Fuji Photo Film Co., Ltd. | Image quality correcting system for use with an imaging apparatus |
US5003394A (en) * | 1989-08-25 | 1991-03-26 | Rca Licensing Corporation | Dynamic video system including automatic contrast and "white-stretch" processing sections |
-
1990
- 1990-07-17 JP JP2187294A patent/JP2784839B2/ja not_active Expired - Fee Related
-
1991
- 1991-07-10 US US07/727,969 patent/US5255080A/en not_active Expired - Fee Related
- 1991-07-12 DE DE69116250T patent/DE69116250T2/de not_active Expired - Fee Related
- 1991-07-12 MY MYPI91001264A patent/MY106878A/en unknown
- 1991-07-12 EP EP91306322A patent/EP0467602B1/en not_active Expired - Lifetime
- 1991-07-15 KR KR1019910012010A patent/KR930011182B1/ko not_active Expired - Fee Related
- 1991-07-16 CA CA002047149A patent/CA2047149C/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7085511B2 (en) | 2003-12-10 | 2006-08-01 | Samsung Electronics Co., Ltd. | Oxidation catalyst device and wet-type electro-photographic imageforming apparatus having the same |
Also Published As
Publication number | Publication date |
---|---|
MY106878A (en) | 1995-08-30 |
KR930011182B1 (ko) | 1993-11-24 |
US5255080A (en) | 1993-10-19 |
DE69116250T2 (de) | 1996-09-19 |
EP0467602A3 (en) | 1993-04-28 |
CA2047149A1 (en) | 1992-01-18 |
DE69116250D1 (de) | 1996-02-22 |
CA2047149C (en) | 1998-05-05 |
EP0467602A2 (en) | 1992-01-22 |
EP0467602B1 (en) | 1996-01-10 |
JP2784839B2 (ja) | 1998-08-06 |
JPH0477179A (ja) | 1992-03-11 |
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