JPS55158789A - Method and circuit for correcting contrast of color television signal - Google Patents
Method and circuit for correcting contrast of color television signalInfo
- Publication number
- JPS55158789A JPS55158789A JP6907880A JP6907880A JPS55158789A JP S55158789 A JPS55158789 A JP S55158789A JP 6907880 A JP6907880 A JP 6907880A JP 6907880 A JP6907880 A JP 6907880A JP S55158789 A JPS55158789 A JP S55158789A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- television signal
- color television
- circuit
- contrast
- 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
- H04N9/64—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)
- Processing Of Color Television Signals (AREA)
- Color Television Image Signal Generators (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792921246 DE2921246A1 (de) | 1979-05-25 | 1979-05-25 | Verfahren und schaltung zur kontrastkorrektur von farbfernsehsignalen |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55158789A true JPS55158789A (en) | 1980-12-10 |
JPH0316838B2 JPH0316838B2 (ja) | 1991-03-06 |
Family
ID=6071699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6907880A Granted JPS55158789A (en) | 1979-05-25 | 1980-05-26 | Method and circuit for correcting contrast of color television signal |
Country Status (5)
Country | Link |
---|---|
US (1) | US4305090A (ja) |
EP (1) | EP0019735B1 (ja) |
JP (1) | JPS55158789A (ja) |
AT (1) | ATE3352T1 (ja) |
DE (2) | DE2921246A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02125589A (ja) * | 1988-11-04 | 1990-05-14 | Fuji Photo Film Co Ltd | 撮像装置の画質補正方式 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2503970B1 (fr) * | 1981-04-14 | 1985-10-18 | Lgt Lab Gen Telecomm | Dispositif de correction de non-linearite videofrequence a efficacite selective et equipement de television comportant un tel dispositif |
US5068718A (en) * | 1988-11-04 | 1991-11-26 | Fuji Photo Film Co., Ltd. | Image quality correcting system for use with an imaging apparatus |
US5363318A (en) * | 1992-03-23 | 1994-11-08 | Eastman Kodak Company | Method and apparatus for adaptive color characterization and calibration |
US5394195A (en) * | 1993-06-14 | 1995-02-28 | Philips Electronics North America Corporation | Method and apparatus for performing dynamic gamma contrast control |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4850635A (ja) * | 1971-10-27 | 1973-07-17 | ||
JPS494443A (ja) * | 1972-04-25 | 1974-01-16 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3684825A (en) * | 1971-02-19 | 1972-08-15 | Rca Corp | Contrast compression circuits |
DE2348588B2 (de) * | 1973-09-27 | 1975-11-27 | Robert Bosch Gmbh, 7000 Stuttgart | Korrektur von Farbfernseh-Übertragungsanlagen |
US4167750A (en) * | 1975-02-20 | 1979-09-11 | Matsushita Electric Industrial Co., Ltd. | Color-difference signal modifying apparatus |
GB1524720A (en) * | 1976-09-16 | 1978-09-13 | Marconi Co Ltd | Contrast correction arrangements |
-
1979
- 1979-05-25 DE DE19792921246 patent/DE2921246A1/de not_active Withdrawn
-
1980
- 1980-04-30 EP EP80102335A patent/EP0019735B1/de not_active Expired
- 1980-04-30 DE DE8080102335T patent/DE3063060D1/de not_active Expired
- 1980-04-30 AT AT80102335T patent/ATE3352T1/de not_active IP Right Cessation
- 1980-05-15 US US06/149,946 patent/US4305090A/en not_active Expired - Lifetime
- 1980-05-26 JP JP6907880A patent/JPS55158789A/ja active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4850635A (ja) * | 1971-10-27 | 1973-07-17 | ||
JPS494443A (ja) * | 1972-04-25 | 1974-01-16 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02125589A (ja) * | 1988-11-04 | 1990-05-14 | Fuji Photo Film Co Ltd | 撮像装置の画質補正方式 |
Also Published As
Publication number | Publication date |
---|---|
EP0019735B1 (de) | 1983-05-11 |
ATE3352T1 (de) | 1983-05-15 |
EP0019735A1 (de) | 1980-12-10 |
US4305090A (en) | 1981-12-08 |
DE2921246A1 (de) | 1980-12-04 |
JPH0316838B2 (ja) | 1991-03-06 |
DE3063060D1 (en) | 1983-06-16 |
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