JPS5546621A - Shading correction circuit - Google Patents
Shading correction circuitInfo
- Publication number
- JPS5546621A JPS5546621A JP11952478A JP11952478A JPS5546621A JP S5546621 A JPS5546621 A JP S5546621A JP 11952478 A JP11952478 A JP 11952478A JP 11952478 A JP11952478 A JP 11952478A JP S5546621 A JPS5546621 A JP S5546621A
- Authority
- JP
- Japan
- Prior art keywords
- shading correction
- amplifier
- contrast
- brightness
- synthesizer 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.)
- Pending
Links
- 238000003705 background correction Methods 0.000 title abstract 4
Landscapes
- Picture Signal Circuits (AREA)
Abstract
PURPOSE: To obtain a picture with a uniform contrast and brightness by changing the gain of a video signal system in accordance with a shading correction signal.
CONSTITUTION: Horizontal driving pulse HD and vertical driving pulse VD are passed through saw-tooth wave forming circuits 1 and 2 and parabolic wave forming circuits 3 and 4, and signal synthesizer circuit 5 outputs a shading correction signal. This output is applied to variable gain amplifier 9, inserted into the input side of signal synthesizer circuit 7 of a video signal system, through amplifier 8 so as to control amplifier 9, thereby improving amplitude (contrast). The shading correction signal, on the other hand, is applied through amplifier 6 to synthesizer circuit 7, thus to improve brightness. In this way,shading is corrected effectively to obtain a picture uniform in contrast and in brightness.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11952478A JPS5546621A (en) | 1978-09-28 | 1978-09-28 | Shading correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11952478A JPS5546621A (en) | 1978-09-28 | 1978-09-28 | Shading correction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5546621A true JPS5546621A (en) | 1980-04-01 |
Family
ID=14763402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11952478A Pending JPS5546621A (en) | 1978-09-28 | 1978-09-28 | Shading correction circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5546621A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128922A (en) * | 1979-03-28 | 1980-10-06 | Fuji Electric Co Ltd | Binary coding circuit |
| US4523229A (en) * | 1981-06-15 | 1985-06-11 | Ricoh Company, Ltd. | Shading correction device |
| US4731652A (en) * | 1986-03-25 | 1988-03-15 | Kabushiki Kaisha Toshiba | Shading correction signal generating device for a television camera apparatus |
-
1978
- 1978-09-28 JP JP11952478A patent/JPS5546621A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128922A (en) * | 1979-03-28 | 1980-10-06 | Fuji Electric Co Ltd | Binary coding circuit |
| US4523229A (en) * | 1981-06-15 | 1985-06-11 | Ricoh Company, Ltd. | Shading correction device |
| US4731652A (en) * | 1986-03-25 | 1988-03-15 | Kabushiki Kaisha Toshiba | Shading correction signal generating device for a television camera apparatus |
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