JPS6424681A - Sharpness improving device for video signal - Google Patents
Sharpness improving device for video signalInfo
- Publication number
- JPS6424681A JPS6424681A JP18270187A JP18270187A JPS6424681A JP S6424681 A JPS6424681 A JP S6424681A JP 18270187 A JP18270187 A JP 18270187A JP 18270187 A JP18270187 A JP 18270187A JP S6424681 A JPS6424681 A JP S6424681A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- respect
- video signal
- led
- switch 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
Abstract
PURPOSE:To improve the sharpness and definition of a video signal without causing saturation of an original signal by selecting and outputting an original video signal, a signal led timewise with respect thereto, and a signal lagged timewise depending on the changeover of a switch circuit corresponding to the rate of change in the amplitude of an original signal. CONSTITUTION:A signal f(t+D) led by time D with respect to an inputted video signal f(t), a signal f(t-D) lagged by a time D with respect to the signal f(t) and a signal f(t+k) led by a time K with respect to the signal f(t) are formed by delay circuits 1, 2, 3, a difference between the f(t+D), f(t-D), f(t+k) and the f(t) is obtained by subtractors 4, 5, 6 respectively and absolute values A, B, C of the respective amplitude difference are obtained by absolute value circuits 7, 8, 9. While the rate of change in the amplitude of the f(t) is small, the absolute value C is smaller than the preset value N and a switch circuit 10 selects the f(t) by a signal from a condition setting circuit 11. In case of C>N period, the switch circuit 10 selects f(t+D) at A<B, f(t) at A=B and f(t-D) at A>B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18270187A JPS6424681A (en) | 1987-07-21 | 1987-07-21 | Sharpness improving device for video signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18270187A JPS6424681A (en) | 1987-07-21 | 1987-07-21 | Sharpness improving device for video signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6424681A true JPS6424681A (en) | 1989-01-26 |
Family
ID=16122923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18270187A Pending JPS6424681A (en) | 1987-07-21 | 1987-07-21 | Sharpness improving device for video signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6424681A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4918528A (en) * | 1987-05-25 | 1990-04-17 | Mitsubishi Denki Kabushiki Kaisha | Contour correction device |
| JPH02200067A (en) * | 1989-01-30 | 1990-08-08 | Hitachi Ltd | Picture quality improving circuit |
| JPH037477A (en) * | 1989-06-05 | 1991-01-14 | Hitachi Ltd | Contour correction circuit |
| JPH04208778A (en) * | 1989-12-23 | 1992-07-30 | Samsung Electron Co Ltd | Method for correcting contour and circuit thereof |
-
1987
- 1987-07-21 JP JP18270187A patent/JPS6424681A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4918528A (en) * | 1987-05-25 | 1990-04-17 | Mitsubishi Denki Kabushiki Kaisha | Contour correction device |
| JPH02200067A (en) * | 1989-01-30 | 1990-08-08 | Hitachi Ltd | Picture quality improving circuit |
| JPH037477A (en) * | 1989-06-05 | 1991-01-14 | Hitachi Ltd | Contour correction circuit |
| JPH04208778A (en) * | 1989-12-23 | 1992-07-30 | Samsung Electron Co Ltd | Method for correcting contour and circuit thereof |
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