JPS6439184A - Enhancing circuit - Google Patents
Enhancing circuitInfo
- Publication number
- JPS6439184A JPS6439184A JP62195072A JP19507287A JPS6439184A JP S6439184 A JPS6439184 A JP S6439184A JP 62195072 A JP62195072 A JP 62195072A JP 19507287 A JP19507287 A JP 19507287A JP S6439184 A JPS6439184 A JP S6439184A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- color difference
- circuit
- passing
- changed
- 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 execute an enhancement without a malfunction and an S/N deterioration at the flatted part of a signal waveform by detecting the amplitude change of a luminance signal and subtracting a secondary differential signal of a color difference signal from the original color difference signal during only the detection period. CONSTITUTION:A band control signal (c) by passing an input luminance signal (a) through an LPF2 is obtained, the signal is differentiated at a differentiation circuit 3 and a signal (d) is obtained. When the signal (d) is present, the amplitude of the signal (a) is changed and the color difference signal is also changed. A signal (e) detecting the signal (d) is supplied to a comparator 5 in order that an output (f) is not generated at a minute level by setting a threshold level. On the other hand, the time of signals (g) and (c) is set by passing an input signal (b) through a delay circuit 7. The signal (g) is inputted to a secondary differentiation circuit 8 to obtain the secondary differential signal (h). A switch circuit 10 is switched by the output (f), the circuit 10 is turned on only the period when the luminance signal is changed, an enhanced color difference signal (j) is obtained by subtracting a passing signal (i) from the signal (g) and the signal is outputted from an output terminal 11.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62195072A JPS6439184A (en) | 1987-08-04 | 1987-08-04 | Enhancing circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62195072A JPS6439184A (en) | 1987-08-04 | 1987-08-04 | Enhancing circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6439184A true JPS6439184A (en) | 1989-02-09 |
Family
ID=16335088
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62195072A Pending JPS6439184A (en) | 1987-08-04 | 1987-08-04 | Enhancing circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6439184A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3644928C2 (en) * | 1985-03-23 | 1989-07-13 | Mitsubishi Paper Mills, Ltd., Tokio/Tokyo, Jp |
-
1987
- 1987-08-04 JP JP62195072A patent/JPS6439184A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3644928C2 (en) * | 1985-03-23 | 1989-07-13 | Mitsubishi Paper Mills, Ltd., Tokio/Tokyo, Jp |
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