JPS5571352A - Picture signal processing circuit - Google Patents
Picture signal processing circuitInfo
- Publication number
- JPS5571352A JPS5571352A JP14428778A JP14428778A JPS5571352A JP S5571352 A JPS5571352 A JP S5571352A JP 14428778 A JP14428778 A JP 14428778A JP 14428778 A JP14428778 A JP 14428778A JP S5571352 A JPS5571352 A JP S5571352A
- Authority
- JP
- Japan
- Prior art keywords
- white
- black
- signals
- picture signals
- voltage
- 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
Landscapes
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE: To process picture signals with a high precision even in case of fluctuation of white and black levels by detecting change quantities of black and white levels of picture signals outputted from a photoelectric converter circuit and converting small-contrast picture signals to high-precision black-and-white binary signals.
CONSTITUTION: The peak voltage of picture signals from a photoelectric converter circuit which are supplied to terminal 11 is detected by peak hold circuit 14, and the output is applied to reference voltage generating circuits 15 and 16 dependent upon voltage dividing resistances. Meanwhile, the change quantity in the amplitude direction corresponding to difference components between inputted picture signals and signals obtained by delaying them by delay circuit 12 is detected by operational amplifier 13. The change quantity from amplifier 13 is compared with the reference voltage and the polarity-inverted voltage of the reference voltage, which are generated by voltage generating circuits 15 and 16, by white-and-black binary set signal generating circuits 17∼19. Further, the change quantity from amplifier 13 is integrated by integrator circuit 20 and is compared by white-and-black binary set signal generating circuits 21∼22, and outputs of circuits 17∼22 are applied to bistable multivibrator 25 to output high-precision black-and-white binary signals.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14428778A JPS5571352A (en) | 1978-11-24 | 1978-11-24 | Picture signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14428778A JPS5571352A (en) | 1978-11-24 | 1978-11-24 | Picture signal processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5571352A true JPS5571352A (en) | 1980-05-29 |
Family
ID=15358553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14428778A Pending JPS5571352A (en) | 1978-11-24 | 1978-11-24 | Picture signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5571352A (en) |
-
1978
- 1978-11-24 JP JP14428778A patent/JPS5571352A/en active Pending
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