JPS57208767A - Binary device for video signal - Google Patents
Binary device for video signalInfo
- Publication number
- JPS57208767A JPS57208767A JP9379981A JP9379981A JPS57208767A JP S57208767 A JPS57208767 A JP S57208767A JP 9379981 A JP9379981 A JP 9379981A JP 9379981 A JP9379981 A JP 9379981A JP S57208767 A JPS57208767 A JP S57208767A
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- scanning period
- binary
- determining
- threshold level
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Manipulation Of Pulses (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To determine a suitable threshold level independently of the fluctuation of amount of light and lightness of an objective, by determining the threshold level for binary coding, and a peak value in a video signal at preceding scanning period, as reference values. CONSTITUTION:A video signal from a photo electric converting element 17 is amplified through an amplifier 18 to obtain a video signal 5. Peak hold circuits 20a and 20b are alternately operated with a switching device 19 to hold the peak value in one horizontal scanning period. Two switching devices 19 and 21 are synchronized and switched by one horizontal scanning period as a period. The video signal 5 and a threshold value 29 thus determined are compared at a comparator 24 to output a binary signal 25 from the result. The adjustment of a voltage generated from an adjusting voltage generating circuit 22 can be made by comparing an original picture with an obtained binary picture and determining a voltage so as to make both analogue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9379981A JPS57208767A (en) | 1981-06-19 | 1981-06-19 | Binary device for video signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9379981A JPS57208767A (en) | 1981-06-19 | 1981-06-19 | Binary device for video signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57208767A true JPS57208767A (en) | 1982-12-21 |
Family
ID=14092459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9379981A Pending JPS57208767A (en) | 1981-06-19 | 1981-06-19 | Binary device for video signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57208767A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59189784A (en) * | 1983-04-12 | 1984-10-27 | Canon Inc | Picture signal processing device |
| JPS61277286A (en) * | 1985-05-31 | 1986-12-08 | Fuji Electric Co Ltd | Adaptive binary-coding circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5345115A (en) * | 1976-10-06 | 1978-04-22 | Hitachi Denshi Ltd | Binary circuit |
| JPS5350943A (en) * | 1976-10-20 | 1978-05-09 | Sumitomo Electric Ind Ltd | Binary circuit for analog signal |
-
1981
- 1981-06-19 JP JP9379981A patent/JPS57208767A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5345115A (en) * | 1976-10-06 | 1978-04-22 | Hitachi Denshi Ltd | Binary circuit |
| JPS5350943A (en) * | 1976-10-20 | 1978-05-09 | Sumitomo Electric Ind Ltd | Binary circuit for analog signal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59189784A (en) * | 1983-04-12 | 1984-10-27 | Canon Inc | Picture signal processing device |
| JPS61277286A (en) * | 1985-05-31 | 1986-12-08 | Fuji Electric Co Ltd | Adaptive binary-coding circuit |
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