JPS5666969A - Multigradation recording facsimile equipment - Google Patents
Multigradation recording facsimile equipmentInfo
- Publication number
- JPS5666969A JPS5666969A JP14201879A JP14201879A JPS5666969A JP S5666969 A JPS5666969 A JP S5666969A JP 14201879 A JP14201879 A JP 14201879A JP 14201879 A JP14201879 A JP 14201879A JP S5666969 A JPS5666969 A JP S5666969A
- Authority
- JP
- Japan
- Prior art keywords
- level converting
- quantization level
- converting circuit
- circuit
- quantization
- 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
- H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
- H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To get rid of unstableness due to the environmental condition, by digitally correcting the characteristic of the photoelectric conversion part of the multigradation recording facsimile. CONSTITUTION:A light signal from the original 2 is converted to an electric signal by the photoelectric converter Sns, is quantized to (m) value by the A/D converter CONV through the buffer circuit BUF, and it is input to the quantization level converting circuit MEM. The (m) value quantization signal is converted to an (n) value quantization signal of m>n by the quantization level converting circuit MEM. This quantization level converting circuit is used for correcting the characteristic of the photoelectric converter SNS having nonlinearity, and consists of a digital circuit such as ROM which makes (m) the address and outputs (n), etc. Accordingly, this equipment is hard to be influenced by the environmental condition, stable and also inexpensive, comparing with using an analog circuit as its quantization level converting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14201879A JPS5666969A (en) | 1979-11-05 | 1979-11-05 | Multigradation recording facsimile equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14201879A JPS5666969A (en) | 1979-11-05 | 1979-11-05 | Multigradation recording facsimile equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5666969A true JPS5666969A (en) | 1981-06-05 |
Family
ID=15305450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14201879A Pending JPS5666969A (en) | 1979-11-05 | 1979-11-05 | Multigradation recording facsimile equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5666969A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4568955A (en) * | 1983-03-31 | 1986-02-04 | Tokyo Shibaura Denki Kabushiki Kaisha | Recording apparatus using a toner-fog generated by electric fields applied to electrodes on the surface of the developer carrier |
-
1979
- 1979-11-05 JP JP14201879A patent/JPS5666969A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4568955A (en) * | 1983-03-31 | 1986-02-04 | Tokyo Shibaura Denki Kabushiki Kaisha | Recording apparatus using a toner-fog generated by electric fields applied to electrodes on the surface of the developer carrier |
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