JPS55151857A - Abc device for facsimile - Google Patents
Abc device for facsimileInfo
- Publication number
- JPS55151857A JPS55151857A JP5975179A JP5975179A JPS55151857A JP S55151857 A JPS55151857 A JP S55151857A JP 5975179 A JP5975179 A JP 5975179A JP 5975179 A JP5975179 A JP 5975179A JP S55151857 A JPS55151857 A JP S55151857A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- amplifier
- gain
- original
- control
- 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 Heads (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To reduce the effect as little as possible to the reading sensitivity of the original at the time of facsimile transmission by giving the gain control to the amplifier according to the density of the platen, thus increasing the background density compensating effect. CONSTITUTION:The signal read through diode array 1 is applied to video amplifier 2 which can vary the gain, and the signal amplified through amplifier 2 is applied to one input of gate circuit 7. And the control is secured by control signal 10 having the timing corresponding to the original width applied to the other input of circuit 7, and the signal supplied from amplifier 2 is applied to integrator 5. Then the signal which referred faithfully to the background of the original which was ibtegrated by integrator 5 is applied to buffer 8. Then the gain of amplifier 2 is controlled by the output of buffer 8. Thus the signal is delivered to output terminal 11 after compensation given to the background density.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5975179A JPS55151857A (en) | 1979-05-17 | 1979-05-17 | Abc device for facsimile |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5975179A JPS55151857A (en) | 1979-05-17 | 1979-05-17 | Abc device for facsimile |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55151857A true JPS55151857A (en) | 1980-11-26 |
Family
ID=13122255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5975179A Pending JPS55151857A (en) | 1979-05-17 | 1979-05-17 | Abc device for facsimile |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55151857A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5814670A (en) * | 1981-07-20 | 1983-01-27 | Fuji Xerox Co Ltd | Image reader |
EP0254235A2 (en) * | 1986-07-18 | 1988-01-27 | Dainippon Screen Mfg. Co., Ltd. | Image data processing method and apparatus therefor |
JPS6348962A (en) * | 1986-08-19 | 1988-03-01 | Canon Inc | Image reading device |
-
1979
- 1979-05-17 JP JP5975179A patent/JPS55151857A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5814670A (en) * | 1981-07-20 | 1983-01-27 | Fuji Xerox Co Ltd | Image reader |
EP0254235A2 (en) * | 1986-07-18 | 1988-01-27 | Dainippon Screen Mfg. Co., Ltd. | Image data processing method and apparatus therefor |
JPS6348962A (en) * | 1986-08-19 | 1988-03-01 | Canon Inc | Image reading device |
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