JPS55151857A - Abc device for facsimile - Google Patents

Abc device for facsimile

Info

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
Application number
JP5975179A
Other languages
Japanese (ja)
Inventor
Keijiro Tsuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP5975179A priority Critical patent/JPS55151857A/en
Publication of JPS55151857A publication Critical patent/JPS55151857A/en
Pending legal-status Critical Current

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

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.
JP5975179A 1979-05-17 1979-05-17 Abc device for facsimile Pending JPS55151857A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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