JPS55153474A - Binary signal generating circuit - Google Patents

Binary signal generating circuit

Info

Publication number
JPS55153474A
JPS55153474A JP6175479A JP6175479A JPS55153474A JP S55153474 A JPS55153474 A JP S55153474A JP 6175479 A JP6175479 A JP 6175479A JP 6175479 A JP6175479 A JP 6175479A JP S55153474 A JPS55153474 A JP S55153474A
Authority
JP
Japan
Prior art keywords
voltage
binary signal
video signal
signal
given
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
JP6175479A
Other languages
Japanese (ja)
Inventor
Yojiro Sato
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP6175479A priority Critical patent/JPS55153474A/en
Publication of JPS55153474A publication Critical patent/JPS55153474A/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
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Abstract

PURPOSE:To enable to obtain excellent binary signal, even if no white part is present at the initial part of an original, by automatically setting a threshold voltage to a given voltage value if the threshold voltage to binarize a video signal is less than the specified value. CONSTITUTION:A video signal Sa read out from an image sensor IS is amplified A and the peak voltage of the video signal is held at a peak hold circuit PH, and a voltage Vs divided with a resistor VR is given to a comparator COMP as a reference voltage and it is compared with the signal Sa to obtain a binary signal of white and black level. If the voltage Vs is lower than the predetermined voltage value, a voltage Vf set at a minimum threshold set circuit LS is given to COMP as the reference voltage. Accordingly, even if no white part is present to a original corresponding to the initial part of the video signal read out from IS, an excellent binary signal is obtained.
JP6175479A 1979-05-19 1979-05-19 Binary signal generating circuit Pending JPS55153474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6175479A JPS55153474A (en) 1979-05-19 1979-05-19 Binary signal generating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6175479A JPS55153474A (en) 1979-05-19 1979-05-19 Binary signal generating circuit

Publications (1)

Publication Number Publication Date
JPS55153474A true JPS55153474A (en) 1980-11-29

Family

ID=13180254

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6175479A Pending JPS55153474A (en) 1979-05-19 1979-05-19 Binary signal generating circuit

Country Status (1)

Country Link
JP (1) JPS55153474A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63272261A (en) * 1987-04-30 1988-11-09 Mitsumi Electric Co Ltd Picture information reader

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5356918A (en) * 1976-11-01 1978-05-23 Oki Electric Ind Co Ltd Picture read system
JPS5453927A (en) * 1977-10-07 1979-04-27 Oki Electric Ind Co Ltd Optical character reader

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5356918A (en) * 1976-11-01 1978-05-23 Oki Electric Ind Co Ltd Picture read system
JPS5453927A (en) * 1977-10-07 1979-04-27 Oki Electric Ind Co Ltd Optical character reader

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63272261A (en) * 1987-04-30 1988-11-09 Mitsumi Electric Co Ltd Picture information reader

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