JPS5780871A - Video signal binary circuit in photoelectric conversion system - Google Patents

Video signal binary circuit in photoelectric conversion system

Info

Publication number
JPS5780871A
JPS5780871A JP55156452A JP15645280A JPS5780871A JP S5780871 A JPS5780871 A JP S5780871A JP 55156452 A JP55156452 A JP 55156452A JP 15645280 A JP15645280 A JP 15645280A JP S5780871 A JPS5780871 A JP S5780871A
Authority
JP
Japan
Prior art keywords
peak value
video signal
level
comparator
inputted
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
JP55156452A
Other languages
Japanese (ja)
Inventor
Hiromitsu Momoki
Yasuo Inoue
Takahisa Ikeda
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55156452A priority Critical patent/JPS5780871A/en
Publication of JPS5780871A publication Critical patent/JPS5780871A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To prevent a white part in a black picture to obtain accurate picture information, by inhibiting a down clock, which lowers the peak value of a video signal, when this peak value is lowered to a certain voltage level. CONSTITUTION:The peak value level from an output terminal of a video signal binary LSI 21 is inputted to the - terminal of a comparator 22, and a level voltage divided by resistances is inputted to the + terminal. When the peak value voltage is lower than the comparison voltage, the comparator 22 outputs an H- level output to the output terminal. The output of the comparator 22 is inputted to one input of an OR circuit 23, and a down clock signal is inputted to the other input to inhibit the down clock for the H-level output of the comparator 22. Thus, the peak value is prevented from being lowered more than the comparison voltage to secure the black picture.
JP55156452A 1980-11-08 1980-11-08 Video signal binary circuit in photoelectric conversion system Pending JPS5780871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55156452A JPS5780871A (en) 1980-11-08 1980-11-08 Video signal binary circuit in photoelectric conversion system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55156452A JPS5780871A (en) 1980-11-08 1980-11-08 Video signal binary circuit in photoelectric conversion system

Publications (1)

Publication Number Publication Date
JPS5780871A true JPS5780871A (en) 1982-05-20

Family

ID=15628050

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55156452A Pending JPS5780871A (en) 1980-11-08 1980-11-08 Video signal binary circuit in photoelectric conversion system

Country Status (1)

Country Link
JP (1) JPS5780871A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027117A (en) * 1988-03-31 1991-06-25 Ricoh Company, Ltd. Conversion using a variable reference based on image density

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027117A (en) * 1988-03-31 1991-06-25 Ricoh Company, Ltd. Conversion using a variable reference based on image density

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