JPS57132473A - Binary coding circuit for video signal - Google Patents

Binary coding circuit for video signal

Info

Publication number
JPS57132473A
JPS57132473A JP56017816A JP1781681A JPS57132473A JP S57132473 A JPS57132473 A JP S57132473A JP 56017816 A JP56017816 A JP 56017816A JP 1781681 A JP1781681 A JP 1781681A JP S57132473 A JPS57132473 A JP S57132473A
Authority
JP
Japan
Prior art keywords
circuit
comparator
output
video signal
signal
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.)
Granted
Application number
JP56017816A
Other languages
Japanese (ja)
Other versions
JPS6149872B2 (en
Inventor
Shoji Kamasako
Masaaki Arao
Norihiko Yoshimura
Yoshiyuki Ishiai
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP56017816A priority Critical patent/JPS57132473A/en
Publication of JPS57132473A publication Critical patent/JPS57132473A/en
Publication of JPS6149872B2 publication Critical patent/JPS6149872B2/ja
Granted 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)
  • Image Input (AREA)

Abstract

PURPOSE:To achieve a comparison output with a threshold level following to the level of read-in pattern due to contrast by a pencil and the like, by combining a plurality of comparison circuits, peak hold circuit and addition circuits. CONSTITUTION:A video signal of read-in pattern is inputted to a comparator 2, peak holding circuits 4, 5 and an analog delay circuit 10. The comparator 2 binary-codes an input video signal by denoting a reference voltage generated at a threshold value generating circuit 1 as a threshold level and outputs it to a distributor 3. The output of the distributor 3 makes the circuit 4 effective between the 2n-1-th rise to the 2n-th rise of the pulse waveform of the output of the comparator 2, and makes the circuit 5 ineffective between the 2n-the and the 2n+1-th. The output of the circuits 4, 5 is added at an adder 7 and inputted to a proportional device 12, then a threshold signal is obtained from the device 12. On the other hand, a video signal delayed for a prescribed time at the circuit 10 is given to a comparator 11, where the signal is compared with the threshold signal obtained at the circuit 12, and the objective binary coded signal as the output of the comparator 11 is obtained.
JP56017816A 1981-02-09 1981-02-09 Binary coding circuit for video signal Granted JPS57132473A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56017816A JPS57132473A (en) 1981-02-09 1981-02-09 Binary coding circuit for video signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56017816A JPS57132473A (en) 1981-02-09 1981-02-09 Binary coding circuit for video signal

Publications (2)

Publication Number Publication Date
JPS57132473A true JPS57132473A (en) 1982-08-16
JPS6149872B2 JPS6149872B2 (en) 1986-10-31

Family

ID=11954255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56017816A Granted JPS57132473A (en) 1981-02-09 1981-02-09 Binary coding circuit for video signal

Country Status (1)

Country Link
JP (1) JPS57132473A (en)

Also Published As

Publication number Publication date
JPS6149872B2 (en) 1986-10-31

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