JPS5593373A - Processing circuit for video signal - Google Patents

Processing circuit for video signal

Info

Publication number
JPS5593373A
JPS5593373A JP75079A JP75079A JPS5593373A JP S5593373 A JPS5593373 A JP S5593373A JP 75079 A JP75079 A JP 75079A JP 75079 A JP75079 A JP 75079A JP S5593373 A JPS5593373 A JP S5593373A
Authority
JP
Japan
Prior art keywords
output
video signal
signal
comparator
circuit
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
JP75079A
Other languages
Japanese (ja)
Other versions
JPS5938791B2 (en
Inventor
Goro Izumi
Yoshikazu Yanagisawa
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP54000750A priority Critical patent/JPS5938791B2/en
Publication of JPS5593373A publication Critical patent/JPS5593373A/en
Publication of JPS5938791B2 publication Critical patent/JPS5938791B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Facsimile Image Signal Circuits (AREA)
  • Image Input (AREA)

Abstract

PURPOSE: To enable to discriminate small variation of video signal (small contrast) independent of dark and bright parts, by enabling to obtain fine conversion into white and black binary signal.
CONSTITUTION: The hold circuit 14 holds the minimum value of the video signal with "ON" of the switching element 24. The subtractor 15 detects the difference (VV-VH) between the video signal VV and the output VH of the hold circuit 14, and the output (VV-VH) is received at the first and second comparators 17 and 18. The second comparator 18 changes to "0" when the output of the subtractor is (VV-VH)>(-VS). The same operation is repeated. On the other hand, the comparator 28 compares the video signal VV with the reference voltage VB. Further, the output signal of the comparator 28 and the output signal from one output Q of FF circuit 22 are inputted to the AND circuit 29 to obtain the binary signal from the output terminal 30.
COPYRIGHT: (C)1980,JPO&Japio
JP54000750A 1979-01-10 1979-01-10 Image signal processing circuit Expired JPS5938791B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54000750A JPS5938791B2 (en) 1979-01-10 1979-01-10 Image signal processing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54000750A JPS5938791B2 (en) 1979-01-10 1979-01-10 Image signal processing circuit

Publications (2)

Publication Number Publication Date
JPS5593373A true JPS5593373A (en) 1980-07-15
JPS5938791B2 JPS5938791B2 (en) 1984-09-19

Family

ID=11482366

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54000750A Expired JPS5938791B2 (en) 1979-01-10 1979-01-10 Image signal processing circuit

Country Status (1)

Country Link
JP (1) JPS5938791B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62168288A (en) * 1986-01-21 1987-07-24 Nachi Fujikoshi Corp Automatic setting method for binarization slice value

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4966221A (en) * 1972-10-31 1974-06-27
JPS52120613A (en) * 1976-04-02 1977-10-11 Olympus Optical Co Ltd Video signal processing circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4966221A (en) * 1972-10-31 1974-06-27
JPS52120613A (en) * 1976-04-02 1977-10-11 Olympus Optical Co Ltd Video signal processing circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62168288A (en) * 1986-01-21 1987-07-24 Nachi Fujikoshi Corp Automatic setting method for binarization slice value

Also Published As

Publication number Publication date
JPS5938791B2 (en) 1984-09-19

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