JPS5564485A - Video subtraction unit - Google Patents

Video subtraction unit

Info

Publication number
JPS5564485A
JPS5564485A JP13796578A JP13796578A JPS5564485A JP S5564485 A JPS5564485 A JP S5564485A JP 13796578 A JP13796578 A JP 13796578A JP 13796578 A JP13796578 A JP 13796578A JP S5564485 A JPS5564485 A JP S5564485A
Authority
JP
Japan
Prior art keywords
subjects
video
circuit
pickup tube
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.)
Pending
Application number
JP13796578A
Other languages
Japanese (ja)
Inventor
Yoshikiyo Onishi
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 Denshi KK
Original Assignee
Hitachi Denshi KK
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 Denshi KK filed Critical Hitachi Denshi KK
Priority to JP13796578A priority Critical patent/JPS5564485A/en
Publication of JPS5564485A publication Critical patent/JPS5564485A/en
Pending legal-status Critical Current

Links

Landscapes

  • Apparatus For Radiation Diagnosis (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

PURPOSE: To obtain a video subtraction unit of simple constitution which projects two subjects on the same pickup tube alternatively and periodically.
CONSTITUTION: Two subjects 1a and 1b are projected on the same pickup tube PT by way of lenses 2a and 2b, and optical system 3. Light paths in optical system 3 is alternated at every horizontal scan by a rotating shutter, etc., driven synchronizing with a deflection circuit and images of two subjects are projected on pickup tube PT by turns. A video output having passed through video amplifier VA is separated by discriminator circuit DIS into video signals 1 and 2 of subjects 1a and 1b and signal 2 is applied to mixer circuit MIX together with signal 1 by way of delay circuit DL and polarity inverter circuit PIV. As a result, the same picture parts of subjects 1a and 1b are all erased and only different parts are outputted as a difference signal.
COPYRIGHT: (C)1980,JPO&Japio
JP13796578A 1978-11-10 1978-11-10 Video subtraction unit Pending JPS5564485A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13796578A JPS5564485A (en) 1978-11-10 1978-11-10 Video subtraction unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13796578A JPS5564485A (en) 1978-11-10 1978-11-10 Video subtraction unit

Publications (1)

Publication Number Publication Date
JPS5564485A true JPS5564485A (en) 1980-05-15

Family

ID=15210862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13796578A Pending JPS5564485A (en) 1978-11-10 1978-11-10 Video subtraction unit

Country Status (1)

Country Link
JP (1) JPS5564485A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5961386A (en) * 1982-09-30 1984-04-07 Toshiba Corp Picture correcting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5961386A (en) * 1982-09-30 1984-04-07 Toshiba Corp Picture correcting device

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