JPS5564485A - Video subtraction unit - Google Patents
Video subtraction unitInfo
- 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
Links
- 230000003287 optical effect Effects 0.000 abstract 2
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5961386A (en) * | 1982-09-30 | 1984-04-07 | Toshiba Corp | Picture correcting device |
-
1978
- 1978-11-10 JP JP13796578A patent/JPS5564485A/en active Pending
Cited By (1)
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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