Patent US3934082A successfully refreshed from Google Patents.
US3934082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Post detection device for eliminating backscatter
Assignee: United States Department of the Navy
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Filing: 1974-08-12
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Granted: 1976-01-20
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Expires: 1994-08-12
Abstract
Abstract The deleterious effects of backscattering on a video image received from aurbid environment is minimized by using a vertical raster scan combined with appropriate filtering between the camera and monitor.
Inventors
- 👤 Alan Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:29
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
In a method for remote viewing in an underwater environment having high backscatter employing a television camera, illumination means displaced from said television camera, the improvement comprising: causing the raster lines of said television camera to extend in a vertical direction at right angles to the direction of displacement of said illumination source from said television camera; filtering the output of said television camera to prevent the passage of low frequencies; and causing the raster lines of a monitor receiver effectively connected to said television camera to extend in the same direction as those of the camera, whereby backscatter from the illumination source is effectively reduced.
Claim 2
Dependent Claim
106 words
In a method for remote viewing in an underwater environment having high backscatter employing a television camera, illumination means displaced from said television camera, the improvement comprising: causing the raster lines of said television camera to extend in a vertical direction at right angles to the direction of displacement of said illumination source from said television camera; filtering the output of said television camera to prevent the passage of low frequencies; and causing the raster lines of a monitor receiver effectively connected to said television camera to extend in the same direction as those of the camera, whereby backscatter from the illumination source is effectively reduced.
Claim 3
Dependent Claim
82 words
A remote viewing system for environments having high backscatter comprising: an underwater television camera displaced from a source of illumination for eliminating backscatter having raster lines extending in a vertical direction at right angles to the direction of displacement; a filter connected to the camera to limit the frequency output thereof to a predetermined bandwidth; and a monitor connected to said filter to display the filtered output thereof and having a raster corresponding to said television camera including vertically extending raster lines.
Claim 4
Dependent Claim
82 words
A remote viewing system for environments having high backscatter comprising: an underwater television camera displaced from a source of illumination for eliminating backscatter having raster lines extending in a vertical direction at right angles to the direction of displacement; a filter connected to the camera to limit the frequency output thereof to a predetermined bandwidth; and a monitor connected to said filter to display the filtered output thereof and having a raster corresponding to said television camera including vertically extending raster lines.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |