Patent US4714545A successfully refreshed from Google Patents.
Patent US3602573A successfully refreshed from Google Patents.
US3602573A
Expired / Lapsed
US
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Color analysis optical surveillance system
Assignee: United States Department of the Navy
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Filing: 1968-05-15
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Granted: 1971-08-31
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Expires: 1988-05-15
Abstract
Abstract An optical system for improving target visibility comprising a prism which separates light reflected from the scene into its various color wavelengths and a set of cross polarized color polarized filters capable of rotation with respect to the prism to provide color contrast enhancement.
Inventors
- 👤 David W Kermode
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:22
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3083
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
An optical surveillance system which reduces the effect of camouflage and increases target visibility comprising: prism means, means for collecting the light reflected from the scene under surveillance and directing the light to said prism, so that light rays arriving at the prism from adjacent points are not parallel to each other; said prism means separating said light collected into its various color components and forming new hues due to overlapping of color components caused by prism dispersion of light arriving from adjacent points; and means for color polarizing said overlapping light components to change the relative contrast of the target with respect to its background.
Claim 2
Dependent Claim
106 words
An optical surveillance system which reduces the effect of camouflage and increases target visibility comprising: prism means, means for collecting the light reflected from the scene under surveillance and directing the light to said prism, so that light rays arriving at the prism from adjacent points are not parallel to each other; said prism means separating said light collected into its various color components and forming new hues due to overlapping of color components caused by prism dispersion of light arriving from adjacent points; and means for color polarizing said overlapping light components to change the relative contrast of the target with respect to its background.
Claim 3
Dependent Claim
19 words
The system of claim 1 wherein: the color polarizing means are capable of rotation with respect to said prism.
Claim 4
Dependent Claim
58 words
The system of claim 2 wherein: the rotatable color polarizing means comprise: a first polarized filter having color sensitivity to only a first color; a second polarized filter having color sensitivity to only a second color; and the direction of light polarization of said first filter is perpendiculAr to the direction of light polarization of said second filter.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |