Patent US3726997A successfully refreshed from Google Patents.
US3726997A
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US
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Optical processing system
Assignee: Calspan Corp
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Filing: 1969-02-26
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Granted: 1973-04-10
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Expires: 1989-02-26
Abstract
Abstract An optical processing system for detecting the presence of certain shapes in a scene, having a bipolar aperture mask, a lens, a television camera located beyond the focal plane of the lens, a stripped mask adjacent the camera; the aperture mask has portions, corresponding to the shape to be detected, of dissimilar optical properties, and adjacent strips of the stripped mask have respective optical properties corresponding to that of each of the respective portions of the aperture mask.
Inventors
- 👤 D Gnau
- 👤 B Pierstorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:28
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/88
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
178 words
An optical processing system, comprising; a. a scene containing various shapes, one class of which is to be detected, b. lens means for imaging said scene, including a bipolar aperture mask having portions of dissimilar optical properties, each generally corresponding in shape to the shape of said class to be detected, c. detection means located in a position spaced from the focal plane of said lens means for developing an output signal in response to the optical output of said lens means, d. a stripped mask, each of the adjacent strips of which have respective optical properties corresponding to that of each of the respective portions of said bipolar aperture mask, e. delay means responsive to the output signal from said detection means for developing a delayed output signal, f. subtraction means responsive to the output signal from said detection means and the delayed output signal from said delay means for developing a difference signal, and g. detector means responsive to said difference signal for developing an output signal indicative of the class of shapes to be detected.
Claim 2
Dependent Claim
178 words
An optical processing system, comprising; a. a scene containing various shapes, one class of which is to be detected, b. lens means for imaging said scene, including a bipolar aperture mask having portions of dissimilar optical properties, each generally corresponding in shape to the shape of said class to be detected, c. detection means located in a position spaced from the focal plane of said lens means for developing an output signal in response to the optical output of said lens means, d. a stripped mask, each of the adjacent strips of which have respective optical properties corresponding to that of each of the respective portions of said bipolar aperture mask, e. delay means responsive to the output signal from said detection means for developing a delayed output signal, f. subtraction means responsive to the output signal from said detection means and the delayed output signal from said delay means for developing a difference signal, and g. detector means responsive to said difference signal for developing an output signal indicative of the class of shapes to be detected.
Claim 3
Dependent Claim
14 words
The system according to claim 1, wherein; h. said optical properties are color transmissivities.
Claim 4
Dependent Claim
14 words
The system according to claim 1, wherein; h. said optical properties are polarization planes.
Claim 5
Dependent Claim
29 words
The system according to claim 1, wherein; h. said detection means comprises a television camera, and i. said stripped mask is located adjacent the face of said television camera.
References Cited (Backward Citations)
US3211898A
Cited
US3413735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |