Patent US4206365A successfully refreshed from Google Patents.
US4206365A
Expired / Lapsed
US
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Optical correlator
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1978-05-26
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Granted: 1980-06-03
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Expires: 1998-05-26
Abstract
Abstract The invention relates to an optical correlator comprising an optical system for imaging an object space, a spatial frequency filter disposed in or close by the image plane, and at least one photoelectric detector assigned to said spatial frequency filter. According to the invention the spatial frequency filter is a raster, the structures of which extend in the direction of the perspective vanishing lines of the image of the object space and/or perpendicularly to at least one of said vanishing lines. The size of the structure elements and/or the distance between the elements constituting the raster structure are chosen according to the distortion of the perspective image.
Inventors
- 👤 Ludwig Leitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:12
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/0012; G01; G01P; G01P13/00; G01P3/00; G01P3/36; G01P3/64; G01P3/80; G01P3/806; G02B27/42; G02B27/46
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
81 words
An optical correlator having an imaging optic for imaging an object space having lines vanishing in the direction of the horizon into an image plane and a spatial frequency filter arranged substantially in said image plane and at least one photoelectric detector assigned to said spatial frequency filter, wherein the improvement comprises: said spatial frequency filter in the form of a raster having structure elements which extend in said direction of the vanishing lines of the image of the object space.
Claim 2
Dependent Claim
81 words
An optical correlator having an imaging optic for imaging an object space having lines vanishing in the direction of the horizon into an image plane and a spatial frequency filter arranged substantially in said image plane and at least one photoelectric detector assigned to said spatial frequency filter, wherein the improvement comprises: said spatial frequency filter in the form of a raster having structure elements which extend in said direction of the vanishing lines of the image of the object space.
Claim 3
Dependent Claim
25 words
An optical correlator as claimed in claim 1, wherein the raster structure elements extend in the direction of the vanishing lines of a central perspective.
Claim 4
Dependent Claim
36 words
An optical correlator as claimed in claim 2, wherein the spatial frequency filter is pivotable about an axis which extends substantially normal to the image plane and substantially intersects the vanishing point of the central perspective.
Claim 5
Dependent Claim
19 words
An optical correlator as claimed in claim 1, wherein at least portions of the structure elements are photoelectric detectors.
Claim 6
Dependent Claim
86 words
An optical correlator having an imaging optic for imaging an object space having lines vanishing in the direction of the horizon into an image plane and a spatial frequency filter arranged substantially in said image plane and at least one photoelectric detector assigned to said spatial frequency filter, wherein the improvement comprises: said spatial frequency filter in the form of a raster having structure elements which extend in a direction perpendicular to at least one of said vanishing lines of the image of the object space.
Claim 7
Dependent Claim
86 words
An optical correlator having an imaging optic for imaging an object space having lines vanishing in the direction of the horizon into an image plane and a spatial frequency filter arranged substantially in said image plane and at least one photoelectric detector assigned to said spatial frequency filter, wherein the improvement comprises: said spatial frequency filter in the form of a raster having structure elements which extend in a direction perpendicular to at least one of said vanishing lines of the image of the object space.
Claim 8
Dependent Claim
19 words
An optical correlator as claimed in claim 5, wherein at least portions of the structure elements are photoelectric detectors.
Claim 9
Dependent Claim
30 words
An optical correlator as claimed in claim 5, wherein the vanishing lines to which the structure elements extend in a perpendicular direction are the vanishing lines of a central perspective.
Claim 10
Dependent Claim
36 words
An optical correlator as claimed in claim 7, wherein the spatial frequency filter is pivotable about an axis which extends substantially normal to the image plane and substantially intersects the vanishing point of the central perspective.
Claim 11
Dependent Claim
112 words
An optical correlator having an imaging optic for imaging an object space having lines vanishing in the direction of the horizon into an image plane and a spatial frequency filter arranged substantially in said image plane and at least one photoelectric detector assigned to said spatial frequency filter, wherein the improvement comprises: said spatial frequency filter in the form of a single raster having structure elements with a first part of said structure elements which extends in the direction of said vanishing lines of the image of the object space and a second part of said structure elements which extends in a direction perpendicularly to at least one of said vanishing lines.
Claim 12
Dependent Claim
112 words
An optical correlator having an imaging optic for imaging an object space having lines vanishing in the direction of the horizon into an image plane and a spatial frequency filter arranged substantially in said image plane and at least one photoelectric detector assigned to said spatial frequency filter, wherein the improvement comprises: said spatial frequency filter in the form of a single raster having structure elements with a first part of said structure elements which extends in the direction of said vanishing lines of the image of the object space and a second part of said structure elements which extends in a direction perpendicularly to at least one of said vanishing lines.
Claim 13
Dependent Claim
25 words
An optical correlator as claimed in claim 9, wherein the raster structure elements extend in the direction of the vanishing lines of a central perspective.
Claim 14
Dependent Claim
36 words
An optical correlator as claimed in claim 10, wherein the spatial frequency filter is pivotable about an axis which extends substantially normal to the image plane and substantially intersects the vanishing point of the central perspective.
Claim 15
Dependent Claim
19 words
An optical correlator as claimed in claim 9, wherein at least portions of the structure elements are photoelectric detectors.
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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |