Patent US3602592A successfully refreshed from Google Patents.
US3602592A
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Production of a modified orthophotograph
Assignee: Canadian Patents and Development Ltd
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Filing: 1967-09-05
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Granted: 1971-08-31
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Expires: 1987-09-05
Abstract
Abstract A three-dimensional optical model is created from a stereo-pair of aerial photographs by projecting the photographs by means of two projectors, and a moving aperture scans the optical model. A photosensitive film is exposed to one of these beams and is shifted in a direction perpendicular to the plane of the film so that the portion of film that is being exposed intersects the optical model. Superimposed on the vertical shift motion of the film is a displacement tangential to the plane of the film, the amount of displacement being in a preselected relationship to the extent of the vertical shift.
Inventors
- 👤 Stanley Hoover Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:27
CPC Classifications
G; G01; G01C; G01C11/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A method of producing a modified orthophotograph for stereointerpretation, said method comprising a. obtaining from two photographs of aN object forming a stereopair with each other the X-, Y- and Z-coordinates and information concerning the image of each detail of said object to generate data corresponding to a true orthophotograph of said object, b. modifying said data by varying the value of each X-coordinate of said data by an amount depending on the value of the corresponding said Z-coordinate and, c. forming said modified orthophotograph from said modified data.
Claim 2
Independent Claim
89 words
A method of producing a modified orthophotograph for stereointerpretation, said method comprising a. obtaining from two photographs of aN object forming a stereopair with each other the X-, Y- and Z-coordinates and information concerning the image of each detail of said object to generate data corresponding to a true orthophotograph of said object, b. modifying said data by varying the value of each X-coordinate of said data by an amount depending on the value of the corresponding said Z-coordinate and, c. forming said modified orthophotograph from said modified data.
Claim 3
Dependent Claim
141 words
A method according to claim 1, wherein said data obtaining and generating step comprises i. projecting said photographs to create a three-dimensional optical model of said object and to cause areas of one of said photographs small in comparison with the total area thereof to be successively projected onto successive portions of a photosensitive film, and ii. moving said film relative to said one photograph with a shift perpendicular to said film to effect at least optically apparent intersection of each one of said film portions with said optical model; wherein said modifying step (b) comprises moving said film with a displacement tangential to said film, the amount of said displacement being dependent on the amount of said shift; and wherein said forming step (c) comprises exposing said film portions to the light projecting each said area of said one photograph.
Claim 4
Dependent Claim
19 words
A method according to claim 2, wherein said intersection is produced by forming said optical model at said film.
Claim 5
Dependent Claim
51 words
A method according to claim 2, wherein said intersection is produced by forming said optical model as a virtual one appearing in an optical system remote from said film and by causing said shift of said film to move said virtual optical model relatively to a mark in said optical system.
Claim 6
Dependent Claim
41 words
A method according to claim 2, wherein said exposing step comprises moving continuously an aperture defining said film portions in adjacent traces parallel to a scanning direction across said film and wherein said displacement is a translation in said scanning direction.
Claim 7
Dependent Claim
37 words
A method according to claim 2, wherein said tangential displacement of the film is a translation in a direction parallel to the image of the direction extending between the two positions from which the photographs were taken.
Claim 8
Dependent Claim
187 words
A method according to claim 1, wherein said data obtaining and generating step (a) comprises i. successively projecting from a first source of light corresponding areas of each of said photographs small in comparison with the total area thereof onto a respective one of a pair of photosensitive cells, said first source of light being placed at successively varying said X- and Y-coordinates in a first plane, said plane and both said photographs being parallel to one another, ii. determining the parallax in the X-direction between the two representations of each detail depicted in said corresponding areas to generate a signal representing each of said Z-coordinates and iii. applying said signal to shift said first light source perpendicularly to said photographs; and wherein said forming step (c) comprises iv. varying the intensity of a second source of light in accordance with the output signal of one of said cells, v. placing said second source of light at each said modified X-coordinate and at each said Y-coordinate of a second plane, vi. exposing to said second source of light a photosensitive film disposed parallel to said second plane.
Claim 9
Dependent Claim
29 words
A method according to claim 7, wherein said X-coordinates define a direction parallel to the image of the direction extending between the positions from which the photographs were taken.
Claim 10
Dependent Claim
28 words
A method according to claim 1, wherein the amount of variation of the value of each X-coordinate is linearly related to the value of the corresponding said Z-coordinate.
Claim 11
Dependent Claim
28 words
A method according to claim 1, wherein the amount of variation of the value of each X-coordinate is logarithmically related to the value of the corresponding said Z-coordinate.
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 |