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US3781467A
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Method and apparatus for measuring the length of elongate features having a substantially common orientation employing line scanning
Assignee: Image Analysing Computers Ltd
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Filing: 1972-04-27
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Granted: 1973-12-25
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Expires: 1992-04-27
Abstract
Abstract A method and apparatus is described for measuring the length of elongate features having a substantially common orientation in which a video signal is obtained by line scanning and measurements are made on the video signal of electrical pulses derived therefrom by detection. Contrary to conventional practice the method of the invention proposes that the field containing the features be orientated so that the features are perpendicular to the direction of line scanning. The length measurement is then obtained by counting the number of line scan intersections with a feature.
Inventors
- 👤 M Soames
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:27
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A method of analysing a field of substantially parallel elongated features comprising the steps of, scanning the field in a series of parallel equally spaced lines to produce a video signal thereof, orientating the field so that the length direction of said features is substantially perpendicular to the direction of line scanning, detecting the amplitude excursions of said video signal which correspond to line scan intersections with said features, generating detected signal pulses from said detected amplitude excursions and, counting the number of said detected signal pulses.
Claim 2
Independent Claim
87 words
A method of analysing a field of substantially parallel elongated features comprising the steps of, scanning the field in a series of parallel equally spaced lines to produce a video signal thereof, orientating the field so that the length direction of said features is substantially perpendicular to the direction of line scanning, detecting the amplitude excursions of said video signal which correspond to line scan intersections with said features, generating detected signal pulses from said detected amplitude excursions and, counting the number of said detected signal pulses.
Claim 3
Dependent Claim
32 words
A method as set forth in claim 1 further comprising the steps of, counting the number of detected features, and dividing the number of detected signal pulses by the number of features.
Claim 4
Dependent Claim
31 words
A method as set forth in claim 1 further comprising the step of isolating the detected signal pulses relating to one feature in the field by means of a light pen.
Claim 5
Dependent Claim
54 words
A method as set forth in claim 1 further comprising the steps of, differentiating the detected signal pulses to produce a first pulse corresponding to the leading edge of each detected pulse and a second pulse corresponding to the trailing edge of each detected pulse, removing said first pulses, and counting said second pulses.
Claim 6
Dependent Claim
54 words
A method as set forth in claim 1 further comprising the steps of, differentiating the detected signal pulses to produce a first pulse corresponding To the leading edge of each detected pulse and a second pulse corresponding to the trailing edge of each detected pulse, removing said second pulses, and counting said first pulses.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |