US4899061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Determining a width and/or thickness of a generally rectangular object
Assignee: The Broken Hill Proprietary Company Pty Ltd
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Filing: 1987-07-27
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Granted: 1990-02-06
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Expires: 2007-07-27
Abstract
Abstract At least two cameras (10,12) view two points (A,B) displaced by a known distance on an article (S). Using a known relationship between two points (A,B) and the known position of cameras (10,12) in space the location of the viewed points (A,B) in space are determined by calculation. Similarly, the coordinates of other points on to article (S) are determined and hence dimensions such as width are determined.
Inventors
- 👤 Hendrik C. Van Hoek
- 👤 Daryl N. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:35
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/02; G01B11/024
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
176 words
A method of determining a dimension of an article, said method comprising the steps of: viewing four points on the article with a sensing means to obtain image positions of said four points, said four points comprising first and second pairs of points being displaced by known relationships; using the known relationships between the first pair of points and the image positions of the first pair of points to determine a location in space of one of said first pair of points; using the known relationships between the second pair of points and the image positions of the second pair of points to determine a location in space of one of said second pair of points; and using the location in space of the said one point of the first pair of points and the location in space of the said one point of the second pair of points to determine a dimension of said article between said one point of the first pair of points and said one point of the second pair of points.
Claim 2
Independent Claim
176 words
A method of determining a dimension of an article, said method comprising the steps of: viewing four points on the article with a sensing means to obtain image positions of said four points, said four points comprising first and second pairs of points being displaced by known relationships; using the known relationships between the first pair of points and the image positions of the first pair of points to determine a location in space of one of said first pair of points; using the known relationships between the second pair of points and the image positions of the second pair of points to determine a location in space of one of said second pair of points; and using the location in space of the said one point of the first pair of points and the location in space of the said one point of the second pair of points to determine a dimension of said article between said one point of the first pair of points and said one point of the second pair of points.
Claim 3
Dependent Claim
39 words
The method of claim 1, wherein a first pair of sensing means each one viewing one of the first pair of points and a second pair of sensing means each one viewing one of the second pair of points.
Claim 4
Dependent Claim
65 words
The method of claim 2, wherein said first pair of sensing means are used with one of said sensing means viewing one of the first pair of points and viewing one of the second pair of points and the other of said pair of sensing means viewing the other of the first pair of points and viewing the other of the second pair of points.
Claim 5
Dependent Claim
31 words
The method of claim 1, wherein the four points comprise points at the edges of a generally rectangular cross-sectioned article and the known relationships comprise the known thickness of the article.
Claim 6
Dependent Claim
89 words
The method of claim 1, wherein the location of the first pair of points (x a , Y a ); (x a , Y a-b ) are derived from the following equations wherein, x c , Y c are calibration constants, θ is the angle of a ray drawn from principal point of the sensing means to the object coordinate with respect to the X axis, and the subscript 1, 2 denote the respective sensing means; y.sub.a =tan θ.sub.1 (x.sub.a -X.sub.c1)+Y.sub.c1 (iii) y.sub.a -t=tan θ.sub.2 (x.sub.a -X.sub.c2)+Y.sub.2 (iv) ##EQU4##
Claim 7
Dependent Claim
37 words
The method of claim 1, wherein the first and second pair of points are on arcs of circles of curved portions of the article and the known relationships are the radius of the arcs of the circles.
Claim 8
Independent Claim
165 words
An apparatus for determining a dimension of an article, said apparatus comprising: sensing means for sensing a first and a second pair of points on said article and for providing image positions of said points, the first and second pair of points being displaced by known relationships; and processing means, coupled to said sensing means, for resolving a location in space of one of said first pair of points from said known relationships between the first pair of points and the image positions of the first pair of points, said processing means also for resolving a location in space of one of the points of the second pair of points from the known relationships between the second pair of points and the image positions of the second pair of points, said processing means for determining a distance between one point of the first pair of points and one point of the second pair of points to enable a dimension of the article to be determined.
Claim 9
Independent Claim
165 words
An apparatus for determining a dimension of an article, said apparatus comprising: sensing means for sensing a first and a second pair of points on said article and for providing image positions of said points, the first and second pair of points being displaced by known relationships; and processing means, coupled to said sensing means, for resolving a location in space of one of said first pair of points from said known relationships between the first pair of points and the image positions of the first pair of points, said processing means also for resolving a location in space of one of the points of the second pair of points from the known relationships between the second pair of points and the image positions of the second pair of points, said processing means for determining a distance between one point of the first pair of points and one point of the second pair of points to enable a dimension of the article to be determined.
References Cited (Backward Citations)
US4319270A
Cited
US4381152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |