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| Digital-analog converter |
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| Method and device for controlling radiation |
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| Teletype compatible facsimile recorder |
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| Magnetic recording head assembly support with a sinuous gimbal spring |
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Method and apparatus for determining surface profile and/or surface strain
| Details |
Inventors: Manthey, David W.; Lee, Daeyong;
Assignee: CamSys, Inc. (Troy, NY)
Primary Examiner: Voeltz; Emanuel T.
Assistant Examiner: Vo; Hien
Attorney, Agent or Firm: Heslin & Rothenberg, P.C., Reinke, Esq.; Wayne F.
A photogrammetry target (cube or other shape of known dimension with reference points in known relation to each other) is placed on or in close proximity to a surface for which surface profile and/or surface strain are to be measured. Identifiable reference points are applied to the surface of interest, and multiple images of the surface with photogrammetry target are taken. At least some of the reference points on the photogrammetry target and the surface of interest must be visible in each image. The surface profile and/or surface strain are determined from the images based on the reference points therein. The determination is made by determining two-dimensional coordinates for each visible reference point in each image, correlating the two-dimensional coordinates for the images, determining, for each image, a distance between a vantage point for obtaining the image and the photogrammetry target, and determining, for each image, three-dimensional coordinates for each visible reference point on the surface of interest based on the correlated two-dimensional coordinates and the determined distance. The images are obtained by a digital camera, and the surface profile and/or surface strain determination is made by a computer. |
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DETAILED DESCRIPTION Briefly, the present invention satisfies the need for an improved vision-based approach to determining surface profile and/or surface strain with portable equipment by providing a photogrammetry target placed on or in close proximity to the surface of interest prior to obtaining images thereof.
Since the dimensions of the photogrammetry target are known, and the target includes known reference points, the need for stationary equipment is eliminated.
In accordance with the above, it is an object of the present invention to provide a vision-based approach to determining attributes of a surface of interest.
It is another object of the present invention to provide a vision-based approach to determining an attribute of a surface without knowledge of the location of the image-obtaining equipment with respect to the surface of interest.
It is a further object of the present invention to provide portable apparatus for a vision-based approach to determining an attribute of a surface.
The present invention provides, in a first aspect, a method of determining an attribute of a surface.
The method comprises steps of applying a first plurality of identifiable reference points to the surface, placing a photogrammetry target on or in close proximity to the surface, the photogrammetry target including a second plurality of identifiable reference points, obtaining at least two images of the surface with the photogrammetry target, each image including at least some of the first and second plurality of reference points, and determining, from the at least two images, the attribute based on the reference points included in the images.
The present invention provides, in a second aspect, apparatus for determining an attribute of a surface, comprising means for applying a first plurality of identifiable reference points to the surface, a photogrammetry target for placing on or in close proximity to the surface, the photogrammetry target including a second plurality of identifiable reference points, means for obtaining at least two images of the surface with the photogrammetry target, each image including at least some of the first and second plurality of reference points and having a different orientation, and means for determining, from the images, the attribute based on the reference points in the images
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Image Analysis 
