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 Title: |
US6455835:
System, method, and program product for acquiring accurate object silhouettes for shape recovery
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Bernardini, Fausto; New York, NY
Biermann, Henning; New York, NY
Rushmeier, Holly E.; Mount Kisco, NY
Savarese, Silvio; Pasadena, CA
Taubin, Gabriel; Hartsdale, NY
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| Assignee: |
International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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| Published / Filed: |
2002-09-24
/ 2001-04-04
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| Application Number: |
US2001000825685
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| IPC Code: |
Advanced:
G01B 11/24;
G06T 7/00;
Core:
more...
IPC-7:
H01L 27/00;
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| ECLA Code: |
G06T7/00R7C; G01B11/24G;
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| U.S. Class: |
250/208.1;
356/613;
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| Field of Search: |
250/208.1,201.5,201.7
382/203,204,131,154
356/390,391,613
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| Priority Number: |
| 2001-04-04 |
US2001000825685 |
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| Abstract: |
Disclosed are methods and apparatus for obtaining the shape of an object by observing silhouettes of the object. At least one point light source is placed in front of the object, thereby casting a shadow of the object on a translucent panel that is placed behind the object. A camera, or other imaging device, captures an image of the shadow from behind the translucent panel. The object's full silhouette is obtained from the image of the shadow as the region of the shadow is substantially darker than the region outside of the shadow. The full silhouette thus obtained may be processed by any suitable shape from silhouette algorithm, and thus objects are not limited in topological type. A color image of the object can optionally be obtained simultaneously with the shadow image using a camera placed on the same side of the object as the light source. Multiple silhouettes can be captured for one object position, reducing the number of rotations needed on a turntable system, and reducing the post-processing needed to register geometries obtained from multiple different positions.
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| Attorney, Agent or Firm: |
Ohlandt, Greeley, Ruggiero & Perle, LLP ;
Percello, Esq., Louis J. ;
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| Primary / Asst. Examiners: |
Le, Que T.;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Family: |
Show 3 known family members
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First Claim:
Show all 28 claims |
What is claimed is:
1. A method of obtaining a three dimensional image of an object, comprising the steps of:
- shining light from at least one light source on to the object from a first direction to create a first shadow cast by the object on a first surface of a translucent panel, where the object is disposed between a light source and the first surface of the translucent panel and has a first pose;
- obtaining a first digital image of the first shadow from a second, opposite surface of the translucent panel;
- changing the pose of the object and obtaining additional digital images of additional shadows cast by the object for different object poses; and
- processing the first and the additional digital images to create a three dimensional image of the object.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 8 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other References: |
"Volumetric Descriptions of Objects from Multiple Views," Martin et al., 1983 IEEE, 9 pp. (Month Unknown).
"Acquiring 3-D Models from Sequences of Contours," Jiang Yu Zheng, vol. 16, Feb. 1994, IEEE, pp. 163-178.
"How Far 3D Shapes Can Be Understood from 2D Silhouettes," Aldo Laurentini, vol. 17, No. 2, Feb. 1995, pp. 188-195.
"Efficient Representation of Object Shape for Silhouette Intersection," Jones et al., vol. 142, No. 6, Dec. 1995, IEE, pp. 359-365.
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