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You searched on: Author: geraldine cheok

Displaying records 31 to 40 of 84 records.
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31. ASTM E57 3D Imaging Systems Committee: An Update
Published: 3/19/2008
Authors: Geraldine S Cheok, Alan M. (Alan M.) Lytle, Kamel S Saidi
Abstract: In 2006, an ASTM committee (E57) was established to develop standards for the performance evaluation of 3D imaging systems. The initial focus for the committee is on standards for 3D imaging systems typically used for applications including, but not ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861489

32. Fast automatic registration of range images from 3D imaging systems using sphere targets
Published: 1/1/2008
Authors: Marek Franaszek, Geraldine S Cheok, Christoph Johann Witzgall
Abstract: 3D imaging systems are line of sight instruments and multiple scans from different locations are often needed to get a good representation of an entire scene. Therefore, registration of different datasets to a common coordinate system is required. A ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860690

33. Evaluating a Ranging Protocol For 3D Imaging Systems
Published: 9/19/2007
Authors: Geraldine S Cheok, Kamel S Saidi, Alan M. (Alan M.) Lytle
Abstract: In 2006, the ASTM E57 committee was established to develop standards for 3D imaging systems. A 3D imaging system is a non-contact instrument that is used to measure the range and bearing to and/or the 3D coordinates of points on an object or within ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860713

34. Using LADAR to Characterize the 3-D Shape of Aggregates: Preliminary Results.
Published: 12/1/2006
Authors: Edward Joseph Garboczi, Geraldine S Cheok, William C Stone
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=101172

35. Proceedings of the 3rd NIST Workshop on the Performance Evaluation of 3D Imaging Systems, March 2-3, 2006
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7357
Published: 10/1/2006
Author: Geraldine S Cheok
Abstract: Two 3D Imaging Systems Performance Evaluation Workshops have been held at the National Institute of Standards and Technology (NIST) the first in 2003 and the second in 2005. These workshops were conducted in an effort to determine the need for sta ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860682

36. Recovering Circles and Spheres from Point Data
Published: 7/1/2006
Authors: Christoph Johann Witzgall, Geraldine S Cheok, Anthony J Kearsley
Abstract: Methods for fitting circles and spheres to point sets are discussed. LADAR (LAser Detection And Ranging) scanners, in particular, are capable of generating "point clouds" containing the x, y, z coordinates of up to several millions of points reflecti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50826

37. Recovering Spheres from 3D Point Data
Published: 4/1/2006
Authors: Christoph Johann Witzgall, Geraldine S Cheok, Anthony J Kearsley
Abstract: The National Institute of Standards and Technology is involved in developing standard protocols for the performance evaluation of 3D imaging systems, which include laser scanners and LADARs (LAser Detection and Ranging). A LADAR is an optical device ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50949

38. Using LADAR to characterize the 3-D shape of aggregates: Preliminary results
Published: 3/1/2006
Authors: Edward Joseph Garboczi, Geraldine S Cheok, William C Stone
Abstract: In previous publications, we have shown how using x-ray computed tomography to obtain the raw 3-D data for the coordinates of the surface, and then converting this raw data into an analytical function for the surface via an expansion in spherical har ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860569

39. Status of the NIST 3D Imaging System Performance Evaluation Facility
Published: 1/1/2006
Authors: Geraldine S Cheok, Alan M. (Alan M.) Lytle, Kamel S Saidi
Abstract: This paper will present the status of the indoor artifact-based Performance Evaluation Facility at the National Institute of Standards and Technology (NIST) for 3D imaging systems. This facility will be used to develop test protocols and performance ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860649

40. Construction Object Identification from LADAR Scans: An Experimental Study Using I-Beams
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7286
Published: 12/15/2005
Authors: David E. Gilsinn, Geraldine S Cheok, Christoph Johann Witzgall, Alan M. (Alan M.) Lytle
Abstract: Laser Scanning devices (LADAR for Laser Detection and Ranging) are used in construction projects to capture as-built data. They can rapidly generate large unstructured point clouds. This study describes an experiment in which an I-beam on a concrete ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50817



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