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Author: geraldine cheok

Displaying records 21 to 30 of 82 records.
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21. Fitting Spheres to Range Data from 3D Imaging Systems
Published: 10/1/2009
Authors: Marek Franaszek, Geraldine S Cheok, Kamel Shawki Saidi, Christoph Johann Witzgall
Abstract: Two error functions used for nonlinear Least Squares (LS) fitting of spheres to range data from 3D imaging systems are discussed: orthogonal error function and directional error function. Both of the functions allow unrestricted gradient-based minimi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861541

22. Gauging the Repeatability of 3D Imaging Systems by Sphere Fitting
Published: 9/30/2009
Authors: Marek Franaszek, Geraldine S Cheok, Kamel Shawki Saidi
Abstract: Multiple scans of the same object acquired with 3D imaging system (e.g., laser scanner) in the same experimental conditions could provide valuable information about the instrument s performance (e.g., stability, existence of bias, measurement error). ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903444

23. Guidelines for Accepting 2D Building Plans (NIST IR 7638)
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7638
Published: 9/30/2009
Authors: Geraldine S Cheok, James J Filliben, Alan M. (Alan M.) Lytle
Abstract: The General Services Administration's (GSA) Public Buildings Services manages 1600 buildings totaling 180, 000, 000 square feet. GSA‰s ability to capture, validate, and report the spatial information of its building assets (e.g., dimensions, areas, a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903918

24. Target Penetration of Laser-Based 3D Imaging Systems
Published: 1/19/2009
Authors: Geraldine S Cheok, Kamel Shawki Saidi, Marek Franaszek
Abstract: The ASTM E57.02 Test Methods Subcommittee is developing a test method to evaluate the ranging performance of a 3D imaging system. The test method will involve either measuring the distance between two targets or between an instrument and a target. Th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909346

25. Guidelines for Accepting 2D Building Plans
Series: OTHER
Published: 12/10/2008
Author: Geraldine S Cheok
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901054

26. Proceedings of IS&T/SPIE 21st Annual Symposium on Electronic Imaging 2009 - 3D Imaging Metrology Conference
Published: 11/5/2008
Authors: Geraldine S Cheok, Kamel Shawki Saidi, Marek Franaszek
Abstract: The ASTM E57.02 Test Methods Subcommittee is developing a test method to evaluate the ranging performance of a 3D imaging system. The test method will involve either measuring the distance between two targets or between an instrument and a target. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900883

27. ASTM E57 - 3D Imaging Systems
Published: 6/4/2008
Authors: Geraldine S Cheok, Alan M. (Alan M.) Lytle, Kamel Shawki Saidi
Abstract: As the applications for 3D imaging systems continue to grow, the need for standards to evaluate these systems has become more critical. The ASTM E57 3D Imaging committee established in 2006 was formed specifically to develop standard terminology ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861567

28. ASTM E-57 3D Imaging Systems Committee: An Update
Published: 3/19/2008
Authors: Alan M. (Alan M.) Lytle, Geraldine S Cheok, Kamel Shawki Saidi
Abstract: In 2006, ASTM committee E57 was established to develop standards for the performance evaluation of 3D imaging systems. The committee's initial focus is on standards for 3D imaging systems typically used for applications including, but not limited t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860707

29. ASTM E57 3D Imaging Systems Committee: An Update
Published: 3/19/2008
Authors: Geraldine S Cheok, Alan M. (Alan M.) Lytle, Kamel Shawki 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

30. 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



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