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You searched on: Author: geraldine cheok Sorted by: title

Displaying records 11 to 20 of 90 records.
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11. Beam-to-Column Connections for Precast Concrete Moment-Resisting Frames
Published: 5/16/1994
Authors: Geraldine S Cheok, William C Stone, J Stanton, D Seagren
Abstract: Precast concrete frame construction is not used extensively in seismic regions of the USA. The UBC [ICBO, 1991] currently permits only certain specific building systems to be used and a precast frame is not one of them. The reason is that extensive r ...

12. Calibration Experiments of a Laser Scanner
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6922
Published: 9/1/2002
Authors: Geraldine S Cheok, Stefan D Leigh, Andrew L Rukhin
Abstract: The potential applications of laser scanners or LADARs (Laser Detection and Ranging) are numerous, and they cross several sectors of the industry construction, large-scale manufacturing, remote sensing, national defense. A LADAR is an instrument ...

13. Characterization of the Range Performance of a 3D Imaging System (NIST TN 1695)
Series: Technical Note (NIST TN)
Report Number: 1695
Published: 5/9/2011
Authors: Geraldine S Cheok, Kamel S Saidi, Marek Franaszek, James J Filliben, Nicholas Scott
Abstract: A 3D imaging instrument is a non-contact measurement instrument used to rapidly obtain 3D information about a scene or object. The use of and the applications for these instruments have grown tremendously in the last decade. The expanded use of 3D ...

14. 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 ...

15. Deconvolving LADAR Images Of Bar Codes for Construction Site Object Recognition
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7044
Published: 10/1/2003
Authors: David E. Gilsinn, Geraldine S Cheok, Dianne M O'Leary
Abstract: This report discusses a general approach to reconstructing ground truth intensity images of bar codes that have been distorted by LADAR optics. The first part of this report describes the experimental data collection of several bar code images along ...

16. Development and Use of the NIST Intelligent and Automated Construction Job Site Testbed
Series: Technical Note (NIST TN)
Report Number: 1726
Published: 12/16/2011
Authors: Kamel S Saidi, Geraldine S Cheok, Marek Franaszek, Christopher U Brown, Jeremy Swerdlow, Robert R Lipman, Itai Katz, Mani Golparvar-Fard, Paul Goodrum, Manu Akula, Gabriel Dadi, Behshad Ghadimi
Abstract: The Intelligent and Automated Construction Job Site (IACJS) Testbed is a large laboratory facility that was established at the National Institute of Standards and Technology (NIST) in 2011. The creation of the testbed was motivated by the need for su ...

17. 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 ...

18. Evaluation of an Acceptance Sampling Method for 2D/3D Building Plans Derived from 3D Imaging Data
Published: 12/1/2009
Authors: Geraldine S Cheok, Marek Franaszek, James J Filliben
Abstract: An acceptance sampling method, based on obtaining physical measurements, for accepting 2D building plans generated from 3D imaging data is evaluated and demonstrated using an actual GSA (General Services Administration) facility. The objective of th ...

19. Experiences with Point Cloud Registration
Published: 9/1/2002
Authors: Christoph Johann Witzgall, Geraldine S Cheok
Abstract: The development of LADAR (laser distance and ranging) technology to acquire 3D spatial data made it possible to create 3D models of complex objects. Because an unobstructed line-of-sight is required to capture a point on an object, an individual LAD ...

20. 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 ...

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