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You searched on: Author: geraldine cheok

Displaying records 61 to 70 of 86 records.
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61. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860429

62. Reconstructing Images of Bar Codes for Construction Site Object Recognition
Published: 9/1/2002
Authors: David E. Gilsinn, Geraldine S Cheok, Dianne M O'Leary
Abstract: This paper discusses a general approach to reconstructing ground truth intensity images of bar codes that have been distorted by LADARoptics. The first part of this paper describes the experimental data collection of several bar code images along w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150859

63. Object Identification Using Bar Codes Based on LADAR Intensity
Published: 9/1/2001
Authors: William C Stone, Geraldine S Cheok, K M Furlani, David E. Gilsinn
Abstract: Tests of a novel concept for tracking construction components were carried out at the National Institute of Standards and Technology. The approach makes use of laser radar and retro-reflective barcodes attached to manufactured building materials. T ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860365

64. LADAR Sensing Applications for Construction
Series: OTHER
Published: 6/1/2001
Authors: Geraldine S Cheok, William C Stone
Abstract: One potential breakthrough technology that stands to revolutionize construction surveying and status monitoring is known as laser range imaging. The device used to obtain the field data is known as a LADAR (Laser Distance and Ranging). With LADAR i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909353

65. Registering 3D Point Clouds: An Experimental Evaluation
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6743
Published: 5/1/2001
Authors: Christoph Johann Witzgall, Geraldine S Cheok
Abstract: Four separate laser scans of a wooden box, taken from different vantage points, were examined in a laboratory setting. Visual and numerical registration methods, aimed at aligning the individual scan data with respect to a common frame, were explore ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860351

66. Laser Scanning for Construction Metrology
Published: 3/1/2001
Authors: Geraldine S Cheok, William C Stone, Robert R Lipman, Christoph Johann Witzgall, Javier Bernal
Abstract: This paper summarizes work at the National Institute of Standards and Technology (NIST) in the Non-Intrusive Scanning Technologies for Construction Assessment Project. It will briefly describe the initial proof-of-concept phase of this project, the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860748

67. Field Demonstration of Laser Scanning for Excavation Measurement
Published: 10/1/2000
Authors: Geraldine S Cheok, Robert R Lipman, Christoph Johann Witzgall, Javier Bernal, William C Stone
Abstract: The use of a scanning laser to measure terrain changes due to excavation at a construction site is described. The objective at this phase of the project is to develop the tools necessary to measure terrain changes in real-time. This paper focuses o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860744

68. Performance of Precast Concrete Shear Walls
Published: 7/1/2000
Authors: A E Schultz, Geraldine S Cheok, R A Magana
Abstract: An experimental program is undertaken to enhance the knowledge base regarding seismic design of precast concrete shear walls. The emulation design and jointed design philosophies are described, and an idealization of the behavior of precast shear wal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860130

69. Automated Earthmoving Status Determination
Published: 2/28/2000
Authors: William C Stone, Geraldine S Cheok, Robert R Lipman
Abstract: Efforts are underway at the National Institute of Standards and Technology (NIST) to develop automated non-intrusive production measurement systems and procedures for monitoring the status of general earthmoving operations at typical construction sit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860215

70. Ladars for Construction Assessment and Update
Published: 1/1/2000
Authors: Geraldine S Cheok, William C Stone, Robert R Lipman, Christoph Johann Witzgall
Abstract: Work at the National Institute of Standards and Technology (NIST) on laser radar imaging of a construction site is described. The objective of the NIST research is to make measurements required in a construction project quicker and cheaper than curr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860226



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