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Evaluation of Lens Distortion Errors Using an Underwater Camera System for Video-Based Motion Analysis

Evaluation of Lens Distortion Errors Using an Underwater Camera System for Video-Based Motion Analysis

          
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About the Book

Video-based motion analysis systems are widely employed to study human movement, using computers to capture, store, process, and analyze video data. This data can be collected in any environment where cameras can be located. One of the NASA facilities where human performance research is conducted is the Weightless Environment Training Facility (WETF), a pool of water which simulates zero-gravity with neutral buoyance. Underwater video collection in the WETF poses some unique problems. This project evaluates the error caused by the lens distortion of the WETF cameras. A grid of points of known dimensions was constructed and videotaped using a video vault underwater system. Recorded images were played back on a VCR and a personal computer grabbed and stored the images on disk. These images were then digitized to give calculated coordinates for the grid points. Errors were calculated as the distance from the known coordinates of the points to the calculated coordinates. It was demonstrated that errors from lens distortion could be as high as 8 percent. By avoiding the outermost regions of a wide-angle lens, the error can be kept smaller. Poliner, Jeffrey and Fletcher, Lauren and Klute, Glenn K. Johnson Space Center NASA-TM-104795, S-769, NAS 1.15:104795 ...


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Product Details
  • ISBN-13: 9781792702419
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 279 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1792702418
  • Publisher Date: 31 Dec 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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