NDLI: Telescope Aiming Point Tracking Method for Bioptic Driving Surveillance

Content Provider	IEEE Xplore Digital Library
Author	Xianping Fu Gang Luo Eli Peli
Copyright Year	2001
Abstract	A bioptic telescope is a visual aid used by people with impaired vision when driving in many U.S. states, though bioptic driving remains controversial. Objective data on how and when bioptic drivers use the telescope and what they look at with it are crucial to understanding the bioptic telescope's effects on driving. A video-based technique to track the telescope's aiming point is presented in this paper. With three infrared retro-reflective markers pasted on the bioptic spectacles frame, its movement is recorded using an infrared camera unit with infrared LED illuminators. The angles formed by the three markers are used to calculate the telescope's aiming points, which are registered with road scene images recorded by another camera. The calculation is based on a novel one-time calibration method, in which the light spot from a head-mounted laser pointer projected on a wall while the scanning is recorded by the scene camera, in synchronization with the infrared camera. Interpolation is performed within small local regions where no samples were taken. Thus, nonlinear interpolation error can be minimized, even for wide-range tracking. Experiments demonstrated that the average error over a 70° × 48° field was only 0.86°, with lateral head movement allowed.
Sponsorship	IEEE Engineering in Medicine and Biology Society
Page Count	9
File Size	3043460
Starting Page	628
Ending Page	636
File Format	PDF
ISSN	15344320
Volume Number	18
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-12-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Telescopes Surveillance Cameras Head Roads Layout Interpolation Lenses Light emitting diodes Calibration vision rehabilitation Bioptic driving head tracking instrumented vehicle low vision
Content Type	Text
Resource Type	Article
Subject	Neuroscience Rehabilitation Internal Medicine Biomedical Engineering Computer Science Applications

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