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Minimum requirements for taxicab security cameras.

Authors
Zeng-S; Amandus-HE; Amendola-AA; Newbraugh-BH; Cantis-DM; Weaver-D
Source
J Transp Technol 2014 Jul; 4(3):216-255
NIOSHTIC No.
20044829
Abstract
Problem: The homicide rate of taxicab-industry is 20 times greater than that of all workers. A NIOSH study showed that cities with taxicab-security cameras experienced significant reduction in taxicab driver homicides. Methods: Minimum technical requirements and a standard test protocol for taxicab-security cameras for effective taxicab-facial identification were determined. The study took more than 10,000 photographs of human-face charts in a simulated-taxicab with various photographic resolutions, dynamic ranges, lens-distortions, and motion-blurs in various light and cab-seat conditions. Thirteen volunteer photograph-evaluators evaluated these face photographs and voted for the minimum technical requirements for taxicab-security cameras. Results: Five worst-case scenario photographic image quality thresholds were suggested: the resolution of XGA-format, highlight-dynamic-range of 1 EV, twilight-dynamic-range of 3.3 EV, lens-distortion of 30%, and shutter-speed of 1/30 second. Practical Applications: These minimum requirements will help taxicab regulators and fleets to identify effective taxicab-security cameras, and help taxicabsecurity camera manufacturers to improve the camera facial identification capability.
Keywords
Motor-vehicles; Humans; Men; Women; Mortality-rates; Morbidity-rates; Safety-equipment; Safety-measures; Safety-practices; Photographic-equipment; Photography; Author Keywords: Taxicab Homicide; Facial Identification; Photographic Resolution; Dynamic Range; Lens Distortion; Motion Blur
Contact
Shengke Zeng, Division of Safety Research, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV
Publication Date
20140701
Document Type
Journal Article
Email Address
szeng@cdc.gov
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
M082014
Issue of Publication
3
ISSN
2160-0473
NIOSH Division
DSR
Priority Area
Healthcare and Social Assistance; Transportation, Warehousing and Utilities
Source Name
Journal of Transportation Technologies
State
WV
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