@article{ref1,
title="Minimum requirements for taxicab security cameras",
journal="Journal of transportation technologies (Irvine, Calif.)",
year="2014",
author="Zeng, Shengke and Amandus, Harlan E. and Amendola, Alfred A. and Newbraugh, Bradley H. and Cantis, Douglas M. and Weaver, Darlene",
volume="4",
number="3",
pages="216-255",
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. <br><br>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. <br><br>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 Taxicab Homicide, Facial Identification, Photographic Resolution, Dynamic Range, Lens Distortion, Motion Blur<p/> <p>Language: en</p>",
language="en",
issn="2160-0473",
doi="10.4236/jtts.2014.43022",
url="http://dx.doi.org/10.4236/jtts.2014.43022"
}