TY  - JOUR
PY  - 2014//
TI  - Minimum requirements for taxicab security cameras
JO  - Journal of transportation technologies (Irvine, Calif.)
A1  - Zeng, Shengke
A1  - Amandus, Harlan E.
A1  - Amendola, Alfred A.
A1  - Newbraugh, Bradley H.
A1  - Cantis, Douglas M.
A1  - Weaver, Darlene
SP  - 216
EP  - 255
VL  - 4
IS  - 3
N2  - 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>
LA  - en
SN  - 2160-0473
UR  - http://dx.doi.org/10.4236/jtts.2014.43022
ID  - ref1
ER  -