%0 Journal Article
%T Minimum Requirements for Taxicab Security Cameras
%A Shengke Zeng
%A Harlan E. Amandus
%A Alfred A. Amendola
%A Bradley H. Newbraugh
%A Douglas M. Cantis
%A Darlene Weaver
%J Journal of Transportation Technologies
%P 216-255
%@ 2160-0481
%D 2014
%I Scientific Research Publishing
%R 10.4236/jtts.2014.43022
%X <p class=\"MsoNormal\" style=\"text-align:justify;\">
	<span lang=\"TR\" style=\"font-family:Verdana;\">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. </span><span lang=\"EN-US\" style=\"font-family:Verdana;\">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.</span> 
</p>
%K Taxicab Homicide
%K Facial Identification
%K Photographic Resolution
%K Dynamic Range
%K Lens Distortion
%K Motion Blur
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=48347