Minimum Requirements for Taxicab Security Cameras

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DOI: 10.4236/jtts.2014.43022    2,370 Downloads   2,988 Views  

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.

Cite this paper

Zeng, S. , Amandus, H. , Amendola, A. , Newbraugh, B. , Cantis, D. and Weaver, D. (2014) Minimum Requirements for Taxicab Security Cameras. Journal of Transportation Technologies, 4, 216-255. doi: 10.4236/jtts.2014.43022.

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