Minimum Requirements for Taxicab Security Cameras*

Zeng, Shengke; Amandus, Harlan E.; Amendola, Alfred A.; Newbraugh, Bradley H.; Cantis, Douglas M.; Weaver, Darlene

doi:10.4236/jtts.2014.43022

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Minimum Requirements for Taxicab Security Cameras*

Published Date:

Jul 2014

Publisher's site:

http://dx.doi.org/10.4236/jtts.2014.43022 New Site Icon

Source:

J Transp Technol. 4(3):216-255.

[PDF-3.63 MB]

Details:

Personal Authors:

Zeng, Shengke ; Amandus, Harlan E. ; Amendola, Alfred A. ; Newbraugh, Bradley H. ; Cantis, Douglas M. ; ... More ▼

Keywords:

[+]

Pubmed ID:

26823992

Pubmed Central ID:

PMC4727178

Description:

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 taxicab-security camera manufacturers to improve the camera facial identification capability.

Document Type:

Journal Article

Collection(s):

CDC Public Access

Funding:

CC999999/Intramural CDC HHS/United States

Supporting Files:

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