文章基本信息

标题：Minimum Requirements for Taxicab Security Cameras
本地全文：下载
作者：Shengke Zeng ; Harlan E. Amandus ; Alfred A. Amendola 等
期刊名称：Journal of Transportation Technologies
印刷版ISSN：2160-0473
电子版ISSN：2160-0481
出版年度：2014
卷号：04
期号：03
页码：216-255
DOI：10.4236/jtts.2014.43022
语种：English
出版社：Scientific Research Publishing
摘要：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.
关键词：Taxicab Homicide; Facial Identification; Photographic Resolution; Dynamic Range; Lens Distortion; Motion Blur