Minimum Requirements for Taxicab Security Cameras*

Details

• Alternative Title:
  J Transp Technol
• Personal Author:
  Zeng, Shengke ; Amandus, Harlan E. ; Amendola, Alfred A. ; Newbraugh, Bradley H. ; Cantis, Douglas M. ; Weaver, Darlene
• 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.
  
  
• Subjects:
  Article Dynamic Range Facial Identification Lens Distortion Motion Blur Photographic Resolution Taxicab Homicide
• Source:
  J Transp Technol. 4(3):216-255.
• Pubmed ID:
  26823992
• Pubmed Central ID:
  PMC4727178
• Document Type:
  Journal Article
• Funding:
  CC999999/Intramural CDC HHS/United States
• Volume:
  4
• Issue:
  3
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha256:6553fe85bf0fd2afd58e4aa75889aa635eb1e3d0171acb66e960a63e85b37106
• Download URL:
  https://stacks.cdc.gov/view/cdc/37801/cdc_37801_DS1.pdf
• File Type:
  [PDF - 3.63 MB ]