Comparison of two different processing methods on accuracy in abnormal incident detection

Since 1994, the Metropolitan Expressway Public Corporation (MEPC) has been experimenting and examining abnormal incident detection systems which employ image processing technology. Because the influences of a vehicular accident on the following vehicles are so great, the MEPC is looking into the introduction of such systems into Metropolitan Expressway with top priority given to the tunnel sections of the expressway. In 1997, MEPC introduced an abnormal incident detection system into the Chiyoda, Kasumigaseki, Kuko-Kita, and Tokyo-Ko Tunnels, on a trial basis, by making the best use of existing CCTV cameras. As regards the tunnel sections, as well as bright roadway sections in which the number of accidents is relatively great, MEPC makes it a rule to adopt a constant processing method for the system to be introduced, in which one image processing unit (IPU) constantly handles images from only one camera. It can be said that the constant processing method is ideal in terms of speed and reliability in the detection of an abnormal incident. However, due to the fact that MEPC have already installed nearly 1,000 CCTV cameras throughout the road network of the expressway and in view of future plans to introduce the system into all the routes of the expressway, an enormous cost of system introduction is nothing but a headache to the Corporation. Therefore, MEPC are looking into the adoption of a switchover processing method in which two or more cameras are handled by only one IPU. The drawback of this switchover processing method is that it has some delay in detecting an incident as compared with the constant processing method. To minimize this delay, MEPC are looking into the adoption of a variable cycle method. The authors conducted verification testing on both the variable and fixed cycle methods, analyzed the results of the tests comparatively, and confirmed the superiority of the variable cycle method to the fixed cycle method as reported in this paper.


  • English

Media Info

  • Pagination: 11p

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Filing Info

  • Accession Number: 01393852
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 23 2012 9:49AM