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Method of producing traffic signal information, method of providing traffic signal information, and navigation apparatus

  • US 7,734,275 B2
  • Filed: 06/06/2008
  • Issued: 06/08/2010
  • Est. Priority Date: 07/09/2004
  • Status: Expired due to Fees
First Claim
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1. A method of producing traffic signal information, comprising:

  • taking, when a vehicle is closely approaching a traffic signal, an image of traffic signal lamps disposed on the traffic signal;

    producing image data of the traffic signal lamps based on the taken image;

    analyzing the image data;

    producing traffic signal state information, the traffic signal state information including a state of the traffic signal as of the time of taking the image of the traffic signal lamps;

    storing traffic signal information in a memory, the traffic signal information including the produced traffic signal state information, traffic signal location information, and time information; and

    performing a statistical analysis on a correlation in terms of the status of traffic signal lamps among a plurality of adjacent traffic signals based on plural pieces of traffic signal information of plural traffic signals.

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