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System and method for determining the state of a traffic signal

  • US 8,692,996 B2
  • Filed: 07/28/2011
  • Issued: 04/08/2014
  • Est. Priority Date: 07/28/2011
  • Status: Active Grant
First Claim
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1. A traffic signal state detector, comprising:

  • a lens;

    a color sensor configured to identify a plurality of colors of light directed to the color sensor by the lens;

    an aperture plate disposed between the lens and the color sensor, the aperture plate comprising an aperture having a shape and orientation corresponding to a traffic signal to be monitored by the traffic signal state detector, wherein the lens is configured to focus gathered light at the aperture; and

    a processor coupled to the color sensor, the processor configured to;

    determine a color of light emitted by the traffic signal based on the colors of light identified by the color sensor; and

    anticipate a change in state of the traffic signal based on a determined timing of previous state changes of the traffic signal.

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