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Methods and apparatus for indirect illumination in electronic media rating systems

  • US 7,926,073 B2
  • Filed: 08/27/2010
  • Issued: 04/12/2011
  • Est. Priority Date: 06/08/2005
  • Status: Active Grant
First Claim
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1. A method to detect an audience member, the method comprising:

  • reflecting non-visible light off of a room surface to indirectly illuminate a first portion of a room;

    receiving reflections of the indirect illumination;

    processing the received reflections to determine whether an audience member is present in the illuminated portion of the room; and

    when the audience member is not detected, adjusting a source of the non-visible light to illuminate a second portion of the room.

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