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Determining proximity of a mobile device to a subject based on shadow analysis

  • US 9,336,599 B2
  • Filed: 03/17/2015
  • Issued: 05/10/2016
  • Est. Priority Date: 06/23/2010
  • Status: Expired due to Fees
First Claim
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1. A cell phone comprising:

  • a camera for capturing images and video;

    memory for buffering captured images and video;

    means for identifying a shadow cast by the cell phone on a subject being imaged by said camera by analyzing buffered captured images and video; and

    means for determining proximity from the cell phone to the subject based on the identified shadow.

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