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Shadow detection in images

  • US 20070110309A1
  • Filed: 11/17/2005
  • Published: 05/17/2007
  • Est. Priority Date: 11/17/2005
  • Status: Active Grant
First Claim
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1. A process comprising:

  • capturing a reference image;

    capturing a current image;

    calculating reference image to current image object plus shadow ratios (RTOPS);

    calculating reference image to current image object ratios (RTO);

    calculating reference image to current image shadow ratios (RTS);

    calculating an average RTOPS ratio;

    calculating an average RTO ratio;

    calculating an average RTS ratio;

    calculating a first range using said RTOPS, RTO, and RTS ratios; and

    identifying a pixel as being under a shadow by multiplying a lower limit of said first range by said average RTOPS ratio and multiplying an upper limit of said first range by said average RTOPS ratio, thereby giving a second range; and

    determining whether said pixel falls within said second range.

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