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METHODS FOR BACKGROUND SUBTRACTION USING FOCUS DIFFERENCES

  • US 20150093022A1
  • Filed: 12/08/2014
  • Published: 04/02/2015
  • Est. Priority Date: 10/31/2012
  • Status: Active Grant
First Claim
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1. A method, comprising steps of:

  • obtaining a first image and a second image, said first image having a first focal length and a first field of view, and said second image having a second focal length longer than said first focal length and a second field of view substantially identical to said first field of view;

    defining in said first and second images a plurality of element sets, each said element set comprising a first element of said first image and a substantially corresponding second element of said second image;

    comparing a relative degree of focus of said first and second elements in said element sets;

    assigning to a background category those element sets wherein said second element therein is at least as in-focus as said first element therein; and

    omitting from further evaluation any said element sets assigned to said background category.

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