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Apparatus and method for acquiring differential image

  • US 10,051,195 B2
  • Filed: 10/29/2013
  • Issued: 08/14/2018
  • Est. Priority Date: 11/29/2012
  • Status: Active Grant
First Claim
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1. An apparatus for acquiring a differential image, comprising:

  • a camera configured to acquire a first image and a second image at the same point in time using an image sensor, wherein the image sensor includes;

    a first layer sensor for acquiring the first image including environment light and infrared polarized light from an illuminating unit;

    a second layer sensor for acquiring the second image including horizontal polarized light of the environment light;

    a polarizing filter, disposed between the first and second layer sensors, for blocking polarized light in the same direction as that of the infrared polarized light; and

    a processor coupled to the camera and configured to;

    correct brightnesses of background areas of the first and second images; and

    generate a differential image between the first and second images of which the brightnesses of the background areas are corrected,wherein the second layer sensor senses light passing through the polarizing filter to acquire the second image.

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