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Systems and methods for capturing images using a mobile device

  • US 9,160,946 B1
  • Filed: 01/21/2015
  • Issued: 10/13/2015
  • Est. Priority Date: 01/21/2015
  • Status: Active Grant
First Claim
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1. A method for controlling a camera of a mobile device to automatically capture images of a rectangular object, the method comprising:

  • capturing a low resolution image of the rectangular object;

    detecting edges of the rectangular object in the low resolution image, the edges forming a quadrangle;

    calculating a coordinate of each corner of the quadrangle;

    calculating an average coordinate of each corner of the quadrangle in a most recent predetermined number of low resolution images;

    calculating a dispersion of each corner of the quadrangle in the most recent predetermined number of low resolution images from a corresponding coordinate of each calculated average coordinate;

    determining whether the dispersion of each corner of the quadrangle is less than a predetermined value;

    capturing a high resolution image of the rectangular object when it is determined that the dispersion of each corner of the quadrangle is less than the predetermined value; and

    geometrically transforming the quadrangle of the rectangular object in the high resolution image into a rectangle.

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