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Mobile document detection and orientation based on reference object characteristics

  • US 9,760,788 B2
  • Filed: 10/29/2015
  • Issued: 09/12/2017
  • Est. Priority Date: 10/30/2014
  • Status: Active Grant
First Claim
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1. A computer-implemented method for processing a digital image depicting a document, the method comprising:

  • analyzing, using a processor of a mobile device, the digital image to detect one or more of a presence and a location of one or more reference objects;

    detecting, using the processor of the mobile device, one or more geometric characteristics of at least one of the reference objects, wherein the one or more geometric characteristics are selected from;

    a height of the at least one of the reference objects, an average height of the at least one of the reference objects, a width of the at least one of the reference objects, an average width of the at least one of the reference objects, an aspect ratio of the at least one of the reference objects, an average aspect ratio of the at least one of the reference objects, an area of the at least one of the reference objects, an average area of the at least one of the reference objects, and a contour of the at least one of the reference objects;

    defining, using the processor of the mobile device, one or more region(s) of interest of the digital image within which to search for one or more edges of the document, the region(s) of interest being defined based at least in part on one or more of the detected geometric characteristics; and

    detecting, using the processor of the mobile device, a presence or an absence of one or more of the edges of the document within each defined region of interest;

    estimating a bounding box for the document based on the detected presence or absence of the edge of the document within each defined region of interest; and

    estimating a confidence score of the bounding box based on one or more of;

    confidence scores computed for each side of the bounding box;

    a confidence score of an estimated aspect ratio of the bounding box; and

    a color consistency confidence score.

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