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Object detection from image profiles within sequences of acquired digital images

  • US 8,587,666 B2
  • Filed: 02/15/2011
  • Issued: 11/19/2013
  • Est. Priority Date: 02/15/2011
  • Status: Active Grant
First Claim
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1. Within an image acquisition device, a method of determining moving objects in integral projection vectors, comprising:

  • acquiring a sequence of image frames;

    determining a measure of frame-to-frame rotation, including;

    performing a global XY alignment of a first frame and second, following frame of said image sequence;

    determining at least one section of each of the X and Y integral projection vectors where aligned global vectors demonstrate a significant localized difference; and

    based on X and Y locations of said at least one section of the X and Y integral projection vectors, determining location, relative velocity or approximate area, or combinations thereof, of at least one moving object within the sequence of image frames; and

    performing a further action based on the determined location, relative velocity or approximate area, or combinations thereof, of the at least one moving object; and

    the method further comprises;

    determining horizontal and vertical integral projection vector gradients for each of the same or a different first frame and the same or a different second, following, image frame in said sequence;

    normalizing said integral projection vector gradients; and

    determining locations of primary maximum and minimum peaks of said integral projection vector gradients; and

    determining a global rotation based on normalized distances between the primary maximum and minimum peaks, andwherein the further action is also based on said determined global rotation.

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