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Image processing for launch parameters measurement of objects in flight

  • US 9,171,211 B2
  • Filed: 09/20/2013
  • Issued: 10/27/2015
  • Est. Priority Date: 09/20/2013
  • Status: Active Grant
First Claim
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1. A method of measuring launch parameters of an object in flight, the method comprising:

  • capturing a plurality of images of an object in flight;

    identifying a radius of the object and a center of the object in each of the plurality of images;

    calculating a velocity, an elevation angle, and an azimuth angle based on the radius of the object, the center of the object, and pre-measured camera alignment values;

    cropping the plurality of images to a smallest square that bounds the object;

    flattening the plurality of images from spherical representations to Cartesian representations;

    converting the Cartesian representations to polar coordinates with a range of candidate centers of rotation; and

    based on a fit of the polar image pair, measuring the spin axis and spin rate.

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