Method for aligning and tracking point regions in images with radial distortion that outputs motion model parameters, distortion calibration, and variation in zoom
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United States of America Patent
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Jun 14, 2016
Grant Date -
Sep 10, 2015
app pub date -
Oct 7, 2013
filing date -
Oct 5, 2012
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Abstract
The present invention relates to a method for matching point regions in images with radial distortion that, given two frames acquired by a camera with radial distortion, estimates the global image distortion and the local transformations undergone by the image regions between frames, with the objective of accurately tracking an aligning these image regions in a sequence of frames, calibrating the radial distortion using only moving image points, or estimating the relative change in focal length in cameras with radial distortion and variable zoom using only moving image points, and that comprises the following steps: extracting local image features; tracking local features; and determining the radial distortion calibration based on a computational efficient procedure that uses the information for all local features being tracked.
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