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METHOD AND DEVICE FOR DETERMINING THE POSITION, RADIUS AND/OR SHAPE DEVIATION OF A RING STRUCTURE

  • US 20110262042A1
  • Filed: 11/09/2009
  • Published: 10/27/2011
  • Est. Priority Date: 11/12/2008
  • Status: Active Grant
First Claim
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1. A method for processing an intensity image having a ring structure comprising:

  • defining N sectors of the intensity image, the N sectors having respective sector tips lying at a common sector origin within the ring structure, with N being a natural number where N>

    1;

    detecting a respective distance of an intensity extreme from the respective sector tip of each sector of at least one group of the sectors, in order to obtain a distance vector based on the respective distances for the sectors of the at least one group of sectors;

    performing a Fourier transformation of the distance vector; and

    determining at least one of a center of the ring structure, a radius of the ring structure and a deviation of the ring structure from a circular shape, based on a first Fourier vector obtained by the Fourier transformation.

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