METHOD AND DEVICE FOR DETERMINING THE POSITION, RADIUS AND/OR SHAPE DEVIATION OF A RING STRUCTURE
First Claim
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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Abstract
A system and method processes intensity images having a ring structure to measure position, shape deviation and/or radius of the ring structure, and to evaluate interferograms and/or localize objects. The system and method can define N sectors of the intensity image respectively having sector tips lying at a common sector origin within the ring structure, with N being a natural number where N>1, detect a distance of an intensity extreme from the respective sector tip of each sector of at least one group of the sectors to obtain a distance vector that includes the distances from all the sectors from at least the group of the sectors, perform a Fourier transformation of the distance vector, and determine a center, a radius and/or a deviation of the ring structure from a circular shape, by using the first Fourier vector obtained by the Fourier transformation.
6 Citations
38 Claims
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1. A method for processing an intensity image having a ring structure comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for processing an intensity image having a ring structure comprising:
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a sector forming component configured to define 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;a distance acquiring component configured to acquire 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; a first Fourier transformation component configured to perform a Fourier transformation of the distance vector to obtain a first Fourier vector; and at least one of the following; a center acquiring component configured to determine a center of the ring structure from the first Fourier vector obtained by the Fourier transformation, a radius acquiring component configured to determine a radius of the ring structure from the first Fourier vector obtained by the Fourier transformation, and a shape deviation acquiring component configured to acquire a deviation of the ring structure from a circular shape based on the first Fourier vector acquired by the Fourier transformation. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification