Backprojection of some image symmetries based on a local orientation description [Elektronisk resurs] / Björn Johansson
Johansson, Björn, 1971- (författare)
- Linköping, 2000
- Engelska 14 s.
Serie: LiTH-ISY-R, 1400-3902 ; 2311
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- Some image patterns, e.g. circles, hyperbolic curves, star patterns etc., can be described in a compact way using local orientation. The features mentioned above is part of a family of patterns called rotational symmetries. This theory can be used to detect image patterns from the local orientation in double angle representation of an images. Some of the rotational symmetries are described originally from the local orientation without being designed to detect a certain feature. The question is then: given a description in double angle representation, what kind of image features does this description correspond to? This 'inverse', or backprojection, is not unambiguous - many patterns has the same local orientation description. This report answers this question for the case of rotational symmetries and also for some other descriptions.
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