It has been demonstrated previously that isotropy of wavelets is advantageous for the detection of pointwise singularities. The influence of the isotropy is studied here for a broader class of operators. We compare Gabor filters which provide a relatively high directionality, the spherical wavelet and the Mexican Hat function which is isotropic. From experiments on different backgrounds and with defects of varying size, we observe a clear influence of sphericity on the detection of small singularities. (c) 2006 Elsevier B.V. All rights reserved.
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