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Steerable Wavelet Frames Based on the Riesz Transform

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4 Author(s)
Held, S. ; Zentrum Math., Tech. Univ. Munchen, Munich, Germany ; Storath, M. ; Massopust, P. ; Forster, B.

We consider an extension of the 1-D concept of analytical wavelet to n-D which is by construction compatible with rotations. This extension, called a monogenic wavelet, yields a decomposition of the wavelet coefficients into amplitude, phase, and phase direction. The monogenic wavelet is based on the hypercomplex monogenic signal which is defined using Riesz transforms and perfectly isotropic wavelets frames. Employing the new concept of Clifford frames, we can show that the monogenic wavelet generates a wavelet frame. Furthermore, this approach yields wavelet frames that are steerable with respect to direction. Applications to descreening and contrast enhancement illustrate the versatility of this approach to image analysis and reconstruction.

Published in:

Image Processing, IEEE Transactions on  (Volume:19 ,  Issue: 3 )

Date of Publication:

March 2010

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