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Higher-Order Riesz Transforms and Steerable Wavelet Frames

M. Unser, D. Van De Ville

Proceedings of the 2009 Sixteenth IEEE International Conference on Image Processing (ICIP'09), Cairo, Egypt, November 7-11, 2009, pp. 3801-3804.


We introduce an Nth-order extension of the Riesz transform in d dimensions. We prove that this generalized transform has the following remarkable properties: shift-invariance, scale-invariance, inner-product preservation, and steerability. The pleasing consequence is that the transform maps any primary wavelet frame (or basis) of L2(ℝd) into another "steerable" wavelet frame, while preserving the frame bounds. The concept provides a rigorous functional counterpart to Simoncelli's steerable pyramid whose construction was entirely based on digital filter design. The proposed mechanism allows for the specification of wavelets with any order of steerability in any number of dimensions; it also yields a perfect reconstruction filterbank algorithm. We illustrate the method using a Mexican-hat-like polyharmonic spline wavelet transform as our primary frame.

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AUTHOR="Unser, M. and Van De Ville, D.",
TITLE="Higher-Order {R}iesz Transforms and Steerable Wavelet Frames",
BOOKTITLE="Proceedings of the 2009 Sixteenth {IEEE} International
	Conference on Image Processing ({ICIP'09})",
YEAR="2009",
editor="",
volume="",
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pages="3801--3804",
address="Cairo, Egypt",
month="November 7-11,",
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