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Local Regularity Preserving Signal Denoising I: Hölder Exponents

Abstract : We propose a denoising method that has the property of preserving local regularity, in the sense of local H ̈lder exponent. This approach is fitted to the processing of irregular signals, and gives specially relevant results for those displaying a local form of scale invariance known as localisability. A wavelet decomposition is used to measure and control the local H ̈lder exponent. The main ingredient of the algorithm is an estimator (which is of independent interest) of the time-dependent cut-off scale beyond which wavelet coefficients are mainly due to noise. Based on local regularity estimated from information below the cut-off scale, these small-scale coefficients -which govern the texture- are cor- rected so that the H ̈lder exponent of the denoised signal matches the one of the original signal. The processing is only slightly more com- plex than classical wavelet coefficients thresholding, resulting in fast computing times. Numerical experiments show the good performance of this scheme on various localisable signals.
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https://hal.inria.fr/hal-00879754
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Submitted on : Monday, November 4, 2013 - 5:14:15 PM
Last modification on : Thursday, March 29, 2018 - 1:36:01 PM
Long-term archiving on: : Friday, April 7, 2017 - 8:46:14 PM

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Antoine Echelard, Jacques Lévy Véhel. Local Regularity Preserving Signal Denoising I: Hölder Exponents. 2013. ⟨hal-00879754⟩

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