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  4. The Pairing of a Wavelet Basis With a Mildly Redundant Analysis via Subband Regression
 
research article

The Pairing of a Wavelet Basis With a Mildly Redundant Analysis via Subband Regression

Unser, Michael  
•
Van De Ville, Dimitri  
2008
Ieee Transactions On Image Processing

A distinction is usually made between wavelet bases and wavelet frames. The former are associated with a one-to-one representation of signals, which is somewhat constrained but most efficient computationally. The latter are over-complete, but they offer advantages in terms of flexibility (shape of the basis functions) and shift-invariance. In this paper, we propose a framework for improved wavelet analysis based on an appropriate pairing of a wavelet basis with a mildly redundant version of itself (frame). The processing is accomplished in four steps: 1) redundant wavelet analysis, 2) wavelet-domain processing, 3) projection of the results onto the wavelet basis, and 4) reconstruction of the signal from its nonredundant wavelet expansion. The wavelet analysis is pyramid-like and is obtained by simple modification of Mallat's filterbank algorithm (e.g., suppression of the down-sampling in the wavelet channels only). The key component of the method is the subband regression filter (Step 3) which computes a wavelet expansion that is maximally consistent in the least squares sense with the redundant wavelet analysis. We demonstrate that this approach significantly improves the performance of soft-threshold wavelet denoising with a moderate increase in computational cost. We also show that the analysis filters in the proposed framework can be adjusted for improved feature detection; in particular, a new quincunx Mexican-hat-like wavelet transform that is fully reversible and essentially behaves the (gamma/2)th Laplacian of a Gaussian.

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Type
research article
DOI
10.1109/TIP.2008.2004607
Web of Science ID

WOS:000260465200005

Author(s)
Unser, Michael  
Van De Ville, Dimitri  
Date Issued

2008

Publisher

Institute of Electrical and Electronics Engineers

Published in
Ieee Transactions On Image Processing
Volume

17

Start page

2040

End page

2052

Subjects

Denoising

•

feature detection

•

fractals

•

frames

•

isotropy

•

Mexican-hat filter

•

pyramid

•

wavelets

•

Reconstruction Filter Banks

•

Transform

•

Shrinkage

•

Mammograms

•

Algorithms

•

Tracking

•

Splines

•

Frames

•

CIBM-SP

URL

URL

http://bigwww.epfl.ch/publications/unser0814.ps

URL

http://bigwww.epfl.ch/publications/unser0814.html
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

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Available on Infoscience
November 30, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/60901
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