Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Analytical Footprints: Compact Representation of Elementary Singularities in Wavelet Bases
 
research article

Analytical Footprints: Compact Representation of Elementary Singularities in Wavelet Bases

Van De Ville, Dimitri
•
Forster-Heinlein, Brigitte
•
Unser, Michael
Show more
2010
Ieee Transactions On Signal Processing

We introduce a family of elementary singularities that are point-Holder alpha-regular. These singularities are self-similar and are the Green functions of fractional derivative operators; i.e., by suitable fractional differentiation, one retrieves a Dirac delta function at the exact location of the singularity. We propose to use fractional operator-like wavelets that act as a multiscale version of the derivative in order to characterize and localize singularities in the wavelet domain. We show that the characteristic signature when the wavelet interacts with an elementary singularity has an asymptotic closed-form expression, termed the analytical footprint. Practically, this means that the dictionary of wavelet footprints is embodied in a single analytical form. We show that the wavelet coefficients of the (nonredundant) decomposition can be fitted in a multiscale fashion to retrieve the parameters of the underlying singularity. We propose an algorithm based on stepwise parametric fitting and the feasibility of the approach to recover singular signal representations.

  • Details
  • Metrics
Type
research article
DOI
10.1109/TSP.2010.2068295
Web of Science ID

WOS:000284361700012

Author(s)
Van De Ville, Dimitri
Forster-Heinlein, Brigitte
Unser, Michael
Blu, Thierry
Date Issued

2010

Publisher

Institute of Electrical and Electronics Engineers

Published in
Ieee Transactions On Signal Processing
Volume

58

Start page

6105

End page

6118

Subjects

Elementary singularities

•

footprints

•

fractional derivatives

•

generalized fractional splines

•

wavelet bases

•

Transforms

•

Approximation

•

Decomposition

•

Construction

•

Algorithms

•

Operators

•

Splines

•

Signals

•

CIBM-SP

URL

URL

http://miplab.epfl.ch/pub/vandeville1002.pdf
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CIBM  
Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/74974
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés