infowave.m
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上传日期:2013-01-09
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- function infowave
- %INFOWAVE Information on wavelets.
- %
- % Wavelets
- %
- %1. Crude wavelets.
- %
- % Wavelets: gaussian wavelets (gaus), morlet, mexican hat (mexihat).
- %
- % Properties: only minimal properties
- % - phi does not exist.
- % - the analysis is not orthogonal.
- % - psi is not compactly supported.
- % - the reconstruction property is not insured.
- % Possible analysis:
- % - continuous decomposition.
- % Main nice properties: symmetry, psi has explicit expression.
- % Main difficulties: fast algorithm and reconstruction
- % unavailable.
- %
- %2. Infinitely regular wavelets.
- %
- % Wavelets: meyer (meyr).
- %
- % Properties:
- % - phi exists and the analysis is orthogonal.
- % - psi and phi are indefinitely derivable.
- % - psi and phi are not compactly supported.
- % Possible analysis:
- % - continuous transform.
- % - discrete transform but with non FIR filters.
- % Main nice properties: symmetry, infinite regularity.
- % Main difficulties: fast algorithm unavailable.
- %
- % Wavelets: discrete Meyer wavelet (dmey).
- %
- % Properties:
- % - FIR approximation of the Meyer wavelet
- % Possible analysis:
- % - continuous transform.
- % - discrete transform.
- %
- %3. Orthogonal and compactly supported wavelets.
- %
- % Wavelets: Daubechies (dbN), symlets (symN), coiflets (coifN).
- %
- % General properties:
- % - phi exists and the analysis is orthogonal.
- % - psi and phi are compactly supported.
- % - psi has a given number of vanishing moments.
- % Possible analysis:
- % - continuous transform.
- % - discrete transform using FWT.
- % Main nice properties: support, vanishing moments, FIR filters.
- % Main difficulties: poor regularity.
- %
- % Specific properties:
- % For dbN : asymmetry
- % For symN : near symmetry
- % For coifN: near symmetry and phi as psi, has also
- % vanishing moments.
- %
- %4. Biorthogonal and compactly supported wavelet pairs.
- %
- % Wavelets: B-splines biorthogonal wavelets (biorNr.Nd and rbioNr.Nd).
- %
- % Properties:
- % - phi functions exist and the analysis is biorthogonal.
- % - psi and phi both for decomposition and reconstruction
- % are compactly supported.
- % - phi and psi for decomposition have vanishing moments.
- % - psi and phi for reconstruction have known regularity.
- % Possible analysis:
- % - continuous transform.
- % - discrete transform using FWT.
- % Main nice properties: symmetry with FIR filters, desirable
- % properties for decomposition and reconstruction are split
- % and nice allocation is possible.
- % Main difficulties: orthogonality is lost.
- %
- %5. Complex wavelets.
- %
- % Wavelets: Complex Gaussian wavelets (cgauN), complex Morlet
- % wavelets (cmorFb-Fc), complex Shannon wavelets (shanFb-Fc),
- % complex frequency B-spline wavelets (fbspM-Fb-Fc).
- %
- % Properties: only minimal properties
- % - phi does not exist.
- % - the analysis is not orthogonal.
- % - psi is not compactly supported.
- % - the reconstruction property is not insured.
- % Possible analysis:
- % - complex continuous decomposition.
- % Main nice properties: symmetry, psi has explicit expression.
- % Main difficulties: fast algorithm and reconstruction unavailable.
- % M. Misiti, Y. Misiti, G. Oppenheim, J.M. Poggi 12-Mar-96.
- % Last Revision: 02-Jul-1999.
- % Copyright 1995-2002 The MathWorks, Inc.
- % $Revision: 1.11 $