Wavelets and Wavelet Transforms by C. Sidney Burrus - HTML preview

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Chapter 12Summary Overview*

It is licensed under the Creative Commons Attribution License: http://creativecommons.org/licenses/by/3.0/

2013/02/11 15:08:09 -0600

Summary

12.1Properties of the Basic Multiresolution Scaling Function

The first summary is given in four tables of the basic relationships and equations, primarily developed in Chapter: The Scaling Function and Scaling Coefficients, Wavelet and Wavelet Coefficients , for the scaling function φ(t), scaling coefficients h(n), and their Fourier transforms Φ(ω) and H(ω) for the multiplier M=2 or two-band multiresolution system. The various assumptions and conditions are omitted in order to see the “big picture" and to see the effects of increasing constraints.

Table 12.1. Properties of M=2 Scaling Functions (SF) and their Fourier Transforms
CaseCondition φ ( t ) Φ ( ω ) Signal Space
1Multiresolution _autogen-svg2png-0008.png _autogen-svg2png-0009.png distribution
2Partition of 1 φ ( tn ) = 1 Φ ( 2 π k ) = δ ( k ) distribution
3Orthogonal _autogen-svg2png-0012.png ∑ | Φ ( ω + 2 π k ) | 2 = 1 L2
5SF Smoothness _autogen-svg2png-0015.png  poly ∈Vj
6SF Moments _autogen-svg2png-0017.png  Coiflets
Table 12.2. Properties of M=2 Scaling Coefficients and their Fourier Transforms
CaseCondition h ( n ) H ( ω ) Eigenval.{T}
1Existence _autogen-svg2png-0021.png _autogen-svg2png-0022.png  
2Fundamental h ( 2 n ) = ∑ h ( 2 n + 1 ) H ( π ) = 0 EV = 1
3QMF _autogen-svg2png-0026.png | H ( ω ) | 2 + | H ( ω + π ) | 2 = 2 EV ≤ 1
4Orthogonal _autogen-svg2png-0029.png | H ( ω ) | 2 + | H ( ω + π ) | 2 = 2 one EV =1
 L2 Basis and H(ω)≠0,|ω|≤π/3others <1
6Coiflets nkh ( n ) = 0   
Table 12.3. Properties of M=2 Wavelets (W) and their Fourier Transforms
CaseCondition ψ ( t ) Ψ ( ω ) Signal Space
1MRA _autogen-svg2png-0039.png _autogen-svg2png-0040.png distribution
3Orthogonal _autogen-svg2png-0041.png   L2
3Orthogonal _autogen-svg2png-0043.png   L2
5W Moments _autogen-svg2png-0045.png  poly not∈Wj
Table 12.4. Properties of M=2 Wavelet Coefficients and their Fourier Transforms
CaseCondition h1 ( n ) H1 ( ω ) Eigenval.{T}
2Fundamental h1 ( n ) = 0 H1 ( 0 ) = 0  
3Orthogonal h1 ( n ) = ( – 1 ) nh ( 1 – n ) | H1 ( ω ) | = | H ( ω + π ) |  
3Orthogonal h1 ( n ) h1 ( 2 mn ) = δ ( m ) | H1

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