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Wavelets with convolution-type orthogonality conditions

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2 Author(s)
Niijima, K. ; Dept. of Inf., Kyushu Univ., Fukuoka, Japan ; Kuzume, K.

Wavelets with free parameters are constructed using a convolution-type orthogonality condition. First, finer and coarser scaling function spaces are introduced with the help of a two-scale relation for scaling functions. An inner product and a norm having convolution parameters are defined in the finer scaling function space, which becomes a Hilbert space as a result. The finer scaling function space can be decomposed into the coarser one and its orthogonal complement. A wavelet function is constructed as a mother function whose shifted functions form an orthonormal basis in the complement space. Such wavelet functions contain the Daubechies' compactly supported wavelets as a special case. In some restricted cases, several symmetric and almost compactly supported wavelets are constructed analytically by tuning free convolution parameters contained in the wavelet functions

Published in:

Signal Processing, IEEE Transactions on  (Volume:47 ,  Issue: 2 )

Date of Publication:

Feb 1999

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