MATLAB Answers


Additional wavelets that can be used in 2D CWT?

Asked by Michael
on 22 Aug 2017
Latest activity Commented on by Michael
on 25 Aug 2017
I was hoping that I could use additional wavelets beyond the wavelets that are supported by cwtft2. Specifically the Meyer and Coiflet wavelets.
Is there a way to do this?


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1 Answer

Answer by Wayne King
on 25 Aug 2017
 Accepted Answer

Hi Michael, in order to use a wavelet in CWTFT2, we need to have the expression for the Fourier transform of the wavelet. The wavelets in CWTFT2 are all defined in the Fourier domain and the algorithm is implemented as a 2D convolution via a 2D DFT.
Coiflets for example are defined simply via the scaling and wavelet filters and implemented in a pyramid algorithm which is suitable for discrete analysis but not continuous analysis.
If you want a redundant wavelet transform in 2D that uses coiflets, have you considered SWT2?

  1 Comment

I'm new to the world of wavelets, I had not considered SWT2. Thanks for the answer and clarification.

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