Daubechies-4 Transform in MATLAB

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Published on 2010-04-14T18:03:24Z Indexed on 2010/04/18 11:33 UTC
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matlab

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signal-processing

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signals

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wavelet

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transform

Hello:

I have a 4x4 matrix which I wish to decompose into 4 frequency bands (LL, HL, LH, HH where L=low, H=high) by using a one-level Daubechies-4 wavelet transform. As a result of the transform, each band should contain 2x2 coefficients. How can I do this in MATLAB? I know that MATLAB has dbaux and dbwavf functions. However, I'm not sure how to use them and I also don't have the wavelet toolbox.

Any help is greatly appreciated.

Thanks.

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