I need a code for Haar wavelet transform.

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Atube Frank
Atube Frank 2014-2-7
回答： Wayne King 2014-2-7
Am currently working on image processing, am using Haar Wavelet transform for the feature extraction, i need a good working code on for it.
Thank you.

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Wayne King
Wayne King 2014-2-7
You can use wavedec2() with either wavelet name 'haar', or 'db1'
load woman;
J = 4; % level of the MRA
[C,S] = wavedec2(X,J,'haar');
See the help for appcoef2() and detcoef2() for how to pull out the approximation and detail coefficients.

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Walter Roberson
Walter Roberson 2014-2-7
http://www.mathworks.com/help/wavelet/ref/dbaux.html with N = 2. Haar is also called db2

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