I need a code for Haar wavelet transform.

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.

Answer 1

[Wayne King]

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.

Answer 2

[Walter Roberson]

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