[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Help-gsl] Spatial filtering of an image using wavelet transforms

From: Sebastien Maret
Subject: [Help-gsl] Spatial filtering of an image using wavelet transforms
Date: Tue, 28 Jul 2009 10:34:26 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (darwin)


I would like to write a program to filter-out the large scale spatial
variations from an image, using a wavelet transform. For this I have
padded the image with zeros so it's dimensions are 2*n * 2*n, and I have
computed the wavelet transform. I assume that in order to filter-out the
large variation scales (e.g. larger than 10 pixels), I need to set some
of these coefficients to zero and then do the backward
transform. However I am not sure about which coefficients I should to be
set to zero in order to do the filtering. Has anybody done that before?

A couple of side questions: what kind of wavelet should I choose for the
transform? Is it okay to pad the image with zeros, or is it better to
make the image periodic?

Thanks in advance for your help,

reply via email to

[Prev in Thread] Current Thread [Next in Thread]