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Subject: Re: Using wavelet decomposition function dwt2
Date: Sun, 8 Nov 2009 11:35:04 +0000 (UTC)
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"Minh Tran" <overseer47@gmail.com> wrote in message <hd63pb$bgc$1@fred.mathworks.com>...
> I'm having trouble with using dwt2 on my intensity image, specifically the LL output. From the examples I've seen elsewhere, the LL output shouldn't be very different from the original intensity image, yet mine is quite whitewashed/overexposed. Any suggestions about this problem ?
> 
> My code : 
> i = hsi_image(:,:,3);
> [LL,LH,HL,HH] = dwt2(i,'db4');

Hi Minh, what command(s) are you using to actually view the images? It's hard for anyone to say without seeing those commands and knowing something about your image. Can you reproduce this behavior with one of the images that come with the wavelet toolbox, so we can all see?

>>load woman

for example

wayne