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From: "Minh Tran" <overseer47@gmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: Using wavelet decomposition function dwt2
Date: Sun, 8 Nov 2009 09:42:03 +0000 (UTC)
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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');