Haar Lifting scheme

Question

I am trying to apply lifting scheme version haar to an image. I started to apply it using the code posted on the internet:

   image = imread('cameraman.tif');
   % Applying Lifting scheme
   lshaar = liftwave('haar');
   els = {'p',[-0.125 0.125],0};
   lsnew = addlift(lshaar,els);
   [cA,cD] = lwt(image,lsnew);

In fact the code above apply a lifting Haar wavelet of LEVEL1. How can I modify this code in order to apply 2 or 3 levels of lifting Haar wavelet?

Any help will be very appreciated!

Christina

score 1 · Accepted Answer · answered Oct 26 '15 at 10:13

1

A little late, but here is your answer (or read http://de.mathworks.com/help/wavelet/ref/lwt.html)

lshaar = liftwave('haar');
level = 2;
[cA,cD] = lwt(x,lshaar,level);

answered Oct 26 '15 at 10:13

Hubi

1,629
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Thank you so much for your answer; Very appreciated – Christina Nov 02 '15 at 07:41

score 1 · Answer 2 · answered Mar 19 '16 at 20:47

1

You try to apply 1-D lwt to an image which is 2-D, and that give you a wrong answer.
You should use lwt2 instead.

answered Mar 19 '16 at 20:47

Serwan Bamerni

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1
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Thank you for the answer – Christina Mar 20 '16 at 17:22

Haar Lifting scheme

2 Answers2