decimation in dwt is
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i am performing following operation on 256*256 lena image after execution four bands are of size 136*136 according to me it should be of 128*128 pls clear.
[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('db9'); [LLD,LHD,HLD,HHD]=dwt2(GRAY,Lo_D,Hi_D);
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Lokesh Ravindranathan
on 17 Jun 2013
Edited: Lokesh Ravindranathan
on 17 Jun 2013
It seems like wfilters and dwt2 are not MATLAB toolbox functions. Maybe, you are using a window inside of these functions. If you provide a better insight into the code, the inconsistency can be explained.
Answers (1)
Wayne King
on 17 Jun 2013
The problem is that you should first set the dwtmode to 'per' to get the subband sizes you expect.
dwtmode('per');
load woman; % 256x256
[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('db9');
[LLD,LHD,HLD,HHD]=dwt2(X,Lo_D,Hi_D);
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