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
2013-6-17
编辑：Lokesh Ravindranathan
2013-6-17
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.
回答（1 个）
Wayne King
2013-6-17
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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2013-6-17
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