Why does the approximations at different levels have the same size for wavelet swt2 function?
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[A,H,V,D] = swt2(X,N,'wname')
For 1 ? i ? N, the output matrix A(:,:,i) contains the coefficients of approximation of level i.
When I run the example given for this example, I found the sizes at different, i.e. different i, all the matrices of A(:,:,i) have the same size.
I think it's downsampled for approximation at different levels.
Where's my fault?
回答（1 个）
L.
2011-11-21
1 个投票
swt2 doesn't do downsampling, this is the difference between dwt and swt
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2011-1-28
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