matlab - Could someone explain me the Contourlet Decomposition level? -


i don't understand contourlet decomposition level. please explain me following codes in matlab. nlevels=[0,2,3,4] nlevels=[2]

you have not provided enough details of code, here general idea levels of decomposition:

the main difference between wavelets, contourlets, surfacelets, x-lets how divide frequency space @ each level.

wavelet multi-resolution transform , @ each level divides 2-d frequency space 4 equal part

so see, @ each level have 4 equal squares.

contourlets differ wavelets way divide frequency space, here 2 level decomposition:

so @ each level take low frequency part , continue decomposing it, while high frequency part directional decomposition.

surfacelets, on other hand, go beyond 2-d , divide 3-d frequency space, can add more details if interested.


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