[Numpy-discussion] 2D Hamming window
Gary Ruben
gruben at bigpond.net.au
Sat Jul 26 20:48:33 EDT 2008
Henrik Ronellenfitsch wrote:
> Hello!
> I'm looking for a 2D hamming window function.
> As far as I can see, numpy only supports 1D windows
> and googling didn't show a simple way of extending it
> in two dimensions.
>
> Thanks for your help,
>
> Henrik
Hi Henrik,
I haven't looked at the "correct" way to do this, but I recently wanted
to do the same thing and ended up with the following solution. This may
well be mathematically incorrect, but in my application it wasn't important:
import numpy as np
import scipy.signal as ss
# read heightmap here - in my case it's a square numpy float array
# build 2d window
hm_len = heightmap.shape[0]
bw2d = np.outer(ss.hamming(hm_len), np.ones(hm_len))
bw2d = np.sqrt(bw2d * bw2d.T) # I don't know whether the sqrt is correct
# window the heightmap
heightmap *= bw2d
--
Gary R.
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