[Numpy-discussion] neighborhood iterator
Nadav Horesh
nadavh@visionsense....
Mon Nov 23 08:12:30 CST 2009
Thank you, this is a start. I seems that there are more issues to resolve. I am trying to make a general frame that would enable one to write filters using this iterator.
Nadav
-----Original Message-----
From: numpy-discussion-bounces@scipy.org on behalf of David Warde-Farley
Sent: Mon 23-Nov-09 03:21
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] neighborhood iterator
On 22-Nov-09, at 12:50 PM, Nadav Horesh wrote:
>
> I wonder if the neighbourhood iterator can be used as a more
> efficient replacement for ndimage.generic_filter. Is there a way to
> use it from cython?
Yes, using the NumPy C API, called like any other C function is from
Cython. Something like:
######################
import numpy as np
cimport numpy as np
cdef extern from "numpy/arrayobject.h":
object PyArray_NeighborhoodIterNew(object iter, np.npy_intp bounds,
int mode, object, np.ndarray
fill_value)
int PyArrayNeighborhoodIter_Next(object iter)
int PyArrayNeighborhoodIter_Reset(object iter)
######################
should do the trick.
Note that you'll need to call np.import_array() before using any of
these functions to initialize the C API, I think.
David
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