Calculate the center of mass of the values of an array at labels.
Parameters : | input : ndarray
labels : ndarray or None, optional
index : int, sequence of int, or None, optional
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Returns : | centerofmass : tuple, or list of tuples
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Examples
>>> a = np.array(([0,0,0,0],
[0,1,1,0],
[0,1,1,0],
[0,1,1,0]))
>>> from scipy import ndimage
>>> ndimage.measurements.center_of_mass(a)
(2.0, 1.5)
Calculation of multiple objects in an image
>>> b = np.array(([0,1,1,0],
[0,1,0,0],
[0,0,0,0],
[0,0,1,1],
[0,0,1,1]))
>>> lbl = ndimage.label(b)[0]
>>> ndimage.measurements.center_of_mass(b, lbl, [1,2])
[(0.33333333333333331, 1.3333333333333333), (3.5, 2.5)]