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- from __future__ import division, print_function, absolute_import
- import numpy as np
- from numpy.testing import assert_array_almost_equal
- import scipy.ndimage as ndimage
- def test_byte_order_median():
- """Regression test for #413: median_filter does not handle bytes orders."""
- a = np.arange(9, dtype='<f4').reshape(3, 3)
- ref = ndimage.filters.median_filter(a,(3, 3))
- b = np.arange(9, dtype='>f4').reshape(3, 3)
- t = ndimage.filters.median_filter(b, (3, 3))
- assert_array_almost_equal(ref, t)
- def test_zoom_output_shape():
- """Ticket #643"""
- x = np.arange(12).reshape((3,4))
- ndimage.zoom(x, 2, output=np.zeros((6,8)))
- def test_ticket_742():
- def SE(img, thresh=.7, size=4):
- mask = img > thresh
- rank = len(mask.shape)
- la, co = ndimage.label(mask,
- ndimage.generate_binary_structure(rank, rank))
- slices = ndimage.find_objects(la)
- if np.dtype(np.intp) != np.dtype('i'):
- shape = (3,1240,1240)
- a = np.random.rand(np.product(shape)).reshape(shape)
- # shouldn't crash
- SE(a)
- def test_gh_issue_3025():
- """Github issue #3025 - improper merging of labels"""
- d = np.zeros((60,320))
- d[:,:257] = 1
- d[:,260:] = 1
- d[36,257] = 1
- d[35,258] = 1
- d[35,259] = 1
- assert ndimage.label(d, np.ones((3,3)))[1] == 1
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