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from __future__ import division, print_function, absolute_import import numpy as np from numpy.testing import assert_array_almost_equal, run_module_suite 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 if __name__ == "__main__": run_module_suite()
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