mirror of
https://github.com/wassname/scikit-image.git
synced 2026-06-29 01:11:56 +08:00
Stefan van der Walt
117 lines
3.4 KiB
Python
117 lines
3.4 KiB
Python
import os
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import skimage as si
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import skimage.io as sio
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import numpy as np
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from numpy.testing import *
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from numpy.testing.decorators import skipif
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from tempfile import NamedTemporaryFile
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try:
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import skimage.io._plugins.freeimage_plugin as fi
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FI_available = True
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sio.use_plugin('freeimage')
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except RuntimeError:
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FI_available = False
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np.random.seed(0)
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def setup_module(self):
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"""The effect of the `plugin.use` call may be overridden by later imports.
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Call `use_plugin` directly before the tests to ensure that freeimage is
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used.
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"""
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try:
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sio.use_plugin('freeimage')
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except RuntimeError:
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pass
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def teardown():
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sio.reset_plugins()
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@skipif(not FI_available)
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def test_imread():
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img = sio.imread(os.path.join(si.data_dir, 'color.png'))
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assert img.shape == (370, 371, 3)
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assert all(img[274, 135] == [0, 130, 253])
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@skipif(not FI_available)
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def test_imread_truncated_jpg():
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assert_raises((RuntimeError, ValueError),
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sio.imread,
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os.path.join(si.data_dir, 'truncated.jpg'))
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@skipif(not FI_available)
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def test_imread_uint16():
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expected = np.load(os.path.join(si.data_dir, 'chessboard_GRAY_U8.npy'))
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img = sio.imread(os.path.join(si.data_dir, 'chessboard_GRAY_U16.tif'))
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assert img.dtype == np.uint16
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assert_array_almost_equal(img, expected)
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@skipif(not FI_available)
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def test_imread_uint16_big_endian():
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expected = np.load(os.path.join(si.data_dir, 'chessboard_GRAY_U8.npy'))
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img = sio.imread(os.path.join(si.data_dir, 'chessboard_GRAY_U16B.tif'))
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assert img.dtype == np.uint16
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assert_array_almost_equal(img, expected)
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@skipif(not FI_available)
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def test_write_multipage():
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shape = (64, 64, 64)
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x = np.ones(shape, dtype=np.uint8) * np.random.rand(*shape) * 255
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x = x.astype(np.uint8)
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f = NamedTemporaryFile(suffix='.tif')
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fname = f.name
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f.close()
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fi.write_multipage(x, fname)
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y = fi.read_multipage(fname)
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assert_array_equal(x, y)
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class TestSave:
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def roundtrip(self, dtype, x, suffix):
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f = NamedTemporaryFile(suffix='.' + suffix)
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fname = f.name
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f.close()
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sio.imsave(fname, x)
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y = sio.imread(fname)
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assert_array_equal(y, x)
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@skipif(not FI_available)
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def test_imsave_roundtrip(self):
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for shape, dtype, format in [
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[(10, 10), (np.uint8, np.uint16), ('tif', 'png')],
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[(10, 10), (np.float32,), ('tif',)],
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[(10, 10, 3), (np.uint8, np.uint16), ('png',)],
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[(10, 10, 4), (np.uint8, np.uint16), ('png',)]
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]:
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tests = [(d, f) for d in dtype for f in format]
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for d, f in tests:
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x = np.ones(shape, dtype=d) * np.random.rand(*shape)
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if not np.issubdtype(d, float):
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x = (x * 255).astype(d)
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yield self.roundtrip, d, x, f
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@skipif(not FI_available)
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def test_metadata():
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meta = fi.read_metadata(os.path.join(si.data_dir, 'multipage.tif'))
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assert meta[('EXIF_MAIN', 'Orientation')] == 1
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assert meta[('EXIF_MAIN', 'Software')].startswith('I')
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meta = fi.read_multipage_metadata(os.path.join(si.data_dir,
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'multipage.tif'))
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assert len(meta) == 2
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assert meta[0][('EXIF_MAIN', 'Orientation')] == 1
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assert meta[1][('EXIF_MAIN', 'Software')].startswith('I')
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if __name__ == "__main__":
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run_module_suite()
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