mirror of
https://github.com/wassname/scikit-image.git
synced 2026-06-29 04:27:42 +08:00
Steven Silvester
88 lines
2.2 KiB
Python
88 lines
2.2 KiB
Python
import os
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import os.path
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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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from skimage import data_dir
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from skimage.io import imread, imsave, use_plugin, reset_plugins
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import skimage.io as sio
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try:
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import imread as _imread
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except ImportError:
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imread_available = False
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else:
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imread_available = True
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def setup():
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if imread_available:
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np.random.seed(0)
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use_plugin('imread')
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def teardown():
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reset_plugins()
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@skipif(not imread_available)
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def test_imread_flatten():
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# a color image is flattened
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img = imread(os.path.join(data_dir, 'color.png'), flatten=True)
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assert img.ndim == 2
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assert img.dtype == np.float64
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img = imread(os.path.join(data_dir, 'camera.png'), flatten=True)
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# check that flattening does not occur for an image that is grey already.
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assert np.sctype2char(img.dtype) in np.typecodes['AllInteger']
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@skipif(not imread_available)
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def test_imread_palette():
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img = imread(os.path.join(data_dir, 'palette_color.png'))
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assert img.ndim == 3
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@skipif(not imread_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(data_dir, 'truncated.jpg'))
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@skipif(not imread_available)
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def test_bilevel():
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expected = np.zeros((10, 10), bool)
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expected[::2] = 1
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img = imread(os.path.join(data_dir, 'checker_bilevel.png'))
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assert_array_equal(img.astype(bool), expected)
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class TestSave:
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def roundtrip(self, x, scaling=1):
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f = NamedTemporaryFile(suffix='.png')
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fname = f.name
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f.close()
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imsave(fname, x)
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y = imread(fname)
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assert_array_almost_equal((x * scaling).astype(np.int32), y)
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@skipif(not imread_available)
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def test_imsave_roundtrip(self):
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dtype = np.uint8
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for shape in [(10, 10), (10, 10, 3), (10, 10, 4)]:
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x = np.ones(shape, dtype=dtype) * np.random.rand(*shape)
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if np.issubdtype(dtype, float):
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yield self.roundtrip, x, 255
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else:
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x = (x * 255).astype(dtype)
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yield self.roundtrip, x
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if __name__ == "__main__":
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run_module_suite()
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