mirror of
https://github.com/wassname/scikit-image.git
synced 2026-06-29 04:44:43 +08:00
Steven Silvester
79 lines
2.0 KiB
Python
79 lines
2.0 KiB
Python
import os
|
|
import os.path
|
|
import numpy as np
|
|
from numpy.testing import *
|
|
from numpy.testing.decorators import skipif
|
|
|
|
from tempfile import NamedTemporaryFile
|
|
|
|
from skimage import data_dir
|
|
from skimage.io import imread, imsave, use_plugin, reset_plugins
|
|
|
|
try:
|
|
import imageio as _imageio
|
|
except ImportError:
|
|
imageio_available = False
|
|
else:
|
|
imageio_available = True
|
|
|
|
|
|
def setup():
|
|
if imageio_available:
|
|
np.random.seed(0)
|
|
use_plugin('imageio')
|
|
|
|
|
|
def teardown():
|
|
reset_plugins()
|
|
|
|
|
|
@skipif(not imageio_available)
|
|
def test_imageio_flatten():
|
|
# a color image is flattened
|
|
img = imread(os.path.join(data_dir, 'color.png'), flatten=True)
|
|
assert img.ndim == 2
|
|
assert img.dtype == np.float64
|
|
img = imread(os.path.join(data_dir, 'camera.png'), flatten=True)
|
|
# check that flattening does not occur for an image that is grey already.
|
|
assert np.sctype2char(img.dtype) in np.typecodes['AllInteger']
|
|
|
|
|
|
@skipif(not imageio_available)
|
|
def test_imageio_palette():
|
|
img = imread(os.path.join(data_dir, 'palette_color.png'))
|
|
assert img.ndim == 3
|
|
|
|
|
|
@skipif(not imageio_available)
|
|
def test_imageio_truncated_jpg():
|
|
assert_raises((RuntimeError, ValueError),
|
|
imread,
|
|
os.path.join(data_dir, 'truncated.jpg'))
|
|
|
|
|
|
class TestSave:
|
|
|
|
def roundtrip(self, x, scaling=1):
|
|
f = NamedTemporaryFile(suffix='.png')
|
|
fname = f.name
|
|
f.close()
|
|
imsave(fname, x)
|
|
y = imread(fname)
|
|
|
|
assert_array_almost_equal((x * scaling).astype(np.int32), y)
|
|
|
|
@skipif(not imageio_available)
|
|
def test_imsave_roundtrip(self):
|
|
dtype = np.uint8
|
|
for shape in [(10, 10), (10, 10, 3), (10, 10, 4)]:
|
|
x = np.ones(shape, dtype=dtype) * np.random.rand(*shape)
|
|
|
|
if np.issubdtype(dtype, float):
|
|
yield self.roundtrip, x, 255
|
|
else:
|
|
x = (x * 255).astype(dtype)
|
|
yield self.roundtrip, x
|
|
|
|
if __name__ == "__main__":
|
|
run_module_suite()
|