def test_no_pixel_data_raises(self):
"""Test get_pixeldata raises if dataset has no PixelData."""
ds = dcmread(MR_RLE_1F)
del ds.PixelData
assert 'PixelData' not in ds
with pytest.raises(AttributeError, match=' dataset: PixelData'):
get_pixeldata(ds)
def test_unknown_pixel_representation_raises(self):
"""Test get_pixeldata raises if invalid PixelRepresentation."""
ds = dcmread(MR_RLE_1F)
ds.PixelRepresentation = 2
# Should probably be ValueError instead
with pytest.raises(TypeError, match="format='bad_pixel_repr"):
get_pixeldata(ds)
def test_little_endian_segment_order(self):
"""Test interpreting segment order as little endian."""
ds = dcmread(MR_RLE_1F)
assert ds.file_meta.TransferSyntaxUID == RLELossless
assert ds.BitsAllocated == 16
assert ds.SamplesPerPixel == 1
assert 'NumberOfFrames' not in ds
assert ds.PixelRepresentation == 1 # signed
# Big endian
arr = get_pixeldata(ds, rle_segment_order='>')
arr = reshape_pixel_array(ds, arr)
assert (64, 64) == arr.shape
assert (422, 319, 361) == tuple(arr[0, 31:34])
assert (366, 363, 322) == tuple(arr[31, :3])
assert (1369, 1129, 862) == tuple(arr[-1, -3:])
# Little endian
arr = get_pixeldata(ds, rle_segment_order='<')
arr = reshape_pixel_array(ds, arr)
assert (64, 64) == arr.shape
assert (-23039, 16129, 26881) == tuple(arr[0, 31:34])
assert (28161, 27393, 16897) == tuple(arr[31, :3])
assert (22789, 26884, 24067) == tuple(arr[-1, -3:])
def test_no_pixel_data_raises(self):
"""Test get_pixeldata raises if dataset has no PixelData."""
ds = dcmread(MR_RLE_1F)
del ds.PixelData
assert 'PixelData' not in ds
# Should probably be AttributeError instead
with pytest.raises(TypeError, match='No pixel data found'):
get_pixeldata(ds)
def test_change_photometric_interpretation(self):
"""Test get_pixeldata changes PhotometricInterpretation if required."""
def to_rgb(ds):
"""Override the original function that returned False"""
return True
# Test default
ds = dcmread(MR_RLE_1F)
assert ds.PhotometricInterpretation == 'MONOCHROME2'
get_pixeldata(ds)
assert ds.PhotometricInterpretation == 'MONOCHROME2'
# Test opposite
orig_fn = RLE_HANDLER.should_change_PhotometricInterpretation_to_RGB
RLE_HANDLER.should_change_PhotometricInterpretation_to_RGB = to_rgb
get_pixeldata(ds)
assert ds.PhotometricInterpretation == 'RGB'
RLE_HANDLER.should_change_PhotometricInterpretation_to_RGB = orig_fn
def time_32bit_1sample(self):
"""Time retrieval of 32-bit, 1 sample/pixel RLE data."""
for ii in range(self.no_runs):
get_pixeldata(self.ds_32_1_1)
def time_16bit_3sample(self):
"""Time retrieval of 16-bit, 3 sample/pixel RLE data."""
for ii in range(self.no_runs):
get_pixeldata(self.ds_16_3_1)
def test_unsupported_syntaxes_raises(self):
"""Test get_pixeldata raises if unsupported Transfer Syntax."""
ds = dcmread(MR_EXPL_LITTLE_1F)
# Typo in exception message
with pytest.raises(NotImplementedError, match='RLE decompressordoes'):
get_pixeldata(ds)
def test_unsupported_syntaxes_raises(self):
"""Test get_pixeldata raises if unsupported Transfer Syntax."""
ds = dcmread(MR_EXPL_LITTLE_1F)
with pytest.raises(NotImplementedError,
match='syntax is not supported by the RLE pixel'):
get_pixeldata(ds)
def test_unknown_pixel_representation_raises(self):
"""Test get_pixeldata raises if invalid PixelRepresentation."""
ds = dcmread(MR_RLE_1F)
ds.PixelRepresentation = 2
with pytest.raises(ValueError, match=r"value of '2' for '\(0028,0103"):
get_pixeldata(ds)
def test_unsupported_syntaxes_raises(self):
"""Test get_pixeldata raises if unsupported Transfer Syntax."""
ds = dcmread(EXPL_16_1_1F)
msg = r'syntax is not supported by the RLE pixel'
with pytest.raises(NotImplementedError, match=msg):
get_pixeldata(ds)
def time_16bit_3sample(self):
"""Time retrieval of 16-bit, 3 sample/pixel RLE data."""
for ii in range(self.no_runs):
get_pixeldata(self.ds_16_3_1)
def time_08bit_1sample(self):
"""Time retrieval of 8-bit, 1 sample/pixel RLE data."""
for ii in range(self.no_runs):
get_pixeldata(self.ds_8_1_1)
