def test_properties(self, fpath, data):
"""Test dataset and pixel array properties are as expected."""
if data[0] not in JPEG2K_SUPPORTED_SYNTAXES:
return
ds = dcmread(fpath)
assert ds.file_meta.TransferSyntaxUID == data[0]
assert ds.BitsAllocated == data[1]
assert ds.SamplesPerPixel == data[2]
assert ds.PixelRepresentation == data[3]
assert getattr(ds, 'NumberOfFrames', 1) == data[4]
bs = defragment_data(ds.PixelData)
if _get_j2k_precision(bs) != ds.BitsStored:
with pytest.warns(UserWarning, match=r"doesn't match the sample"):
arr = ds.pixel_array
else:
arr = ds.pixel_array
assert arr.flags.writeable
assert data[5] == arr.shape
assert arr.dtype == data[6]
def test_short_bytestream(self):
"""Test result when no SIZ box present"""
assert _get_j2k_precision(b'') is None
assert _get_j2k_precision(b'\xff\x4f\xff\x51' + b'\x00' * 20) is None
def test_no_siz(self):
"""Test result when no SIZ box present"""
base = b'\xff\x4f\xff\x52' + b'\x00' * 38
assert _get_j2k_precision(base + b'\x8F') is None
def test_not_j2k(self):
"""Test result when no JPEG2K SOF marker present"""
base = b'\xff\x4e\xff\x51' + b'\x00' * 38
assert _get_j2k_precision(base + b'\x8F') is None
def test_precision(self):
"""Test getting the precision for a JPEG2K bytestream."""
base = b'\xff\x4f\xff\x51' + b'\x00' * 38
# Signed
assert 16 == _get_j2k_precision(base + b'\x8F')
assert 15 == _get_j2k_precision(base + b'\x8E')
assert 14 == _get_j2k_precision(base + b'\x8D')
assert 13 == _get_j2k_precision(base + b'\x8C')
assert 12 == _get_j2k_precision(base + b'\x8B')
assert 11 == _get_j2k_precision(base + b'\x8A')
assert 10 == _get_j2k_precision(base + b'\x89')
assert 9 == _get_j2k_precision(base + b'\x88')
assert 8 == _get_j2k_precision(base + b'\x87')
# Unsigned
assert 16 == _get_j2k_precision(base + b'\x0F')
assert 15 == _get_j2k_precision(base + b'\x0E')
assert 14 == _get_j2k_precision(base + b'\x0D')
assert 13 == _get_j2k_precision(base + b'\x0C')
assert 12 == _get_j2k_precision(base + b'\x0B')
assert 11 == _get_j2k_precision(base + b'\x0A')
assert 10 == _get_j2k_precision(base + b'\x09')
assert 9 == _get_j2k_precision(base + b'\x08')
assert 8 == _get_j2k_precision(base + b'\x07')
