def test_encoding_multiple_frames_raises(self):
"""Test encoding multiple framed pixel data raises exception."""
# Note: only works with multi-sample data
ds = dcmread(EXPL_8_3_2F)
assert ds.NumberOfFrames > 1
kwargs = RLELosslessEncoder.kwargs_from_ds(ds)
msg = (
r"Unable to encode multiple frames at once, please encode one "
r"frame at a time"
)
with pytest.raises(ValueError, match=msg):
rle_encode_frame(ds.pixel_array)
def test_cycle_32bit_1sample(self):
"""Test an encode/decode cycle for 32-bit 1 sample/pixel."""
ds = dcmread(EXPL_32_1_1F)
ref = ds.pixel_array
assert 32 == ds.BitsAllocated
assert 1 == ds.SamplesPerPixel
kwargs = RLELosslessEncoder.kwargs_from_ds(ds)
encoded = _encode_frame(ds.PixelData, **kwargs)
decoded = _rle_decode_frame(
encoded, ds.Rows, ds.Columns, ds.SamplesPerPixel, ds.BitsAllocated
)
arr = np.frombuffer(decoded, '<u4')
arr = reshape_pixel_array(ds, arr)
assert np.array_equal(ref, arr)
def test_cycle_32bit_3sample(self):
"""Test an encode/decode cycle for 32-bit 3 sample/pixel."""
ds = dcmread(EXPL_32_3_1F)
ref = ds.pixel_array
assert ds.BitsAllocated == 32
assert ds.SamplesPerPixel == 3
assert ds.PixelRepresentation == 0
kwargs = RLELosslessEncoder.kwargs_from_ds(ds)
encoded = _encode_frame(ds.PixelData, **kwargs)
decoded = _rle_decode_frame(
encoded, ds.Rows, ds.Columns, ds.SamplesPerPixel, ds.BitsAllocated
)
# The decoded data is planar configuration 1
ds.PlanarConfiguration = 1
arr = np.frombuffer(decoded, '<u4')
arr = reshape_pixel_array(ds, arr)
assert np.array_equal(ref, arr)