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Use SciPy for second order interpolation, add warnings to buggy functions

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Johannes Schönberger
2014-12-13 14:45:43 +01:00
parent 8753979fd2
commit dcc021c903
2 changed files with 27 additions and 12 deletions
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skimage/transform/_geometric.py
+12 -1
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@@ -1134,7 +1134,18 @@ def warp(image, inverse_map=None, map_args={}, output_shape=None, order=1,
out = None
if order in range(4) and not map_args:
if order == 2:
# When fixing this issue, make sure to fix the branches further
# below in this function
warnings.warn("Bi-quadratic interpolation behavior has changed due "
"to a bug in the implementation of scikit-image. "
"The new version now serves as a wrapper "
"around SciPy's interpolation functions, which itself "
"is not verified to be a correct implementation. Until "
"skimage's implementation is fixed, we recommend "
"to use bi-linear or bi-cubic interpolation instead.")
if order in (0, 1, 3) and not map_args:
# use fast Cython version for specific interpolation orders and input
matrix = None