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Merge pull request #311 from stefanv/dtype_bool_fast

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ENH: Bool dtype conversion speed improvements.
This commit is contained in:
Tony S Yu
2012-09-13 18:35:27 -07:00
parent 256319e0a8 8494a18882
commit 051f73f2b6
1 changed files with 6 additions and 3 deletions
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skimage/util/dtype.py
+6 -3
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@@ -155,11 +155,14 @@ def convert(image, dtype, force_copy=False, uniform=False):
if kind_in in "fi":
sign_loss()
prec_loss()
return dtype(image)
return image > dtype_in(dtype_range[dtype_in][1] / 2)
if kind_in == 'b':
# from binary image, to float and to integer
return dtype(image) * dtype(dtype_range[dtype][1])
result = dtype(image)
if kind != 'f':
result *= dtype(dtype_range[dtype][1])
return result
if kind in 'ui':
imin = np.iinfo(dtype).min