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Raise ValueError if quantile thresholds outside of [0, 1] - and updated docs

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Robin Wilson
2015-08-29 13:46:56 +01:00
parent b29ad8ef6d
commit 5f0665c99b
1 changed files with 7 additions and 1 deletions
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skimage/feature/_canny.py
+7 -1
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@@ -70,7 +70,8 @@ def canny(image, sigma=1., low_threshold=None, high_threshold=None, mask=None,
Mask to limit the application of Canny to a certain area.
quantile_threshold : bool, optional
If True then treat low_threshold and high_threshold as quantiles of the
edge magnitude image, rather than absolute edge magnitude values.
edge magnitude image, rather than absolute edge magnitude values. If True
then the thresholds must be in the range [0, 1].
Returns
-------
@@ -255,6 +256,11 @@ def canny(image, sigma=1., low_threshold=None, high_threshold=None, mask=None,
#---- If quantile_threshold is set then calculate the thresholds to use
#
if quantile_threshold:
if high_threshold > 1.0 or low_threshold > 1.0:
raise ValueError("Quantile thresholds must not be > 1.0")
if high_threshold < 0.0 or low_threshold < 0.0:
raise ValueError("Quantile thresholds must not be < 0.0")
high_threshold = np.percentile(magnitude, 100.0 * high_threshold)
low_threshold = np.percentile(magnitude, 100.0 * low_threshold)