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fix import inside documentation and update TODO
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@@ -38,11 +38,11 @@ Edge-based segmentation
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Let us first try to detect edges that enclose the coins. For edge
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detection, we use the `Canny detector
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<http://en.wikipedia.org/wiki/Canny_edge_detector>`_ of ``skimage.filter.canny``
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<http://en.wikipedia.org/wiki/Canny_edge_detector>`_ of ``skimage.feature.canny``
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::
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>>> from skimage.filter import canny
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>>> from skimage.feature import canny
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>>> edges = canny(coins/255.)
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As the background is very smooth, almost all edges are found at the
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