Get skeleton from distance transform

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Hello,

I know it is possible to get the skeleton of a shape in an image from either successive morphological operations or distanceTransform. I can do this via morphological operations. But How do I do this via distanceTransform?

Right now I have:

cv::Mat input = (...);
cv::Mat output;

cv::distanceTransform(input, output, ...);

Now, how do I get the skeleton from the image transform in output?