Euclidean Distance Skin Lesion

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ingeln91
ingeln91 2017-4-3
评论： Walter Roberson 2017-4-5
Hello everyone !!! I'm trying to evaluate the diameter of a skin lesion by evaluate the euclidean distances between all the pixels of the border and averaging it. How can i do it ?

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Walter Roberson
Walter Roberson 2017-4-3
编辑：Walter Roberson 2017-4-3
You could regionprops and ask for MajorAxesLength to get "equivalent" diameter (an ellipse would be fitted to the data.)
I suspect that might be accurate enough for your purpose. If not then bwtraceboundary(), or regionprops pixellist . Then pdist(). And do not average the distances: take the maximum distance to get the diameter.
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ingeln91
ingeln91 2017-4-5
what do you mean for "equivalent" diameter ?
Walter Roberson
Walter Roberson 2017-4-5
https://www.mathworks.com/help/images/ref/regionprops.html
'MajorAxisLength' Returns a scalar that specifies the length (in pixels) of the major axis of the ellipse that has the same normalized second central moments as the region.
Or, as I posted earlier "an ellipse would be fitted to the data"

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