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You must see your structuring element as a distance. All element which belong to structurinf element are at "same distance" from center. So when structuring element is square distance is like norm-L1. when structuring element is a disk distance is like norm-L2

You must see your structuring element as a distance. All element which belong to structurinf element are at "same distance" from center. So when structuring element is square distance is like norm-L1norm-Linfini. when structuring element is a disk distance is like norm-L2