Francesco:
This is a good paper where you will find the references to main algorithms: G Sithole, G Vosselman. Comparison of Filtering Algorithms.- Proceedings of the ISPRS working group III/3, 2003 http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.155.1855&rep=re p1&type=pdf Regards, Antonio
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