@article {restle_04_nonparametric, title = {Nonparametric Smoothing of Height maps using {\textquoteleft}{\textquoteleft}Confidence{\textquoteright}{\textquoteright} values}, journal = {Optical Engineering}, volume = {43}, number = {0049}, year = {2004}, pages = {866-871}, doi = {10.1117/1.1666622}, author = {J. Restle and Hissmann, M. and Fred A. Hamprecht} }