Masayuki Shimizu Makoto Nakashizuka Youji Iiguni Image Enlargement by Nonlinear Frequency Extrapolation with Morphological Operators. 859-867 2008 91-A IEICE Transactions 3 http://dx.doi.org/10.1093/ietfec/e91-a.3.859 db/journals/ieicet/ieicet91a.html#ShimizuNI08