Suguru Saito, Masayuki Nakajima, Tetsuo Shima. Optimal Differential Filter on Hexagonal Lattice. In Marek R. Ogiela, Lakhmi C. Jain, editors, Computational Intelligence Paradigms in Advanced Pattern Classification. Volume 386 of Studies in Computational Intelligence, pages 59-87, Springer, 2012. [doi]
Abstract is missing.