Fingerprint Image Enhancement using a Parallel Ridge Filter. - Takahiro Nakamura; Miwako Hirooka; Hideto Fujiwara; Kazuhiko Sumi (ICPR (1), 2004)

A Visual Inspection System Based on Trinarized Broad-Edge and Gray-Scale Hybrid Matching. - Haruhisa Okuda; Manabu Hashimoto; Miwako Hirooka; Kazuhiko Sumi (IEICE Trans. Inf. Syst., 2006)