Handwritten Digit Recognition by Hierarchical Displacement Extraction with Gradual Prototype Elimination. - Yoshiki Mizukami; Taiji Sato; Kanya Tanaka (ICPR, 2000)

A comparison study for displacement computation - Horn and Shunck's method versus March's method. - Yoshiki Mizukami; Taiji Sato; Kanya Tanaka (Pattern Recognit. Lett., 2001)