A multi-stage algorithm of extracting joint points for generating function-fonts. - Ryoji Haruki; Kazuo Toraichi; Yasuhiro Ohtaki (ICDAR, 1993)

Three-dimensional Measurement Approach for Automatic Seal Impression Identification. - Ryoji Haruki; Takahiko Horiuchi; Kazuo Toraichi; Kazuhiko Yamamoto; Hiromitsu Yamada; Anis Fu (MVA, 1994)

Observation method for mathematical graphology. - Kazuo Toraichi; Takahiko Horiuchi; Ryoji Haruki (ICDAR, 1995)

Three-Dimensional Measurement Approach for Seal Identification. - Ryoji Haruki; Marc Rioux; Yasuhiro Ohtaki; Takahiko Horiuchi; Kazuhiko Yamamoto; Hiromitsu Yamada; Kazuo Toraichi (IEICE Trans. Inf. Syst., 1995)

Three-dimensional approach to thresholding seal impressions. - Takahiko Horiuchi; Marc Rioux; Ryoji Haruki; Kazuhiko Yamamoto; Hiromitsu Yamada; Kazuo Toraichi (Pattern Recognit., 1996)

Scalable Image Coding by Spline Approximation for a Gray-scale Image. - Ryoji Haruki; Takahiko Horiuchi (ICDAR, 1997)

Two-dimensional Extension of Nonlinear Normalization Method using Line Density for Character Recognition. - Takahiko Horiuchi; Ryoji Haruki; Hiromitsu Yamada; Kazuhiko Yamamoto (ICDAR, 1997)

Improved and Extended Scalable Image Coding by Spline Approximation for a Binary, Gray-Scale and Color Image. - Ryoji Haruki; Takahiko Horiuchi (ICPADS, 2000)

Data Fitting by Spline Functions Using the Biorthonormal Basis of the B-spline Basis. - Ryoji Haruki; Takahiko Horiuchi (ICPR, 2000)