Quantitative Evaluation of Print Quality for Optical Character Recognition Systems. - Issei Yamasaki (IEEE Trans. Syst. Man Cybern., 1978)

Segmentation of gray-scale images using piecewise linear approximation. - Issei Yamasaki; Tohru Ohshima; Makoto Hasegawa; Takao Furukawa (Syst. Comput. Jpn., 1996)

Image data compression with nonuniform block segmentation and luminance approximation using bilinear curved surface patches. - Makoto Hasegawa; Issei Yamasaki (Syst. Comput. Jpn., 2002)