A computational model for shape estimation by integration of shading and edge information. - Hideki Hayakawa; Shin'ya Nishida; Yasuhiro Wada; Mitsuo Kawato (Neural Networks, 1994)

Shape, surface reflectance, illuminant direction and illuminant intensity from images with shading. - Hideki Hayakawa (Syst. Comput. Jpn., 1994)

Estimating the Propagation Velocity Distribution and the Position of Buried Pipe Using x -t - v Data Matrix of Subsurface Radar Image. - Yasuhiro Fujimura; Akira Kawanaka; Hideki Hayakawa (MVA, 1996)