Monocular Depth Perception by Evaluation of the Blur in Defocused Images. - Gunther Schneider; Bernard Heit; Johannes Hönig; Jacques Brémont (ICIP (2), 1994)

Visual depth perception based on optical blur. - Johannes Hönig; Bernard Heit; Jacques Brémont (ICIP (1), 1996)

Depth and shape estimation of three-dimensional objects based on fuzzy system theory. - Johannes Hönig (1997)