Saccade Mechanism Based on Processes for Depth Estimation and Incongruity Detection between Binocular Retinal Images – Analysis of Gazing Positions and Inter-saccade Intervals –
Hiroaki Kudo*, Kenya Uomori**, Mitsuho Yamada***, Noboru Ohnishi*,**** and Noboru Sugie*****
*Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-01, Japan
**Central Research Laboratories, Matsushita Electric Industrial Co., Ltd., 3-4, Hikaridai, Seika-cho, Soraku-gun, Kyoto, 619-02, Japan
***Human Vision Research Division, NHK Science and Technical Research Laboratories, 1-10-11, Kinuta, Setagaya-ku, Tokyo, 157, Japan
****Bio-Mimetic Control Research Center, RIKEN, 2271-130, Anagahora, Shimoshidani, Moriyama-ku, Nagoya, Aichi 463, Japan
*****Faculty of Science and Technology, Meijo University, 1-501, Siogamaguchi, Tempaku-ku, Nagoya, 468, Japan
We analyzed binocular gazing positions in the existence of a rim occlusion. When a human gazes at the rim of a textured cylinder, the gazing position shifts from the fixation target, When a human gazes at the rim of a cylinder whose upper-surface is visible, the gazing points are located at the estimated surface’s depth. In this paper, to investigate the mechanism changing the gazing point, we analyzed inter-saccade intervals. The result shows that an occlusion detection mechanism exists at an early stage of human visual processing, and the mechanism causes a shorter-interval saccade when incongruity regions between left and right retinal images are detected. We propose a saccade mechanism which includes processes for depth estimation and incongruity detection between binocular retinal images based on relationships between the gazing positions and the results of inter-saccade intervals.