Prof. Sakuichi Ohtsuka Profile

Prof. Sakuichi Ohtsuka

at Kagoshima Univ

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Proceedings Article | 13 March 2021 Paper

Abrupt and gradual change analyses of moving objects in stereoscopic viewing

Anis Rehman, Ken Kihara, Sakuichi Ohtsuka

Proceedings Volume 11766, 117661N (2021) https://doi.org/10.1117/12.2591006

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Human observers are able to allocate visual attention to multiple locations in a dynamic environment simultaneously. However, this ability depends on an individuals’ capacity to monitor the tracked objects' number, size, speed, and distance between objects. Moving objects in the real-world require that we independently allocate attentional resources to them. Recent studies have demonstrated that observers can focus attention on one location and ignore other locations; tracking performance improves when moving objects are rendered on a range of depth planes, and observers cannot track a moving object that abruptly changes depth in a 3D environment. We investigated whether an object’s abrupt or gradual changes improved attentive tracking under stereoscopic viewing in two experiments. These experiments indicated a similar pattern regardless of the depth-changing characteristics of the objects. Results demonstrated that abrupt- or gradual-changes of moving objects under stereoscopic viewing do not increase a tracking task's difficulty.

Proceedings Article | 13 March 2021 Paper

Tool to aid view of PC display for USN observers: magnifier with KUI

Shoko Hira, Shogo Hino, Sakuichi Ohtsuka

Proceedings Volume 11766, 1176608 (2021) https://doi.org/10.1117/12.2590976

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We investigate a tool to aid the viewing of PC displays by Unilateral Spatial Neglect (USN) observers by preventing overlook of the left side of the focused window. The basic concept of this tool is using observer's requests to magnify an appropriate part of the display. Based on user-interface trials, three techniques are employed: (1) whole window flashing when opening the magnifying window to realize effective attention, (2) temporal control sequence uses same special key (Ctrl, Alt, etc.) followed by normal key for easy operation by hemiplegia users, and (3) a color combination design to emphasize four sides of the focused window frame to ensure attention is paid to the left side. This tool is also effective for users with presbyopia and/or users who want to add more active window effects for presentations.

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