SMV displays solve vergence–accommodation conflict

A conflict between accommodation and vergence is one possible cause of visual fatigue and discomfort while viewing conventional three-dimensional (3D) displays. Previous studies have proposed the super multi-view (SMV) display technique to solve the vergence-accommodation conflict, in which two or more parallax images enter the pupil of the eye with highly directional rays. We simultaneously measured accommodative, vergence and pupillary responses to SMV 3D displays to examine whether they can reduce the conflict. For comparison, responses to two-view stereo images and real objects were also measured. The results show that the range of the accommodative response was increased by the SMV images compared with the two-view images. The slope of the accommodation-vergence response function for the SMV images was similar to that for the real objects rather than the two-view images. We also found that enhancement of the accommodative range by the SMV images is noticeable with binocular viewing, indicating that vergence-induced accommodation plays an important role in viewing SMV displays. These results suggest that SMV displays induced a more natural accommodative response than did conventional, two-view stereo displays. As a result, SMV displays reduced the vergence-accommodation conflict

IMPORTANCE OF VISUAL INFORMATION AT CHANGE IN MOTION DIRECTION ON DEPTH PERCEPTION

This paper demonstrates the importance of visual information on depth perception from monocular motion parallax presented at the time of change in the motion direction of head and stimulus movements. In head-tracking systems, a longer delay time between the head and stimulus movements degrades the depth perception from monocular motion parallax. Because this delay is noticeable at this time, we hypothesized that the visual information given at the time of the direction change plays a critical role in the depth perception from motion parallax. We evaluated depth perception from monocular motion parallax with and without a visual stimulus at the time of the motion direction change to confirm our hypothesis, and clarified that stable and unambiguous depth can be perceived by presenting the change of the stimulus motion direction. We also demonstrated that it is the change in motion direction itself that is important rather than the temporal stop between deceleration and acceleration of the stimulus motion

Recent trends in depth perception research

近年の奥行き知覚研究について，その動向を概説する。特に，立体視の個人差の大規模な調査，応答バイアスを排除し立体視閾を精度良く測定する新しい立体視能力検査法の開発，運動視差からの奥行き知覚の近年の動向，運動視差や刺激の動きによる両眼立体視の促進効果，新しい3Dディスプレイ技術とそれにまつわる視覚機能の測定に関するトピックに注目し，新たな技術や研究手法の開発により得られた知見を主に紹介する。In this review, the trends in recent depth perception research are outlined. In particular, I focused on the topics related to a large-scale survey on individual differences in stereoscopic vision, the development of a new stereoscopic ability test method that eliminates response bias and accurately measures the stereoscopic threshold, recent trends in depth perception from motion parallax, the facilitation effect of binocular stereopsis by motion parallax and stimulus movement, and the measurement of visual functions on novel three-dimensional display technology. I primarily introduce the findings gained from the development of new technologies and research methods