Collision judgment when using an augmented-vision head-mounted display device.
Collision judgment when using an augmented-vision head-mounted display device.
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DOI：
10.1167/iovs.08-2916
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发表时间：
2009-09
影响因子：
4.4
通讯作者：
Peli E
中科院分区：
文献类型：
--
作者：
Luo G;Woods RL;Peli E
我们已经开发了一种设备，通过叠加宽阔场景的缩小边缘图像，为隧道视力患者提供扩大的视野，其中对象看起来比实际情况更接近方向。我们在虚拟环境中进行了实验，以确定用户是否会高估碰撞风险。根据模拟场景，参与者(12名正常视力者和7名隧道视觉者)在购物中心走廊中行走或站着，打算朝着给定的方向行走(意图步行)，他们报告了在使用和不使用该设备的情况下，他们是否会与出现在不同步行路径(或预期方向)不同偏移处的障碍物相撞。测量了碰撞包络(CE)，即基于感知碰撞判断的个人空间，以及判断不确定性(反应的变异性)。在使用该设备时，测试了两种图像比例(5倍缩小和1：1)和两种图像类型(灰度或边缘图像)的组合。图像类型对碰撞判断没有显著影响(p>；0.7)。与未戴眼罩的基线相比，缩小对正常视力受试者的模拟步行的CE没有显著影响(p=0.12)，但对于预期步行的CE增加了30%(p<；0.001)。他们的不确定性不受缩小的影响(p>；0.25)。对于患者来说，在两种行走条件下，CE和不确定性都不受缩小(p>；0.13)的影响。在模拟步行中，患者的基线CE和不确定性高于正常视力受试者(p=0.03)，但两组在所有其他条件下没有显著差异。用户并没有高估碰撞风险，因为5倍缩小的图像对碰撞判断的影响有限，无论是在行走过程中还是开始行走之前。
We have developed a device to provide an expanded visual field to patients with tunnel vision by superimposing minified edge images of the wide scene, in which objects appear closer to the heading direction than they really are. We conducted experiments in a virtual environment to determine if users would overestimate collision risks. Given simulated scenes of walking or standing with intention to walk towards a given direction (intended walking) in a shopping mall corridor, participants (12 normally sighted and 7 with tunnel vision) reported whether they would collide with obstacles appearing at different offsets from variable walking paths (or intended directions), with and without the device. The collision envelope (CE), a personal space based on perceived collision judgments, and judgment uncertainty (variability of response) were measured. When the device was used, combinations of two image scales (5× minified and 1:1) and two image types (grayscale or edge images) were tested. Image type did not significantly alter collision judgment (p>0.7). Compared to the without-device baseline, minification did not significantly change the CE of normally sighted subjects for simulated walking (p=0.12), but increased CE by 30% for intended walking (p<0.001). Their uncertainty was not affected by minification (p>0.25). For the patients, neither CE nor uncertainty was affected by minification (p>0.13) in both walking conditions. Baseline CE and uncertainty were greater for patients than normally-sighted subjects in simulated walking (p=0.03), but the two groups were not significantly different in all other conditions. Users did not substantially overestimate collision risk, as the 5× minified images had only limited impact on collision judgments either during walking or before starting to walk.