Motion parallax: effects of blur, contrast, and field size in normal and low vision
Motion parallax: effects of blur, contrast, and field size in normal and low vision
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DOI：
10.1068/p261529
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发表时间：
1997-01-01
期刊：
影响因子：
1.7
通讯作者：
Menge, MR
中科院分区：
文献类型：
--
作者：
Jobling, JT;Mansfield, JS;Menge, MR
不同形式的低视力人群可以利用运动视差来提高深度判断吗？我们使用阶梯法来比较运动视差和静态观察的深度阈值。我们测试了 18 名正常视力受试者，他们在敏锐度、对比敏感度和模拟周边视野损失方面存在一系列模拟缺陷，以及 10 名低视力受试者，他们在敏锐度、对比敏感度和视野损失方面存在广泛的模拟缺陷。受试者单眼观察三个垂直圆柱体，并指出其中一个与其他两个圆柱体的深度不同。对于运动视差试验，观察者将头部（在滚轮上的观察组件中）在 6-12 厘米的范围内从一侧移动到另一侧。对于静态试验，观察组件被固定到位。正常视力受试者的运动视差深度阈值在所有敏锐度和对比度水平上均显着小于静态观看者，平均为 1.95 (p < 0.05)。对于低视力观察者来说，深度阈值表现出较大的个体差异；然而，运动视差阈值比静态阈值平均小 2.05 倍 (p < 0.01)。这些发现表明运动视差可以为视力低下的人提供有用的深度信息。
Can people with different forms of low vision use motion parallax to improve depth judgments? We used a staircase method to compare depth thresholds using motion parallax and static viewing. We tested eighteen normal-vision subjects with a range of simulated deficits in acuity, contrast sensitivity, and simulated peripheral-field loss, and ten low-vision subjects with a wide range of acuity, contrast sensitivity, and field loss. Subjects viewed three vertical cylinders monocularly and indicated which one was at a different depth from the other two. For motion-parallax trials, observers moved their heads (in a viewing assembly on rollers) from side to side over a range of 6-12 cm. For static trials, the viewing assembly was fixed in place. Normal-vision subjects' depth thresholds with motion parallax were significantly smaller than those with static viewing by an average factor of 1.95 (p < 0.05) across all levels of acuity and contrast. For low-vision observers, the depth thresholds exhibited large individual differences; however, the motion-parallax thresholds were smaller than the static thresholds by an average factor of 2.05 (p < 0.01). These findings indicate that motion parallax can provide useful depth information for people with low vision.