Horizontal and vertical disparity, eye position, and stereoscopic slant perception
Horizontal and vertical disparity, eye position, and stereoscopic slant perception
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DOI：
10.1016/s0042-6989(98)00139-4
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发表时间：
1999-03-01
期刊：
影响因子：
1.8
通讯作者：
Crowell, D
中科院分区：
文献类型：
--
作者：
Backus, BT;Banks, MS;Crowell, D
立体定义表面的倾斜度不能仅由水平差或水平尺寸比（HSR）等派生量来确定。还有其他四个信号，结合水平视差，原则上可以明确地估计倾斜度：眼睛的收敛和版本，垂直大小比（VSR），以及VSR的水平梯度。另一个有用的信号是透视倾斜线索。感知角度的确定可以建模为基于这些信号的三种估计的加权组合：视角估计，基于HSR和VSR的立体估计，以及基于HSR和感知眼睛位置的立体估计。在一系列的实验中，我们研究了人类观察者对这两种立体估计方法的使用。透视线索被渲染得没有信息。我们发现VSR和感应眼位都可以用来解释测量到的水平视差。当两者处于冲突状态时，视觉系统通常更重视VSR。然而，当使用短刺激或由垂直线组成的刺激难以测量VSR时，视觉系统依赖于感知的眼睛位置。观察者的倾斜估计是基于HSR和VSR的倾斜估计和基于HSR和眼睛位置的倾斜估计的加权平均的模型可以很好地解释数据。权重在不同的观看条件下有所不同，因为它们所使用的信号的信息量在不同的情况下是不同的。1999爱思唯尔科学有限公司版权所有。
The slant of a stereoscopically defined surface cannot be determined solely from horizontal disparities or from derived quantities such as horizontal size ratio (HSR). There are four other signals that, in combination with horizontal disparity, could in principle allow an unambiguous estimate of slant: the vergence and version of the eyes, the vertical size ratio (VSR), and the horizontal gradient of VSR. Another useful signal is provided by perspective slant cues. The determination of perceived slant can be modeled as a weighted combination of three estimates based on those signals: a perspective estimate, a stereoscopic estimate based on HSR and VSR, and a stereoscopic estimate based on HSR and sensed eye position. In a series of experiments, we examined human observers' use of the two stereoscopic means of estimation. Perspective cues were rendered uninformative. We found that VSR and sensed eye position are both used to interpret the measured horizontal disparities. When the two are placed in conflict, the visual system usually gives more weight to VSR. However, when VSR is made difficult to measure by using short stimuli or stimuli composed of vertical lines, the visual system relies on sensed eye position. A model in which the observer's slant estimate is a weighted average of the slant estimate based on HSR and VSR and the one based on HSR and eye position accounted well for the data. The weights varied across viewing conditions because the informativeness of the signals they employ vary from one situation to another. (C) 1999 Elsevier Science Ltd. All rights reserved.