Contextual effects on perceived three-dimensional shape.
Contextual effects on perceived three-dimensional shape.
复制标题
对感知三维形状的情境影响。
DOI：
10.1016/j.visres.2010.03.024
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发表时间：
2010
期刊：
影响因子：
1.8
通讯作者：
O'Kane LM
中科院分区：
文献类型：
--
作者：
O'Kane LM
双眼视差是感知深度的一个强有力的线索。然而，观察者从视差判断深度的准确性可能非常差。这是由于难以将距离因素考虑在内而按比例缩小差距（约翰斯顿，1991年）。我们测试了可用于改善这种缩放的潜在策略。使用Bradshaw，Parton和Eagle（1998）介绍的深度与宽度比任务，观察者调整深度间隔以匹配两点之间的垂直距离。第一个实验考察了在观察者和目标之间放置额外的视觉刺激的效果。尽管这些刺激有可能提供可靠的距离信息，但深度设置的准确性没有改变。第二个实验表明，存在于自然图像中的双目相关程度提供了有用的距离信息，并研究了这是否被观察者用于缩放视差。为了做到这一点，我们测量了改变目标周围呈现的相对视差的幅度是否影响深度设置。没有观察到这种影响。我们的结论是，在周围环境中的深度设置的信息的效果是有限的，在这些情况下，它提供了直接的信息，到目标的距离。
Binocular disparity is a powerful cue for the perception of depth. The accuracy with which observers can judge depth from disparity can, however, be very poor. This has been attributed to difficulties associated with the scaling of disparity to take account of distance (Johnston, 1991). We test potential strategies that could be used to improve this scaling. Using the depth-to-width ratio task introduced by Bradshaw, Parton, and Eagle (1998), observers adjusted a depth interval to match the vertical distance between two points. The first experiment examined the effect of placing additional visual stimuli between the observer and the target. Despite the potential of these stimuli to provide reliable distance information, the accuracy of depth settings did not change. The second experiment demonstrated that the degree of binocular correlation present in natural images provides useful distance information, and investigated whether this is used by observers in scaling disparity. To do this, we measured whether varying the magnitude of relative disparity presented in the surround of the target affected depth settings. No such effect was observed. We conclude that the effect of information presented in the surrounding context on settings of depth is limited to those situations in which it provides direct information about the distance to the target.