Large-scale visual frontoparallels under full-cue conditions
Large-scale visual frontoparallels under full-cue conditions
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DOI：
10.1068/p3295
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发表时间：
2002-01-01
期刊：
影响因子：
1.7
通讯作者：
Lappin, JS
中科院分区：
文献类型：
--
作者：
Koenderink, JJ;van Doorn, AJ;Lappin, JS
我们确定了自然场景（大白天的大草坪）中的视锋纬曲率。在这些条件下的锋面平行线上的数据是非常稀疏的，揭示了特殊的曲率的锋面平行线和不规则的变化与距离。我们使用了一种方法的平分线段表示，通过对桩的角度分离（从Vantage位置）高达120度。使用了2 in和10 in的距离（向前方向）。观察员操纵一辆载有第三根木桩的无线电控制车辆进行了平分。四名观察员参加了实验;他们对任务没有问题，并得出了相互一致的结果。我们发现，额平行线是显着弯曲，是凹向观察者。令人惊讶的是，曲率的符号与通过离心指向任务定义锋纬线时发现的相反。可用的理论（Luneburg的）没有预测到这一点，但该理论几乎不适用于自然场景中的视觉情况。这种有趣的差异以前没有报道过。
We determined the curvature of apparent frontoparallels in a natural scene (a large lawn in broad daylight). Data on frontoparallels in these conditions are very sparse and reveal idiosyncratic curvatures of frontoparallels and irregular variation with distance. We used a method of bisection of linear segments indicated through pairs of stakes at angular separations (from the vantage point) of up to 120 deg. Distances of 2 in and 10 in (in the forward direction) were used. The bisection was carried out by the observer through maneuvering a radio-controlled vehicle carrying a third stake. Four observers participated in the experiment; they had no problems with the task and yielded mutually consistent results. We found that the frontoparallels are significantly curved and are concave towards the observer. Surprisingly, the sign of the curvature is opposite to that found when the frontoparallels are defined through an exocentric pointing task. Available theory (Luneburg's) does not predict this, but the theory is hardly applicable to the case of vision in natural scenes. This interesting discrepancy has not been reported before.