Translucency and the perception of shape
Translucency and the perception of shape
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DOI：
10.1167/17.3.17
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发表时间：
2017-03-01
影响因子：
1.8
通讯作者：
Kim, Juno
中科院分区：
文献类型：
--
作者：
Chowdhury, Nahian S.;Marlow, Phillip J.;Kim, Juno
先前的研究表明，物体的感知三维（3D）形状取决于它们的材料组成。这项工作的大部分集中在光泽，平面哑光或天鹅绒般的材料。在这里，我们研究了半透明材料的感知3D形状。我们操纵了半透明和不透明物体表面起伏扰动的空间频率。观察者指出两个表面中哪一个看起来有更多的凸起。他们还使用量规探针图判断局部表面方向。我们发现，半透明的表面似乎有较少的颠簸比不透明的表面具有相同的3D形状（实验1），特别是当自遮挡轮廓隐藏在视图中（实验2）。我们还发现，半透明物体相对于不透明物体的感知局部曲率被低估，并且感知局部表面取向的估计与不透明和半透明物体的图像的亮度类似地相关（实验3）。这些研究结果表明，完全哑光半透明物体的介观形状可以被低估，由于相对于不透明物体的亮度梯度的陡度下降。
Previous studies have shown that the perceived three-dimensional (3D) shape of objects depends on their material composition. The majority of this work has focused on glossy, flat-matte, or velvety materials. Here, we studied perceived 3D shape of translucent materials. We manipulated the spatial frequency of surface relief perturbations of translucent and opaque objects. Observers indicated which of two surfaces appeared to have more bumps. They also judged local surface orientation using gauge probe figures. We found that translucent surfaces appeared to have fewer bumps than opaque surfaces with the same 3D shape (Experiment 1), particularly when self-occluding contours were hidden from view (Experiment 2). We also found that perceived local curvature was underestimated for translucent objects relative to opaque objects, and that estimates of perceived local surface orientation were similarly correlated with luminance for images of both opaque and translucent objects (Experiment 3). These findings suggest that the perceived mesoscopic shape of completely matte translucent objects can be underestimated due to a decline in the steepness of luminance gradients relative to those of opaque objects.