Three-dimensional shape from non-homogeneous textures: Carved stretched surfaces
Three-dimensional shape from non-homogeneous textures: Carved stretched surfaces
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DOI：
10.1167/4.10.3
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发表时间：
2004-01-01
影响因子：
1.8
通讯作者：
Zaidi, Q
中科院分区：
文献类型：
--
作者：
Li, A;Zaidi, Q
我们研究了对折叠、雕刻或拉伸纹理材料表面的3D形状的感知。纹理由正弦光栅或圆点的总和组成，并且被设计为区分表面的透视图像中存在的方向和频率信息。正确的认知凹，凸，鞍，和倾斜需要的方向调制的签名模式的可见性。这些图案与先前确定的可展表面相同（A。李清Zaidi，2000; Q. Zaidi & L. Li，2002），尽管纹理在可展曲面上统计上是均匀的，但在雕刻或拉伸曲面上不是。图像中的频率调制被解释为与观察者距离的线索，这导致了对一些雕刻和拉伸表面的微弱但定性正确的感知，但对其他表面的误解，类似于对可展表面的误解（A。Li & Q. Zaidi，2003）。无论表面上的纹理是均匀的还是非均匀的，类似的神经模块都可以用来定位签名方向调制，从而从纹理线索中提取形状。
We examined the perception of 3D shape for surfaces folded, carved, or stretched out of textured materials. The textures were composed of sums of sinusoidal gratings or of circular dots, and were designed to differentiate between orientation and frequency information present in perspective images of the surfaces. Correct perception of concavities, convexities, saddles, and slants required the visibility of signature patterns of orientation modulations. These patterns were identical to those identified previously for developable surfaces (A. Li Q. Zaidi, 2000; Q. Zaidi & L. Li, 2002), despite the fact that textures were statistically homogeneous on developable surfaces but not on carved or stretched surfaces. Frequency modulations in the image were interpreted as cues to distance from the observer, which led to weak but qualitatively correct percepts for some carved and stretched surfaces but to misperceptions for others, similar to the misperceptions for developable surfaces (A. Li & Q. Zaidi, 2003). Irrespective of whether texture on the surface is homogeneous or nonhomogeneous, similar neural modules can be used to locate signature orientation modulations and thus extract shape from texture cues.