Zaidi Qasim, Li Andrea
SUNY College of Optometry, 33 West 42nd Street, New York, NY 10036, USA.
Vision Res. 2002 Mar;42(7):815-35. doi: 10.1016/s0042-6989(01)00233-4.
This paper uses visual, empirical and formal methods (Li & Zaidi, Vision Research, 40 (2000) 217; Li & Zaidi, Vision Research, 41 (22) (2001a) 2927) to examine the roles of oriented texture components in conveying veridical percepts of concave and convex surfaces that are pitched towards or away from the observer. The results show that pairs of components, oriented symmetrically around the axis of maximum curvature, combine to provide the geodesic orientation modulations that are critical for veridical shape perception. The degree of pitch determines the orientations of the critical pair of components. Perspective is crucial to the veridical perception of concavities and convexities, regardless of the degree of pitch. The results of this paper reconfirm that veridical shape perception depends on extracting critical patterns of oriented energy, but also show that the class of textures capable of conveying veridical percepts of developable shapes in general views is even more restricted than that identified by Li and Zaidi (Journal of Optical Society of America A, 18 (2001b), 2430).
本文运用视觉、实证和形式化方法（李&扎伊迪，《视觉研究》，40 (2000) 217；李&扎伊迪，《视觉研究》，41 (22) (2001a) 2927），研究有向纹理成分在传达朝向或远离观察者倾斜的凹面和凸面的真实感知方面的作用。结果表明，围绕最大曲率轴对称定向的成分对，共同提供了对真实形状感知至关重要的测地线方向调制。倾斜程度决定了关键成分对的方向。无论倾斜程度如何，透视对于凹面和凸面的真实感知都至关重要。本文的结果再次证实，真实形状感知取决于提取有向能量的关键模式，但也表明，在一般视图中能够传达可展形状真实感知的纹理类别，甚至比李和扎伊迪所确定的（《美国光学学会杂志A》，18 (2001b)，2430）更加受限。
