Effects of Texture, Illumination, and Surface Reflectance on Stereoscopic Shape Perception
Effects of Texture, Illumination, and Surface Reflectance on Stereoscopic Shape Perception
复制标题
纹理、照明和表面反射率对立体形状感知的影响
作者：
J. Todd;Norman Jf;J. Koenderink;A. Kappers
观察者观看了随机结构的光滑表面的计算机生成的立体图，并被要求通过调整单目测量仪图形来判断在许多探测点上感知的局部方位。表面用镜面反射函数或朗伯反射函数来描绘，有或没有可识别的纹理元素，并且具有不同的照明方向。结果表明，尽管不同条件下深度尺度的大小存在系统差异，但所判断的浮雕图案与实际描绘的物体之间存在很强的线性相关。总体而言，观察者对光滑阴影有光泽表面的判断的准确性和可靠性略低于纹理表面，略高于平滑阴影的Lambertian表面。照明方向对观察者的判断没有可察觉的影响。
Observers viewed computer-generated stereograms of randomly structured smooth surfaces and were required to judge the perceived local orientation at numerous probe points by adjusting a monocular gauge figure. The surfaces were depicted with specular or Lambertian reflectance functions, either with or without identifiable texture elements, and with varying directions of illumination. The results revealed a strong linear correlation between the judged patterns of relief and the actual depicted objects, though there were systematic differences in the magnitude of depth scaling in the different conditions. In general, the accuracy and reliability of observers' judgments for the smoothly shaded shiny surfaces was slightly lower than for the textured surfaces and slightly higher than for the smoothly shaded Lambertian surfaces. The direction of illumination had no detectable effect on the observers' judgments.