Andersen G J
Department of Psychology-075, University of California, Riverside 92521-0426, USA.
J Exp Psychol Hum Percept Perform. 1996 Aug;22(4):945-57. doi: 10.1037//0096-1523.22.4.945.
An assumption central to the study of 3-dimensional (3-D) shape perception is that sufficient information must be present to detect a 3-D surface. Three experiments were conducted to determine the variables important for the detection of 3-D surfaces from optic flow. Observers were presented with optic-flow displays simulating either points positioned on a corrugated 3-D surface or points randomly positioned within a 3-D volume. The task of the observer was to indicate whether the display appeared to be a 3-D surface. An increase in frequency of the corrugation for simple (single-frequency corrugation) surfaces resulted in a decrease in surface detection. Detection performance increased with an increase in density and amplitude for both simple and complex (multiple-frequency corrugation) surfaces. An analysis of the deformation of the displays suggests that 3-D surface detection may be based on the summed absolute value of the 2 shear components of deformation.
三维（3-D）形状感知研究的一个核心假设是，必须存在足够的信息来检测三维表面。进行了三项实验，以确定从光流中检测三维表面的重要变量。向观察者展示光流显示，模拟位于波纹状三维表面上的点或随机位于三维体积内的点。观察者的任务是指出该显示是否看起来是三维表面。简单（单频波纹）表面的波纹频率增加会导致表面检测率下降。对于简单和复杂（多频波纹）表面，检测性能都随着密度和振幅的增加而提高。对显示变形的分析表明，三维表面检测可能基于变形的两个剪切分量的绝对值之和。
