Johnston E B
University Laboratory of Physiology, Oxford, U.K.
Vision Res. 1991;31(7-8):1351-60. doi: 10.1016/0042-6989(91)90056-b.
The effectiveness of disparity information in defining 3-D shape was investigated by means of judgements of the shape of cylindrical continuous curved surfaces presented as random dot stereograms. At a close viewing distance, truly circular cylinders appeared elongated; at an intermediate distance, perception was close to veridical; and, at a far distance, cylinders appeared flattened. Indirect measures of scaling distance were calculated from these data. The results strongly suggest that the observed shape distortions are a consequence of scaling horizontal disparities with an incorrect measure of egocentric distance.
通过对呈现为随机点立体图的圆柱形连续曲面形状的判断，研究了视差信息在定义三维形状方面的有效性。在近距离观察时，真正的圆柱体看起来拉长了；在中等距离时，感知接近真实；而在远距离时，圆柱体看起来变扁了。根据这些数据计算了缩放距离的间接测量值。结果强烈表明，观察到的形状扭曲是由于使用了不正确的自我中心距离测量方法来缩放水平视差的结果。
