Medina Puerta A
Jet Propulsion Laboratory, California Institute of Technology, Pasadena 91109.
J Opt Soc Am A. 1989 Feb;6(2):309-11. doi: 10.1364/josaa.6.000309.
Our ability to localize objects in three-dimensional space relies primarily on the stereoscopic capability of our visual system. It is generally believed that parallax disparities in the retinal images in our two eyes are required for experiencing stereovision. Traditionally, parallax disparities refer to points that are well defined within the objects, such as edges or boundaries. Shadows can create abrupt luminance changes in the scene but are neither edges nor boundaries, and their position varies with the position of the light sources. It is demonstrated that retinal images with no parallax disparity but with different shadows are fused stereoscopically, imparting depth perception to the imaged scene. Shadows are shown to be an important, hitherto undescribed stereoscopic cue for depth perception.
我们在三维空间中定位物体的能力主要依赖于视觉系统的立体视觉能力。人们普遍认为，双眼视网膜图像中的视差差异是产生立体视觉所必需的。传统上，视差差异指的是物体内部定义明确的点，如边缘或边界。阴影会在场景中造成亮度的突然变化，但既不是边缘也不是边界，并且其位置会随光源位置而变化。研究表明，没有视差差异但有不同阴影的视网膜图像会被立体融合，赋予成像场景深度感知。结果显示，阴影是一种重要的、此前未被描述的深度感知立体线索。
