Stereoscopic Surface Perception

描述(申请人提供)：视觉系统面临的一个基本问题是从2D视网膜图像提供关于3D环境的信息。也许最准确的信息来源来自两只眼睛有不同的有利位置这一事实。这意味着两个视网膜上的图像并不相同。视网膜上匹配特征的位置之间的差异是双眼差异，从这些差异中感知深度的能力是立体视觉。从视差推断3D布局的研究大致分为两大类：1)从视网膜图像估计视差；2)解释估计的视差。具体目标1涉及差异估计，具体目标2和3涉及差异解释。在与特定目标1相关的实验和建模中，我们将研究视差估计机制的空间和色度特性。例如，我们将确定最高立体分辨率、视差梯度限制以及与彩色刺激相对的亮度的立体灵敏度差异是否源于使用双目匹配算法，该算法提供深度图的分段正面估计。在其中一些实验中，我们将改善眼睛的光学性能，并调查立体视觉的成本和好处。在与特定目标2相关的实验和建模中，我们将调查视差和纹理倾斜信号是否组合成加权和(用于估计倾斜)和差异(用于评估纹理一致性)。我们还将研究视差和纹理信号可靠性的变化如何影响这两个过程。在与特定目标3相关的实验中，我们将研究一种广泛经验的感知现象：适应由于一只眼睛的图像水平放大而导致的3D扭曲。我们将试图找出适应机制，并确定受试者是否可以同时适应两种状态。我们还将研究如何适应眼睛图像的垂直放大。

DESCRIPTION (provided by applicant): A fundamental problem faced by the visual system is providing information about the 3d environment from the 2d retinal images. Perhaps the most precise source of information arises from the fact that the two eyes have different vantage points. This means that images on the two retinae are not identical. The differences between the locations of matching features on the retinae are binocular disparities and the ability to perceive depth from these disparities is stereopsis. Investigations of inferring 3d layout from disparity fall into two general categories: 1) the estimation of disparity from the retinal images and 2) the interpretation of the estimated disparity. Specific Aim 1 concerns disparity estimation and Specific Aims 2 and 3 concern disparity interpretation. In the experiments and modeling associated with Specific Aim 1, we will examine the spatial and chromatic properties of disparity-estimating mechanisms. We will, for example, determine whether the highest stereo resolution, the disparity-gradient limit, and the difference in stereo sensitivity with luminance as opposed to chromatic stimuli result from using a binocular-matching algorithm that provides piecewise-frontal estimates of the depth map. In some of these experiments, we will improve the optics of the eye and investigate the costs and benefits to stereovision. In the experiments and modeling associated with Specific Aim 2, we will investigate whether disparity and texture slants signals are combined in a weighted sum (for estimating slant) and a difference (for assessing texture homogeneity). We will also examine how changes in the reliability of disparity and texture signals affect these two processes. In the experiments associated with Specific Aim 3, we will study a widely experienced perceptual phenomenon: adaptation to the 3d distortions that result from horizontal magnification of one eye's image. We will try to pinpoint the adaptation mechanism and to determine whether subjects can adapt to two states simultaneously. We will also examine adaptation to a vertical magnification of one's eye image.