SHAPE REPRESENTATION AND MULTIPLE DEPTH CUES

描述(研究人员摘要)：生物视觉系统使 使用多种深度线索，包括遮挡、纹理、透视、 运动视差、视差、明暗处理等。三个中的第一个 指导这里提出的工作的主题是一个理想的深度观察者 对来自不同深度的信息质量敏感 特定场景中的线索。第二个主题是理想的深度 观察者也对信息的逻辑类型敏感(在 测量理论意义)可从不同的深度线索获得。这个 调查人员会争辩说，不同类型的深度信息必须 在合并之前被提升为普通类型，并且这一过程 促进可以解释许多观察到的深度线索相互作用。第三 主题涉及刺激的真实性(它们有多相似 如果一个理想的深度观测者对 可以从不同的深度线索获得信息的质量，然后使用 贫乏或扭曲的深度刺激本身就会改变进程 深度加工。 提出的实验工作将利用硬件和软件 能够产生高度逼真、可控的观看条件 涉及大型显示、观察者运动和精确建模的场景 和表面属性。所使用的实验方法是基于 摄动分析方法，允许对系统进行分析 潜在地对刺激中的扭曲和不一致做出反应。这个 拟开展的研究工作主要包括四个方面。(1)调查人员 将测试特定CUE模型的一般适用性 组合，线性模型，调查人员之前已经 展示了纹理、运动和立体声的组合。这将是 包括使用额外的深度线索估计深度以及 应用于其他任务，包括确定绝对空间 定位和二维特征定位。(2)调查人员将审查 人类深度组合规则在统计上是否稳健 指示与以下内容不一致的深度值的贴现感 其他线索。(3)线索的时间进程和限度的探索 将使用丰富的3D显示器进行绝对深度校准 和开环指向任务。(4)实验将探索 人类观察者使用的深度表示。

DESCRIPTION (Investigator's Abstract): Biological visual systems make use of multiple depth cues including occlusion, texture, perspective, motion parallax, disparity, shading, and so on. The first of three themes that guide the work proposed here is that an ideal depth observer is sensitive to the quality of information available from different depth cues in a particular scene. The second theme is that the ideal depth observer is sensitive also to the logical type of information (in a measurement-theoretic sense) available from different depth cues. The investigators will argue that depth information of different types must be promoted to a common type before being combined, and this process of promotion may explain many observed depth cue interactions. The third theme concerns the veridicality of stimuli (how closely they resemble 'real world' scenes).If an ideal depth observer is sensitive to the quality of information available from different depth cues, then the use of impoverished or distorted depth stimuli can in itself alter the course of depth processing. The experimental work proposed will make use of hardware and software capable of generating highly realistic, controllable viewing conditions involving large displays, observer motion, and accurately modeled scene and surface properties. The experimental methods used are based on perturbation analysis methods that permit analysis of a system that can potentially react to distortions and inconsistencies in stimuli. The proposed research consists of four major tasks. (1) The investigators will test the general applicability of a particular model of cue combination, the linear model, which the investigators have previously demonstrated for combinations of texture, motion and stereo. This will involve estimation of depth using additional depth cues as well as applications to other tasks including determination of absolute spatial location and 2D feature localization. (2) The investigators will examine whether the human depth combination rule is statistically robust in the sense of discounting cues that indicate depth values discrepant from other cues. (3) Exploration of the time course and limits of cue calibration for absolute depth will be carried out using rich 3D displays and an open-loop pointing task. (4) Experiments will probe the forms of depth representation used by human observers.