Color Constancy

颜色恒常性

• 批准号: 7923632
• 负责人: David H Brainard
• 金额: $ 14.93万
• 依托单位: UNIVERSITY OF PENNSYLVANIA
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-30 至 2011-09-29
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7923632
• 关键词: Accounting; Address; Affect; Appearance; Automobile Driving; Behavioral; Color; Color Perception; Color Visions; Complex; Data; Detection; Diffuse; Discrimination; Ensure; Environment; Eye; Foundations; Grant; Hand; Human; Judgment; Light; Lighting; Link; Measurement; Measures; Modeling; Optics; Perception; Performance; Play; Process; Property; Psychophysiology; Research; Role; Shapes; Stimulus; Surface; System; Technology; Testing; Variant; Vision; Visual system structure; Work; base; color constancy; color processing; computer framework; design; insight; neuromechanism; object shape; physical property; relating to nervous system; research study; theories

PROVIDED. Vision is useful because it informs us about physical properties of the environment. In the case of color, one important function is to provide information about object identity - color isgenerally considered a perceptual correlate of object surface reflectance. For color to be a reliable guide to object identity, the perceived color of an object must remain stable across variations in the scenes in which it is viewed. This requirement is non-trivial because the light reflected to the eye varies with .scene factors that are extrinsic to the object, such as the.spectrum of the illumination and the reflectance of nearby objects.' The visual system adjusts to stabilize (partially) object color appearance against changes in these extrinsic factors, a phenomenon called color constancy. This proposal consists of experiments designed to study object color appearance and its constancy. Golor constancy is an example of a larger class of perceptual constancies (e.g. size constancy and shape constancy) that together allow us to perceive a stable physical world. As such, a detailed characterization of the color system may provide insights that generalize beyond color per se. The. proposed research consists of behavioral experiments with human observers that will allow a functional characterization of.how we perceive object color. Questions to be addressed include a) how does the visual system integrate information across the surface of a three-dimensional object to arrive at an overall percept of object color? b) how is this process affected by variations in the material properties of objects (i.e. variations in the object's bidirectional reflectance distribution function)? c) how stable is object color perception across variation in object shape and pose? d) how does object color perception depend on geometrical and spectral properties of the illumination? e) can we model color perception within a computational framework derived from inverse optics? and f) what role do mechanisms of adaptation tapped by objective threshold measurements play in object color constancy across changes in complex scenes? This research should help us understand how color vision works in the real world and provide a foundation for clarifying the neural processing of color. . v

提供了 视觉是有用的，因为它告诉我们环境的物理特性。的情况下 颜色，一个重要的功能是提供有关对象身份的信息-颜色通常是 被认为是物体表面反射率的感知相关性。颜色是一个可靠的指南， 对象标识，对象的感知颜色必须在场景的变化中保持稳定 在其中观看。这个要求是不平凡的，因为反射到眼睛的光是变化的， 利用对物体来说是外在的场景因素，例如照明的光谱和 附近物体的反射率。视觉系统调整以稳定（部分）物体颜色 外观对这些外在因素的变化，一种现象称为颜色恒常性。这 该提案包括旨在研究物体颜色外观及其恒定性的实验。 Golor恒常性是更大类别的感知恒常性（例如，大小恒常性和 形状恒常性），共同让我们感知到一个稳定的物理世界。因此，详细的 颜色系统的表征可以提供概括颜色本身之外的见解。的. 拟议的研究包括与人类观察者的行为实验， of.how我们感知物体的颜色.要解决的问题包括a） 视觉系统如何整合三维物体表面的信息 对物体颜色的整体认知B）该过程如何受到 物体的材料特性（即物体的双向反射分布的变化 功能）？c）物体颜色感知在物体形状和姿态的变化中有多稳定？d）、 物体的颜色感觉如何依赖于照明的几何和光谱特性？ e）我们能否在从逆光学导出的计算框架内对颜色感知进行建模？ （f）通过客观阈值测量挖掘的适应机制在以下方面发挥什么作用： 在复杂场景中物体颜色的变化不变？这项研究应该能帮助我们 了解颜色视觉如何在真实的世界中工作，并为澄清 颜色的神经处理. v