The relation between color discrimination and color constancy: When is optimal adaptation task dependent?
The relation between color discrimination and color constancy: When is optimal adaptation task dependent?
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DOI：
10.1162/neco.2007.19.10.2610
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发表时间：
2007-10-01
影响因子：
2.9
通讯作者：
Brainard, David H.
中科院分区：
文献类型：
--
作者：
Abrams, Alicia B.;Hillis, James M.;Brainard, David H.
颜色视觉支持两种不同的视觉功能：辨别力和恒定性。辨别力要求对场景中不同物体的视觉反应是不同的。恒定性要求对任何物体的视觉反应在场景中都是相同的。在场景的变化中，适应可以通过优化使用可用的响应范围来提高辨别力。类似地，适应可以通过稳定对任何固定物体的视觉反应来改善恒定性，而不是改变照明。共同的适应机制能否同时实现这两个目标？我们开发了一个理论框架来回答这个问题，并给出了几个示例计算。在所研究的例子中，当场景的变化由照明的变化组成时，答案在很大程度上是肯定的，而当场景的变化由环境中表面反射率的统计集合的变化组成时，答案就少得多了。
Color vision supports two distinct visual functions: discrimination and constancy. Discrimination requires that the visual response to distinct objects within a scene be different. Constancy requires that the visual response to any object be the same across scenes. Across changes in scene, adaptation can improve discrimination by optimizing the use of the available response range. Similarly, adaptation can improve constancy by stabilizing the visual response to any fixed object across changes in illumination. Can common mechanisms of adaptation achieve these two goals simultaneously? We develop a theoretical framework for answering this question and present several example calculations. In the examples studied, the answer is largely yes when the change of scene consists of a change in illumination and considerably less so when the change of scene consists of a change in the statistical ensemble of surface reflectances in the environment.