Characterization of human lightness discrimination thresholds for independent spectral variations.

IF 2.4 4区 心理学 Q2 PSYCHOLOGY, EXPERIMENTAL
I-Perception Pub Date : 2024-09-26 eCollection Date: 2024-09-01 DOI:10.1177/20416695241274662
Devin Reynolds, Vijay Singh
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Abstract

The lightness of an object is an intrinsic property that depends on its surface reflectance spectrum. The visual system estimates an object's lightness from the light reflected off its surface. However, the reflected light also depends on object extrinsic properties of the scene, such as the light source. For stable perception, the visual system needs to discount the variations due to the object extrinsic properties. We characterize this perceptual stability for variation in two spectral properties of the scene: the reflectance spectra of background objects and the intensity of light sources. We measure human observers' thresholds of discriminating computer-generated images of 3D scenes based on the lightness of a spherical target object in the scene. We measured change in discrimination thresholds as we varied the reflectance spectra of the objects and the intensity of the light sources in the scene, both individually and simultaneously. For small amounts of extrinsic variations, the discrimination thresholds remained nearly constant indicating that the thresholds were dominated by observers' intrinsic representation of lightness. As extrinsic variation increased, it started affecting observers' lightness judgment and the thresholds increased. We estimated that the effects of extrinsic variations were comparable to observers' intrinsic variation in the representation of object lightness. Moreover, for simultaneous variation of these spectral properties, the increase in threshold squared compared to the no-variation condition was a linear sum of the corresponding increase in threshold squared for the individual properties, indicating that the variations from these independent sources combine linearly.

独立光谱变化的人类亮度辨别阈值的特征。
物体的亮度是一种内在属性,取决于其表面反射光谱。视觉系统通过物体表面的反射光来估计物体的亮度。然而,反射光也取决于物体在场景中的外在属性,如光源。为了获得稳定的感知,视觉系统需要忽略物体外在属性所带来的变化。我们针对场景中两种光谱属性的变化来描述这种感知稳定性:背景物体的反射光谱和光源的强度。我们根据场景中球形目标物体的亮度,测量了人类观察者辨别计算机生成的三维场景图像的阈值。我们测量了当我们单独或同时改变场景中物体的反射光谱和光源强度时辨别阈值的变化。对于少量的外在变化,分辨阈值几乎保持不变,这表明阈值受观察者对亮度的内在表征所支配。随着外在变化的增加,它开始影响观察者的亮度判断,阈值也随之增加。我们估计,外在变化对物体亮度表征的影响与观察者内在变化的影响相当。此外,当这些光谱特性同时发生变化时,与无变化条件相比,阈值平方的增加是各个特性阈值平方相应增加的线性总和,这表明这些独立来源的变化是线性结合的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
I-Perception
I-Perception PSYCHOLOGY, EXPERIMENTAL-
CiteScore
4.30
自引率
5.30%
发文量
39
审稿时长
12 weeks
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