Using S-Cone signals to detect the effects of longitudinal chromatic aberration
Using S-Cone signals to detect the effects of longitudinal chromatic aberration
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使用 S-Cone 信号检测纵向色差的影响
DOI：
10.1167/19.15.6
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发表时间：
2019
影响因子：
1.8
通讯作者：
Eskew, Rhea T.
中科院分区：
文献类型：
--
作者：
Cruz, Yesenia Taveras;He, Jingyi;Eskew, Rhea T.
纵向色差（LCA）将模糊引入视网膜图像，特别是在短波长处。LCA在不同的个体中几乎是相同的（Atchison & Smith，2000）。然而，对LCA影响的心理物理敏感性可能因人而异，因为这种敏感性可能取决于多种因素（例如，视网膜马赛克的采样）。本研究探讨了一种可能的心理物理学方法来测量不同个体对LCA影响的敏感性。在三种条件下测量对比敏感度函数（CSF）：（a）非彩色（亮度）检测，（B）S-视锥检测（S-视锥介导的对比敏感度），和（c）S-视锥色调判断（S-视锥介导的色觉）。刺激是闪烁的Gabor斑块，任务（a）中为白色/黑色，或任务（B）和（c）中为S-锥分离紫色/黄绿色。来自（B）的CSF可以被分析成两种组分。在低空间频率（SF），补丁出现五颜六色的CSF形状匹配的形状的色调CSF（任务c）。在较高的SF下，斑块不再呈现彩色，并且形状类似于消色差检测CSF（a），可能代表对由LCA引起的亮度伪影的响应。使用概率求和来联合收割机组合S-视锥色调判断和消色差检测的估计灵敏度，产生与测量的S-视锥检测灵敏度匹配的曲线。S-视锥对比度检测、S-视锥颜色感知和非彩色对比度检测之间的关系可以表示测量和建模LCA效果的特征的方式。
Longitudinal chromatic aberration (LCA) introduces blur into the retinal image, especially at short wavelengths. LCA is nearly identical in different individuals (Atchison & Smith, 2000). However, psychophysical sensitivity to the effects of LCA may vary across people, since this sensitivity is likely to depend upon multiple factors (eg, sampling by the retinal mosaic). This study explores a possible psychophysical method to measure sensitivity to the effects of LCA in different individuals. Contrast sensitivity functions (CSFs) were measured in three conditions:(a) achromatic (luminance) detection,(b) S-cone detection (S-cone mediated contrast sensitivity), and (c) S-cone hue judgment (S-cone mediated color perception). Stimuli were flickering Gabor patches, either white/black in task (a), or S-cone isolating purple/yellow-green, in (b) and (c). CSFs from (b) can be analyzed into two components. At low spatial frequencies (SFs), patches appeared colorful and the CSF shape matched the shape of the hue CSF (task c). At higher SFs, patches no longer appeared colorful and the shape was similar to the achromatic detection CSF (a), likely representing a response to a luminance artifact caused by LCA. Using probability summation to combine the estimated sensitivities of the S-cone hue judgment and achromatic detection produced curves that matched the measured S-cone detection sensitivities. The relationship between S-cone contrast detection, S-cone color perception, and achromatic contrast detection may represent a way to measure and model signatures of the effects of LCA.