Illumination discrimination for chromatically biased illuminations: Implications for color constancy
Illumination discrimination for chromatically biased illuminations: Implications for color constancy
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DOI：
10.1167/19.3.15
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发表时间：
2019-03-01
影响因子：
1.8
通讯作者：
Hurlbert, Anya C.
中科院分区：
文献类型：
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作者：
Aston, Stacey;Radonjic, Ana;Hurlbert, Anya C.
我们测量的歧视阈值照明变化沿着不同的颜色方向开始从彩色偏置的参考照明。与会者观看了由LED灯照亮的蒙德里安纸场景。场景首先由参考照明照亮，然后进行两次比较。一个比较与参考（目标）匹配;另一个（测试）与参考不同，名义上是更蓝，更黄，更红或更绿。参与者的任务是正确选择目标。一个阶梯程序发现阈值的歧视照明变化沿着每个轴的色彩变化。九名参与者在五种不同的参考照明条件（中性、蓝色、黄色、红色和绿色）下完成了任务。我们发现，不同的颜色方向的照明变化的相对辨别阈值不同的参考照明。对于中性参考，阈值在更蓝的照明变化方向上有最高的趋势，复制了我们之前关于中性参考照明的“蓝色偏差”的报告。对于四个彩色参考（蓝色、黄色、红色和绿色），朝向中性参考的照明变化与其他方向的变化相比没有很好的区分：“中性偏置”。结果对颜色恒常性有影响：在考虑光照变化下表面外观的稳定性时，必须考虑光照的起始色度和变化方向，以及表面反射集合的色度特性。他们还建议，探索人类视觉系统是否以及如何内化自然光照变化的统计数据是值得的。
We measured discrimination thresholds for illumination changes along different chromatic directions starting from chromatically biased reference illuminations. Participants viewed a Mondrian-papered scene illuminated by LED lamps. The scene was first illuminated by a reference illumination, followed by two comparisons. One comparison matched the reference (the target); the other (the test) varied from the reference, nominally either bluer, yellower, redder, or greener. The participant's task was to correctly select the target. A staircase procedure found thresholds for discrimination of an illumination change along each axis of chromatic change. Nine participants completed the task for five different reference illumination conditions (neutral, blue, yellow, red, and green). We find that relative discrimination thresholds for different chromatic directions of illumination change vary with the reference illumination. For the neutral reference, there is a trend for thresholds to be highest in the bluer illuminationchange direction, replicating our previous reports of a "blue bias'' for neutral reference illuminations. For the four chromatic references (blue, yellow, red, and green), the change in illumination toward the neutral reference is less well discriminated than changes in the other directions: a "neutral bias.'' The results have implications for color constancy: In considering the stability of surface appearance under changes in illumination, both the starting chromaticity of the illumination and direction of change must be considered, as well as the chromatic characteristics of the surface reflectance ensemble. They also suggest it will be worthwhile to explore whether and how the human visual system has internalized the statistics of natural illumination changes.