Influences of lighting time course and background on categorical colour constancy with RGB‐LED light sources
Influences of lighting time course and background on categorical colour constancy with RGB‐LED light sources
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DOI：
10.1002/col.22392
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发表时间：
2019-10
影响因子：
1.4
通讯作者：
Ruiqing Ma;N. Liao;Pengfei Yan;K. Shinomori
中科院分区：
文献类型：
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作者：
Ruiqing Ma;N. Liao;Pengfei Yan;K. Shinomori
一些先前的研究已经使用在监视器上模拟的二维平面刺激来调查照明时间过程和观看背景对颜色恒定性的影响。在本研究中，我们调查了类别颜色恒常性在真实的场景通过操纵（a）照明时间过程，即适应期的光源（短暂适应或完全适应）和（B）的背景结构的刺激（一个均匀的灰色背景，约25%的光谱反射率或多色背景组成的麦克白Colorimetry和一些水果模型）。中性（u′= 0.1994，v ′= 0.4671）、红色（u′= 0.2433，v ′= 0.4622）、绿色（u′= 0.1525，v ′= 0.4697）、蓝色（u′= 0.2049，v ′= 0.4198）和黄色（u′= 0.1892，v ′= 0.5112）发光体由RGB-LED灯产生。对于每一个彩色照明条件，主题分类240表面孟塞尔值5/在四个观看条件下的不同组合的照明时间过程和背景结构。共有7名受试者参与了红色和绿色发光体的实验，5名受试者参与了蓝色和黄色发光体的实验。结果表明，在短暂适应和灰色背景条件下，稳定性指数最低（0.66），在完全适应和多色背景条件下，稳定性指数最高（0.74）。结果表明，单独增加适应期或在背景中添加彩色线索并进行短暂的适应有助于提高颜色恒定性，并且在长时间呈现光源的情况下对周围有色物体进行时间参考也可能有助于获得颜色恒定性。
Some previous studies have investigated the influence of the lighting time course and viewing background on the colour constancy using two‐dimensional flat stimuli simulated on a monitor. In the present study, we investigated the categorical colour constancy in real scenes by manipulating (a) the lighting time course, that is, adaptation period to the illuminant (brief adaptation or complete adaptation) and (b) the background structure of a stimulus (a uniform gray background with an approximately 25% spectral reflectance or a multicolour background consisting of the Macbeth ColorChecker and some fruit models). The neutral (u′= 0.1994,v′= 0.4671), red (u′= 0.2433,v′= 0.4622), green (u′= 0.1525,v′= 0.4697), blue (u′= 0.2049,v′= 0.4198), and yellow (u′= 0.1892,v′= 0.5112) illuminants were produced by an RGB‐LED lamp. For each chromatic illumination condition, subjects categorized 240 surfaces with Munsell Value 5/ in four viewing conditions with different combinations of the lighting time course and the background structure. A total of seven subjects participated in experiments with red and green illuminants and five subjects with blue and yellow illuminants. The results showed that the constancy index was the lowest (0.66) in the brief adaptation and gray background condition and the highest (0.74) in the complete adaptation and multicolour background condition. The results suggest that increasing the adaptation period alone or adding chromatic cues in the background with a brief adaptation can help to improve the colour constancy, and a time‐taking reference to surrounding coloured objects with the long presentation of the illuminant may also contribute to obtaining colour constancy.