The illumination correction bias of the human visual system
The illumination correction bias of the human visual system
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人类视觉系统的光照校正偏差
DOI：
10.1167/12.9.64
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发表时间：
2012
影响因子：
1.8
通讯作者：
Crichton S
中科院分区：
文献类型：
--
作者：
Crichton S
色彩恒常性是人类视觉系统在光照变化时保持物体颜色大致恒定的能力。色彩常数测量通常是在有限数量的照明条件下进行的，并且通常是在模拟而不是真实世界的场景中进行的。因此，这些结果的普遍性尚不清楚。在这里，我们测量了一个场景中真实物体在大范围照明下的色彩稳定性，无论是在日光下还是在日光下。该装置由一个光谱可调的LED照明器组成，它发出漫射的，几乎均匀的光进入一个大约42 x 60 x 75cm （hwd）的封闭盒子。实验对象通过一个视口观察盒子内部，并通过盒子正面的袖孔插入一个移动黑色键盘，通过蒙德里安纸衬里的一个切口来调整lcd显示屏的色度。他们的任务是在八种不同的平滑宽带测试照明下调整贴片，使其呈现灰色，这些照明的色度坐标在实验室空间中以日光D65为中心（距离70-120 ΔE）跨越一个椭圆。受试者最初的黑暗适应时间为5分钟。在每次试验中，受试者适应D65 10秒，然后适应测试照明10秒，其间调整色度。这个循环不断重复，直到受试者发出与“灰色”匹配的信号。平均而言，色彩稳定性不完美：调整后的“灰色”色度明显偏离照明色度，但在日光轨迹上测试照明色度明显更好。对于日光轨迹的测试色度，“偏红”和“偏黄”测试照明的误差较低。因此，颜色稳定性在不同的照明下是不同的，可能更适合于“温暖”的照明。
Colour constancy is the ability of the human visual system to keep object colours roughly constant over changes in illumination. Colour constancy measurements are typically made for a limited number of illumination conditions, and often for simulated rather than real-world scenes. The generalisability of the results is therefore unclear. Here we measure colour constancy for a scene with real objects under a broad range of illuminations, both on and off the daylight locus. The setup consists of a spectrally tunable LED illuminator that emits diffuse, nearly uniform light into an enclosed box of approximately 42 x 60 x 75cm (hwd). Subjects viewed the interior of the box through a viewport, and adjusted the chromaticity of an LCD-display patch visible through a cut-out in the Mondrian paper lining the box, using a mobile black keypad reached through an armhole in the box front. Their task was to adjust the patch to appear grey, under each of eight distinct smooth broad-band test illuminations whose chromaticity coordinates spanned an ellipse in Lab space centred on daylight D65 (at distances 70–120 ΔE). Subjects initially dark adapted for 5 minutes. On each trial, subjects adapted to D65 for 10 seconds, followed by adaptation to the test illumination for 10 seconds during which they adjusted the patch chromaticity. The cycle repeated until the subject signalled a match to" grey". On average, colour constancy was imperfect: the adjusted" grey" chromaticity deviated significantly from the illumination chromaticity, but was significantly better for test illumination chromaticities on the daylight locus. For test chromaticities off the daylight locus, errors were lower for" redder" and" yellower" test illuminations. Colour constancy thus varies across illuminations, and may be better adapted to" warm" illuminations.