THE RELATION BETWEEN CELESTIAL COLOR GRADIENTS AND THE POSITION OF THE SUN, WITH REGARD TO THE SUN COMPASS
THE RELATION BETWEEN CELESTIAL COLOR GRADIENTS AND THE POSITION OF THE SUN, WITH REGARD TO THE SUN COMPASS
复制标题
DOI：
10.1016/0042-6989(94)90148-1
复制
发表时间：
1994-06-01
期刊：
影响因子：
1.8
通讯作者：
NUBOER, JFW
中科院分区：
文献类型：
--
作者：
COEMANS, MAJM;HZN, JJV;NUBOER, JFW
在晴朗的日子里，测量了大气散射引起的天空颜色梯度。结果表明，在短波长范围内光谱强度分布的形状是稳定的，而在较长波长范围内的分布取决于测量方向。我们将这些相对强度差表示为光谱对比度。绘制为相对于太阳位置的角度差的函数的对比度建立了平滑的渐变。我们认为鸽子对紫外线的敏感度是色彩处理系统的一部分，该系统很好地适应了利用这些梯度来得出太阳的位置。
Colour gradients along the sky caused by atmospheric scattering were measured on sunny days. It is concluded that whereas the shape of the spectral intensity distribution in the short wavelength range is stable, the distribution at longer wavelengths depends on the direction of measurement. We expressed these relative intensity differences as a spectral contrast. This contrast plotted as a function of angular difference with respect to the position of the sun establishes a smooth gradient. We suggest that the pigeon's UV sensitivity is part of a colour processing system, which is well adapted to employ these gradients in order to derive the sun's position.