Object-Colour Manifold
Object-Colour Manifold
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DOI：
10.1007/s11263-012-0555-2
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发表时间：
2012
影响因子：
19.5
通讯作者：
A. Logvinenko
中科院分区：
文献类型：
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作者：
A. Logvinenko
色度学可以预测哪些灯光看起来很像。这种光被称为同色异构体。如果两个灯光具有相同的三刺激值，则它们是同色异谱的。使用三刺激值作为笛卡尔坐标，可以将光线颜色表示为3D空间(称为色度空间)中的点。所有的光色构成了一个三维流形，它可以表示为色度空间中的一个圆锥体。此外，色度学还声称，被相同光线照亮的反射物体一旦反射同色异谱光，看起来就会很相似。在照明固定的情况下，所有物体的颜色都被表示为嵌入在浅色锥中的闭合实体。然而，如本文所述，反射光同色异谱不能保证反射对象看起来相同(称为颜色等效性)，特别是当有多个光源时。此外，颜色等值不能从同色异谱中得出。在不同的照明下，反射物体的颜色由六个数字(称为其六个刺激值)指定，这些数字可以通过实验确定。使用六个刺激值，可以将由各种光源照明的所有反射对象的颜色表示为通过5D球的圆锥体(没有顶点)。
Colorimetry can predict which lights will look alike. Such lights are called metameric. Two lights are metameric if they have the same tri-stimulus values. Using the tri-stimulus values as Cartesian coordinates one can represent light colours as points in a 3D space (referred to as the colorimetric space). All the light colours make a tri-dimensional manifold which can be represented as a circular cone in the colorimetric space. Furthermore, colorimetry also claims that reflecting objects illuminated by the same light will look alike as soon as they reflect metameric lights. All the object colours are then represented as a closed solid inscribed in the light colour cone provided the illumination is fixed. However, as argued in this article, the reflected light metamerism does not guarantee that the reflecting objects will look identical (referred to as colour equivalence), especially when there are multiple illuminants. Moreover, colour equivalence cannot be derived from metamerism. The colour of a reflecting object under various illuminations is shown to be specified by six numbers (referred to as its six-stimulus values) that can be established by experiment. Using the six-stimulus values one can represent the colours of all the reflecting objects illuminated by various illuminants as a cone (without a vertex) through a 5D ball.