This paper is concerned with the derivation of a progression of shadow-free image representations. First we show that adopting certain assumptions about lights and cameras leads to a 1-d, grey-scale image representation which is illuminant inva

色坐标计算绘图软件，C I E 1 9 3 1，简单易用(Chromaticity,Color coordinate calculation and drawing software, C I E 1931, easy to use)