增强现实系统真实环境整体光照模型的建立，是增强现实技术研究的重要部分。提出了一种新的方法，根据注册图像中标志物的明暗状况。利用计算机图形学的光照明模型计算方法进行逆推，可以较为方便地建立增强现实系统光照模型。算法简单易行，并且适应性较强。

To construct lighting model of the real world is one of the critical technologies in augment reality. The theory of lighting modeling used in Computer Graphics(CG) is applied in our research. At first, the position of the real light-source is conjectured from the lighting and shade of the registration image elementarily by using ray tracking algorithm. Then the virtual light-source and virtual fiducial are constructed in the CG environment, in which, Phong model is used to draw the light effect. By comparing the CG scene with the real image, we can modify the parameters of lighting model over and over again, until the lighting effect of the CG scene is similar to that of the real image. It is proven that this method works well in the indoor AR system. Our method could be used feasibly in most applications after some improvement.