Tang J Y, Sang Z Q
Appl Opt. 2001 Oct 10;40(29):5183-91. doi: 10.1364/ao.40.005183.
Lighting simulation and image synthesis for outdoor scenes are difficult because of the geometric complexity and the presence of lighting interaction and atmospheric extinction in the outdoor environment. An efficient method of image synthesis by use of a linear combination of basic images is presented. With respect to linearity of the illumination function, the coefficients of basic images of various Sun positions and sky situations can be calculated. Furthermore, the relationship among visibility distance, image contrast, and resolution is addressed so that the desired images can be generated under all weather conditions. It is shown that a uniform formula is available and feasible for fixed scene and camera geometry.
由于户外场景的几何复杂性以及户外环境中光照交互和大气消光的存在，户外场景的光照模拟和图像合成具有一定难度。本文提出了一种利用基本图像线性组合进行图像合成的有效方法。根据光照函数的线性特性，可以计算出不同太阳位置和天空状况下基本图像的系数。此外，还探讨了能见距离、图像对比度和分辨率之间的关系，以便在所有天气条件下生成所需图像。结果表明，对于固定的场景和相机几何结构，存在一个统一的公式，该公式是可行的。
