太空场景光照仿真方法研究

摘要

A lighting simulation method for the real space scene was presented for achieving realistic astronaut visual simulation with the particular of the space flight training simulator. Firstly, the components of illumination sources were analyzed by modeling lighting environment of spacecraft. By combining these components, the outer space was rendered, and the luminance of the scene was optimized according to the characteristics of lighting environment. Compared with the photo captured by astronaut, it drew a conclusion that this lighting simulation method not only enhanced the brightness of the scene remarkably, but also rendered the scene vividly.%建立一个逼真的太空环境,在航天训练模拟器的设计中,存在对星空光照和大气散射特性逼真度差的问题.为解决上述问题,提出了一种太空场景的光照仿真方法.首先对太空场景中的有效光源进行建模,分析各光源的光照贡献情况.然后在光照模型基础上,对航天器处于地球本影区和伪本影区的情况分别进行计算,并考虑地球漫反射光对环境光的影响.最后结合太空光照环境特点和视觉系统生理特性,采用色调映射算法进行场景显示亮度优化.对比真实太空图像进行验证,表明改进方法可以有效提高太空场景仿真的逼真度,所采用的亮度调节方法也切实可行,不仅实现简单高效,而且计算灵活性好,很好地满足了仿真训练的真实感和实时性的指标要求.