水泥板表面BRDF统计建模的优化与实现

分析了水泥板表面光散射的特点，结合图像处理方法计算了水泥板表面CCD图像像素的灰度梯度。通过遗传模拟退火算法反演出双向反射分布函数（BRDF）中遮蔽函数的参数，将反演的参数替换遮蔽函数中的经验参数计算水泥板表面的BRDF，并将拟合值和BRDF的实验值相比较，结果显示，随入射角增大遮蔽函数参数取反演值时的BRDF比取经验值时的BRDF精度更高，为目标表面BRDF统计建模的优化提供一种方法。

Optimization and implementation of BRDF statistic modeling on the surface of cement boards

The characteristics of optical scattering on cement board surface are analyzed, and combined with image processing the gray gradient of image element of CCD image grey-scale map on the cement board surface is computed. After being inversed the parameters of shadowing function through Genetic Simulated Annealing Algorithm, the BRDF of the cement board surface is computed,The experimental parameters of shadowing function is replaced by inversion parameters. The computed fitted value is compared with experiment value of BRDF. The result shows that the precision of BRDF is higher when the parameters of shadowing function get inversion value at an increment incident angle. This provides an efficient approach for the research of optimization of BRDF model on the target surface.