Parameter inversion of shadowing function in light scattering model

A method of acquiring parameters of the five-parameter BRDF statistic model in object sample using the genetic simulated annealing algorithm was introduced. using four parameters in the shadowing function as unknown parameters in BRDF model, a nine-parameter BRDF model was obtained when the genetic simulated annealing algorithm was applied to the parameter reversion of the BRDF statistic model of the object surface according to the BRDF experimental data at laser wavelength 1.06 m. The results show that, mean square errors of the nine -parameter BRDF model were small compared with that of five-parameter BRDF model. The distribution of shadowing function with scattering angle is obtained for different incident angles by retrieving the four parameters of shadowing function, which reflect the surface roughness of object sample.