针对大型金属桶内底部高反射表面缺陷检测难度大的问题,提出了一种内窥式的机器视觉检测方法。综合考虑金属桶的结构特性和表面特性,结合双向散射分布函数,对桶底的非正向照明方案进行了仿真研究。结果表明,在理论条件下,桶底照度呈现良好的均匀性。对应的实验验证结果显示,实际照明情况与仿真结果基本一致,相比于一般照明方式,图像的质量得到了有效提高。

In view of the difficulty in detecting the high reflective surface defects in the bottom of a large metal barrel, an endoscopic illumination scheme is proposed. Comprehensively considering the structural and surface characteristics of the metal barrel, a simulation study on the non-forward illumination scheme of the barrel bottom is conducted based on the bidirectional scattering distribution function (BSDF). The results show that the illuminance at the bottom of the barrel presents a good uniformity under theoretical conditions. The corresponding experimental verification results indicate that the actual illumination conditions are basically the same as the simulation results. The proposed scheme can obtain better image quality than the general illumination scheme.