自制漫反射拍摄装置拍摄光滑圆柱面客体上指纹

The Homemade Diffuse Reflecting Device in Camera to Shoot Fingerprints on Smooth Cylindrical Surface

利用光的漫反射原理,自制一种操作简单的装置,解决拍摄光滑圆柱面客体上的指纹直接打光出现反光带的问题。实验结果表明,采用直接打光无论采取什么角度和什么光源对光滑圆柱客体进行拍摄都很难避开强反光带,本实验采用的自制装置产生的漫反射光均匀,通过间接照明,使物证处在一个半封闭的均匀的光线环境中,可有效地避开强反光带,取得了拍摄光滑圆柱面客体表面的指纹的较好效果。

Based on the diffuse light reflection principle, a simple homemade device can solve the reflective strip problem when shooting fingerprints when directly lighting to the smooth cylindrical surface. The experimental result shows that when we light directly on the smooth cylindrical surface, the strong reflective strip can＇t be avoided in any angles or light sources. In this experiment, a homemade device is used to achieve diffuse light uniformly. Through indirect lighting, the evidence can be in the half closed light uniform enviromuent, the strong reflective strip can be effectively avoided so as to achieve the better fingerprints on the smooth cylindrical surface.