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目的:由于玻璃光学性质比较特殊,采用常用的配光方式,拍摄玻璃上的弹孔痕迹时,经常会遇到光斑干扰和反差微弱等问题。本文探究如何利用各种技术手段消除玻璃上弹孔痕迹的光斑干扰。方法:对玻璃上弧形弹孔痕迹采用短波紫外反射摄影的方法进行提取和显现。在双灯对称照明时,用30-40度入射角照明样本。结果:在普通玻璃上用钢珠打击形成的弧形弹孔痕迹样本中,弹孔痕迹的显现率为90%以上,光斑干扰有效消除,痕迹表现完整。结论:采用短波紫外反射摄影的方法拍摄在玻璃平面上的弹孔痕迹,选择30-40度入射角照明样本,能够避免玻璃弧面上出现光斑,消除背景光斑干扰,得到较高反差的图像。能够有效提取和显现玻璃上遗留的弧形弹孔痕迹。
Objective: Due to the special optical properties of glass, the commonly used light distribution method, shooting bullet holes on the glass traces often encounter problems such as spot interference and weak contrast. This article explores how to use various techniques to eliminate spot interferences on the glass marks on the bullet hole. Methods: The marks of arc bullet holes on glass were extracted and visualized by shortwave UV reflection photography. In double-lamp symmetrical lighting, with 30-40 degree angle of illumination samples. Results: In the samples of arc bullet holes formed by steel ball striking on ordinary glass, the appearance rate of bullet hole marks was more than 90%, the spot interference was effectively eliminated and the marks were completely displayed. Conclusion: Using the method of shortwave UV reflection photography to shoot the bullet marks on the glass plane, selecting 30-40 degree incident angle illumination samples can avoid spot on the glass arc surface and eliminate the interference of background spots to obtain high contrast images. Can effectively extract and display the glass left traces of bullet holes.