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在犯罪现场中,案犯的指印遗留在光滑客体上的机会相对较多,如瓷砖、大理石、油漆面、玻璃等。由于光滑客体上的指印反差微弱,拍摄起来比较困难。通过大量的实际操作,现归纳出以下几种可见光拍摄方法,其拍摄效果非常理想。按照物质对光的反射性质不同,可以将物质分为定向反射、漫反射和混合反射三种类型。在光束照射下,三类物质的反射光在方向和强度分布上各不相同:定向反射物质的反射光只出现在反射角方向上,其他方向
At the crime scene, there are relatively few opportunities for the fingerprints of offenders to remain on smooth objects, such as ceramic tiles, marble, painted surfaces and glass. Filming is more difficult due to faint fingerprints on smooth objects. Through a large number of actual operations, are summarized the following visible light photography method, the shooting effect is very satisfactory. According to the nature of light on the reflection of different substances, the material can be divided into directional reflection, diffuse reflection and mixed reflection of three types. Under the light beam irradiation, the reflected light of the three types of substances has different directions and intensity distributions: the reflected light of the directional reflection material only appears in the direction of the reflection angle, and the other directions