应用微距全向光源对亚光瓷砖表面潜在指印的显现研究

STUDY ON THE APPEARANCE OF POTENTIAL FINGERPRINTS ON MATTE TILE SURFACES USING MACRO OMNIDIRECTIONAL LIGHT SOURCES

鉴于亚光瓷砖在犯罪现场的高发率和指纹对犯罪案件侦破的重要性,研究微距全向光源对亚光瓷砖表面潜在指印的显现效果。通过调整微距全向光源中的照明角度、光源颜色及相关相机参数,比对显现效果,总结显现规律。实验结果表明应用微距全向光源能全部显现出亚光瓷砖表面潜在指印,显现效果跟照明角度和光源颜色的选择有关;定向反射照明和暗视场照明显现效果优于其他照明角度;多种光源颜色的选择有助于通过光补色原理消除背景色的干扰。

In view of the high frequency of the matt ceramic tile at the crime scene and the importance of fingerprint to case detection,this paper studies the effect of the macro omnidirectional light source on the potential fingerprint of the matt tile surface.By adjusting the illumination angle,the color of the light source and the related camera parameters in the macro omnidirectional light source,the effect is compared and the law of appearance is summarized.The experimental results show that the application of the macro omnidirectional light source can all show the potential fingerprint of the matt ceramic tile surface.The visualization effect is related to the illumination angle and the choice of the color of the light source;the directional reflection illumination and the dark field illumination display are better than other illumination angles;The choice of the color of the light source helps to eliminate the interference of the background color by the principle of light complementary color.