Abstract：
A facile and high-resolution enhancement of latent fingerprints (LFPs) has been developed by using a wet nitrocellulose (NC) membrane as a matrix under natural light. A clear fingerprint pattern was presented on the membrane after a fingertip touch owing to the difference in light transmittance between the ridge residues and the wet-NC-membrane background. Compared with conventional methods, this protocol can provide a higher resolution fingerprint image to extract level 3 details accurately. It is also compatible with commonly used fingerprint visualization techniques (magnetic ferric oxide powder and AgNO3. The modified membrane could be more general to realize the high-resolution visualization of LFP transferred from various substrates, even independent of light projection. Due to the excellent feasibility and reproducibility of level 3 details extracted by the wet NC membrane, the frequency distribution of the distance between adjacent sweat pores (FDDasp) could be used to effectively distinguish the fragmentary fingerprints. Finally, the level 3 features of LFPs from females and males were conveniently extracted by the wet-NC-membrane method for gender identification. The statistical results indicated that females had a higher average sweat pore density (115/9 mm2) than males (84/9 mm2). Taken together, this approach provided a high-resolution, reproducible, and accurate imaging of LFPs, which shows great promise for forensic information analysis.
摘要：
通过在自然光下使用湿的硝化纤维素（NC）膜作为基质，已经开发出了对潜在指纹（LFP）的简易和高分辨率增强。由于脊残留物和湿NC膜背景之间的透光率差异，指尖触摸后在膜上显示出清晰的指纹图案。与常规方法相比,该协议可以提供更高分辨率的指纹图像，以准确提取3级细节。它还与常用的指纹可视化技术（磁性氧化铁粉末和AgNO3）兼容。改性膜可以更普遍地实现从各种基底转移的LFP的高分辨率可视化。甚至独立于光投射。由于湿NC膜提取的3级细节具有出色的可行性和可重复性，相邻汗腺毛孔之间距离的频率分布(FDDasp)可用于有效区分碎片指纹。最后,通过湿NC膜方法方便地提取了女性和男性LFP的3级特征，用于性别鉴定。统计结果表明，女性的平均汗孔密度（115/9mm2）高于男性（84/9mm2）。一起来看,这种方法提供了高分辨率，可重复,和LFP的精确成像，这显示了法医信息分析的巨大前景。
