Sheets H David, Torres Anne, Langenburg Glenn, Bush Peter J, Bush Mary A
Department of Physics, Canisius College, 2001 Main Street, Buffalo, NY, 14208.
J Forensic Sci. 2014 Jul;59(4):1113-20. doi: 10.1111/1556-4029.12503. Epub 2014 May 20.
Friction ridge impression appearance can be affected due to the type of surface touched and pressure exerted during deposition. Understanding the magnitude of alterations, regions affected, and systematic/detectable changes occurring would provide useful information. Geometric morphometric techniques were used to statistically characterize these changes. One hundred and fourteen prints were obtained from a single volunteer and impressed with heavy, normal, and light pressure on computer paper, soft gloss paper, 10-print card stock, and retabs. Six hundred prints from 10 volunteers were rolled with heavy, normal, and light pressure on soft gloss paper and 10-print card stock. Results indicate that while different substrates/pressure levels produced small systematic changes in fingerprints, the changes were small in magnitude: roughly the width of one ridge. There were no detectable changes in the degree of random variability of prints associated with either pressure or substrate. In conclusion, the prints transferred reliably regardless of pressure or substrate.
摩擦嵴纹印痕外观可能会因接触的表面类型以及沉积过程中施加的压力而受到影响。了解改变的程度、受影响的区域以及发生的系统性/可检测到的变化将提供有用的信息。采用几何形态测量技术对这些变化进行统计表征。从一名志愿者处获取了114份指纹，并分别在计算机纸、软光泽纸、十指纹卡片纸和指纹采集卡上以重压、正常压力和轻压进行捺印。从10名志愿者处获取了600份指纹，并分别在软光泽纸和十指纹卡片纸上以重压、正常压力和轻压进行滚印。结果表明，虽然不同的基材/压力水平在指纹上产生了微小的系统性变化，但变化幅度很小：大约为一条嵴纹的宽度。与压力或基材相关的指纹随机变异性程度没有可检测到的变化。总之，无论压力或基材如何，指纹转移都很可靠。
