谈放大指纹特征昀几种方法

识别指纹微观的形态特征,需要借助放大、显微等技术手段对指纹进行观察。手工描绘放大法是用手工方法将观察到的实物指纹,用铅笔在纸上做一个3倍~5倍的放大图像;比例尺放大法是利用等边三角形等比放大原理,对指纹进行等比放大;胶片放大法是利用照相技术将指纹在胶片上反映出来,是一种固定和提取现场指纹最有效的方法;指纹自动识别系统放大法是通过计算机模糊比较的方法,将两个指纹的模板进行比较,计算出它们的相似程度,最终得到放大的指纹。

Several Methods of Magnifying Fingerprints Characteristics

To identify the characteristics of micro fingerprints,it's necessary to study the prints with a means of magnifying or minifying.Manual drawing magnifying method includes graph drawing and non-graph drawing.Scale magnifying method is to magnify the prints with the principle of equilateral proportion.Film magnifying,a typical and most efficient method,is to reflect the prints on the film with the principle of photographing.Prints auto identifying system magnifying is to compare two prints stencils and calculate their similarity and get the magnified prints with the principle of computer fuzzy comparison.