变形指纹的矫正与应用研究  

Analysis and Application of Distorted Fingerprint

作　　者：林弟华 张明 

机构地区：[1]广西梧州市公安局物证鉴定所,广西梧州543000 [2]广西梧州市公安局长洲区分局刑侦大队,广西梧州543000

出　　处：《刑事技术》2016年第6期515-516,共2页Forensic Science and Technology

摘　　要：以直接粘取法制备标准指纹,作为变形指纹研究的比较参照和依据,计算变形指纹的变形量,确定指纹变形之间存在的关联规律,即指纹在其相互垂直方向上的变形量基本相同,但以相反方式呈现。在计算机指纹自动识别系统中,若现场指纹与入库的捺印指纹越接近,其比对得分就越高;或者其细节特征数量越多,得分亦越高。但有时现场指纹因变形并不能直接与库存指纹相匹配。故在提取的现场指纹细节特征数量不能增多时,若能对现场指纹作矫正,使其提高应有的分值,则可提高比中率,增加物证的证据力。Standard fingerprint was made by the direct picking-up and was taken as the reference and reliance for both the study and comparison of distorted fingerprint. The variance between standard fingerprint and the distorted one was calculated so as to determine the regularity among the variants. It was found that the variance is inversely equal on the mutually vertical directions of a fingerprint. For a scene fingerprint, the closer it matches to the stored one in computer automatic fingerprint identification system, and the more detailed features it discloses the higher matching score it gets. However, there are many occasions where the scene fingerprint, due to distortion, is not able to match to the one in computer automatic fingerprint identification system. Under occurrence of these circumstances plus no more available minutiae, a scene fingerprint, albeit distorted, can still be about to close to its original appearance when eliminated its variance through calibration, therefore its matching rate will be elevated and evidential power enhanced accordingly.

关 键 词：标准指纹 变形指纹 矫正系数 

分 类 号：D918.91[政治法律—法学]