修正变形指纹提高比中概率的案例思考  

Matching Probability Improved by Rectifying Deformed Fingerprints

作　　者：陶桂兰[1] 董大刚 TAO Guilan;DONG Dagang(Criminal Investigation Detachment of Dalian Public Security Bureau,Dalian 116031,Liaoning,China;Criminal Technical Team of Hulin Public Security Bureau,Hulin 158400,Heilongjiang,China)

机构地区：[1]辽宁省大连市公安局刑侦支队,辽宁大连116031 [2]黑龙江省虎林市公安局刑事技术大队,黑龙江虎林158400

出　　处：《刑事技术》2019年第6期562-564,共3页Forensic Science and Technology

摘　　要：现场指纹受环境、犯罪嫌疑人接触客体种类、作案过程中用力程度等因素影响,常常会发生一定变形,变形现场指纹的特征点相对位置间距会发生变化,在指纹自动识别系统查询比对过程中比中概率降低。利用图像处理软件对变形现场指纹进行合理修正是一种提高比中概率的有效方法。笔者利用Photoshop_CS5图像处理软件对一枚变形现场指纹进行修正,修正前、后在同一指纹自动识别系统进行比对检验,样本指纹分别位于第134位和第1位,表明合理修正变形指纹可提高指纹比中概率。The fi ngerprints found at the scene often occur of deformation by the infl uential factors from,e.g.,environment,variety of the objects that suspects contacted,intensity of the force exerted with the fi ngerprint owner,hence resulting in the feature points of the fingerprints to change their juxtapositions so that the automatic fingerprint identification system will have lower matching probability due to the incompetent query between the relevant fi ngerprints.If the deformed fi ngerprint can be rectified,their matching probability could be improved.Here,a deformed fingerprint extracted from scene was corrected by Photoshop_CS5,one image processing software.From comparison against the deformed fi ngerprint with and without correction through automatic fi ngerprint recognition system,the sample fi ngerprint was respectively matched to the candidate’s at 1st place forwarded from the one at 134th.Thus,rational correction of deformed fi ngerprints can truly improve the matching probability between fi ngerprints.

关 键 词：指纹自动识别系统 细节点特征 修正变形指纹 比中概率 

分 类 号：DF794.1[政治法律—诉讼法学]