中国人民公安大学学报（自然科学版）

为研究箕型纹根基区域在千万人级数据库检索中的相似异源指纹干扰风险，选取60枚根基区域纹线清晰的箕型纹，在标注6～14个细节特征条件下发起540次检索，统计候选队列前100位内相似异源指纹的出现情况及排位表现。结果显示，540次查询中有221次检出相似异源指纹，累计获得648条相似异源指纹记录；低度、中度、高度相似分别占53.7%、26.5%和19.8%,并检出净符合点数为11的高度相似异源指纹；相似异源指纹以箕型纹为主(70.5%),同手别一致率为73.8%,同指位一致率为35.2%且指位间差异显著；高频相似区域主要分布在三角下方，并存在非根基区域与非指尖方向的相似情况；排位分析显示，同源在前占27.2%,异源在前占29.3%,均未出现占43.5%;同源与异源共现63次且同源均排位在前，异源在前均对应仅异源情形。研究表明，根基区域检索的主要风险集中于同源缺位时相似异源指纹进入候选前列及高度相似异源指纹干扰，提示鉴定人员要强化风险识别并结合其他区域特征比对。

To investigate the interference risk of close non-matches(CNMs) in ten-million-scale database searches when using the basal area of loop fingerprints, 60 loop fingerprints with clear ridge detail in the basal region were selected and 540 searches with 6-14 marked minutiae were conducted, and the occurrence and ranking performance of CNMs within the top-100 candidate list were statistically analyzed. The results showed that CNMs were retrieved in 221 of the 540 searches, yielding a total of 648 CNM records; low-, medium-, and high-similarity CNMs accounted for 53.7%, 26.5%, and 19.8%, respectively, and a high-similarity CNM with 11 corresponding points was retrieved. CNMs were predominantly loop patterns(70.5%), the same-hand consistency rate was 73.8%, and the same-finger consistency rate was 35.2% with significant differences across fingers; high-frequency similarity regions were mainly located below the delta, and similarity cases involving non-basal regions and non-tip-up directions were also observed. Ranking analysis showed that same-source-ahead outcomes accounted for 27.2%, CNM-ahead outcomes for 29.3%, and neither appearing for 43.5%; same-source and CNMs co-occurred in 63 searches and the same-source candidate always ranked ahead, and all CNM-ahead outcomes corresponded to CNM-only retrieval. It is indicated that the primary risk in basal-area searches lies in CNMs entering the top ranks when the same-source fingerprint is not retrieved, as well as interference from high-similarity CNMs, suggesting that examiners should strengthen risk awareness and conduct comparisons in conjunction with features from other fingerprint regions.