四岁以下儿童合成指纹：生成与生物特征评估
Synthetic Fingerprints for Children Under Four: Generation and Biometric Evaluation
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- Clarkson University（克拉克森大学）
- University of North Carolina at Charlotte（北卡罗来纳大学夏洛特分校）
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中文总结 AI 辅助
本文提出一套针对四岁以下儿童合成指纹的评估与筛选协议，从32,000个候选样本中筛选出1,985枚高质量合成指纹，验证其可支持受控研究，并强调需同时评估真实-合成相似性与合成-合成多样性。
中文摘要 AI 辅助
四岁以下儿童的指纹识别对于纵向身份应用具有重要意义，但该年龄段的研究受到真实指纹数据有限性和敏感性的制约。如果生成的样本经过仔细评估其生物特征质量、与真实训练数据的相似性以及身份多样性，合成数据可能提供有用的补充资源。本文提出了一套针对由小型儿科数据集生成的合成指纹的评估与筛选协议。该协议应用于由年龄条件生成器产生的32,000个候选样本，该生成器使用来自九名儿童的205枚指纹进行微调。候选样本使用NFIQ 2、NBIS细节点提取与匹配、指纹模式分类、与完整真实参考集的相似性以及保留合成样本间的两两相似性进行评估。经过候选筛选和最终对称两两验证后，保留了1,985枚合成指纹。最年轻的年龄组在采样预算内继续产生保留样本，而最年长的原始年龄组产生了24枚保留指纹。数据导出的两组年龄表示改善了对较年轻组的模式分布一致性。固定合成身份的重复渲染产生的基于细节点的配对分数与真实配对分数相当，尽管DINOv2纹理表示显示出显著更高的生成器内相似性。结果表明，合成儿科指纹可以支持受控研究用途，但其评估应包括真实到合成的相似性和合成到合成的多样性，且结论应保持特定于所使用的匹配器和测量方法。
英文摘要
Fingerprint recognition in children under four is of interest for longitudinal identity applications, but research in this age range is constrained by the limited availability and sensitivity of real fingerprint data. Synthetic data may provide a useful complementary resource if generated samples are carefully evaluated for biometric quality, similarity to the real training data, and identity diversity. This paper presents an evaluation and selection protocol for synthetic fingerprints generated from a small pediatric dataset. The protocol was applied to 32,000 candidates produced by an age-conditioned generator fine-tuned with 205 fingerprints from nine children. Candidates were evaluated using NFIQ 2, NBIS minutiae extrac-tion and matching, fingerprint-pattern classification, similarity to the complete real reference set, and pairwise similarity among retained synthetic samples. After candidate filtering and a final symmetric pairwise verification, 1,985 synthetic fingerprints remained. The youngest age group continued to produce retained samples within the sampling budget, whereas the oldest original age group produced 24 retained prints. A data-derived two-group age representation improved pattern-distribution agreement for the younger group. Repeated renderings of fixed synthetic iden-tities produced minutiae-based mated scores comparable to the real mated scores, although a DINOv2 texture representation showed substantially greater within-generator similarity. The results indicate that synthetic pediatric fingerprints can support controlled research use, but their evaluation should include both real-to-synthetic similarity and synthetic-to-synthetic diversity, and conclusions should remain specific to the matchers and measurements used.
