基于细微密度分布的折痕检测与修复

Wen Jian, Yujie Zhou, Hongming Liu, N. Zhu
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引用次数: 0

摘要

折痕的存在会致命地破坏指纹的结构和纹理,具体来说,折痕会分裂脊线,产生一系列伪细节。因此,折痕会明显降低指纹识别算法的准确率,特别是在目前领先的基于细节匹配的指纹识别算法中。在这项工作中,我们提出了一种新的方法来检测和修复折痕。首先,从微密度分布中,我们筛选出较大的微密度区域作为折痕候选者。我们选择满足一定约束条件的候选区域作为真折痕区域,然后将其分为大方向差折痕区域(LODCAs)和小方向差折痕区域(SODCAs)。其次,我们在SODCA中使用逐步逼近方法重新连接断脊线,而在LODCA中,三角约束方法更适用。实验结果表明,该算法可以有效地检测和修复折痕,并且在较少的额外计算的情况下,大大提高了识别精度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Crease Detection and Repair Based on Minutia Density Distribution
The existence of crease fatally destroys fingerprint structure and texture, concretely, creases will dissever ridgelines and produce a series of pseudo minutiae. Thus, creases will reduce the accuracy of the fingerprint recognition algorithm obviously, especially in the leading algorithm based on minutiae-matching. In this work, we propose a novel approach for detecting and repairing the creases. First, from the minutia density distribution, we sift out large minutia density areas as the crease candidates. We select the candidates meeting some constraints as true crease areas, then we divide them into Large Orientation Difference Crease Areas (LODCAs) and Small Orientation Difference Crease Areas (SODCAs). Secondly, we reconnect the broken ridgelines using stepwise approximation approach in SODCA, while in LODCA, triangular constraint approach is more applicable. The experimental results indicate that the algorithm can detect and repair creases effectively and the recognition accuracy improves greatly with wee additional calculation.
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