计算机科学 ›› 2016, Vol. 43 ›› Issue (2): 35-37.doi: 10.11896/j.issn.1002-137X.2016.02.007
• 2015年中国计算机学会人工智能会议 • 上一篇 下一篇
郭西风,祝恩,周思航,申小龙,殷建平
GUO Xi-feng, ZHU En, ZHOU Si-hang, SHEN Xiao-long and YIN Jian-ping
摘要: 指纹参考点在指纹注册和识别过程中非常重要,能够有效减少拥有大规模指纹库的自动指纹识别系统的识别时间。指纹焦点是一种很稳定的参考点,而现有检测指纹焦点的方法的精度还有很大提升空间。基于从方向场生成的交点的权重信息,提出了一种精确的指纹焦点检测方法。首先,提出了交点权重图的概念以及从指纹方向场计算该图的方法。在分块方向场上,各个块中经过块中心垂直于块方向的直线两两相交得到一些交点,为每个交点根据对其期望焦点位置的贡献赋予一个权重,得到交点权重图。该图基本能保证理想的焦点位于其最大密度区域,从而提高焦点检测算法的精度和稳定性。然后将交点权重图用于迭代算法中,实现对焦点的精确检测。最后,在 FVC2000 Db2a 指纹库上进行了实验,结果表明提出的方法在精度上比其他方法有明显优势,时间开销也在可接受的范围内。
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