【摘要】 在实时指纹识别系统中 ,指纹图像的增强算法起着至关重要的作用。但通常的增强算法经常要花费较多的时间 ,或者不适用于指纹频率区别较大的数据库。在大量样本分析的基础上 ,根据指纹纹理频率参数的变化动态调整方向滤波模板的大小对指纹图像进行有效的增强处理 ,对不同的纹理方向专门采用了查表的方法 ,减小了时间消耗。实验表明 ,这种算法能够快速有效的增强指纹图像 ,尤其适用于指纹频率区别较大的指纹样本库中 ,并在实时指纹鉴别系统中得到了应用更多还原

【Abstract】 In a real time automatic fingerprint identification system (AFIS), the image enhancement algorithm plays a key important role and should be effective as well as fast. However, many image enhancement algorithms are time consuming or not effective for fingerprint samples when their frequencies vary. Analysis of a large number of fingerprint samples suggests that the mask size of the oriented filter should be changed in real time with fingerprint frequency variations. The operation time is reduced with a special look up table method in the fingerprint enhancement algorithm. Experimental results show that the enhancement algorithm is effective and fast, and is applicable with various fingerprint sample frequencies. The enhancement algorithm has been integrated into a practical AFIS system.更多还原