Enhanced fingerprint is the key step of the finger identification system, the effect of the enhanced quality plays an important role in the fingerprint identification system. This paper used the method of Sober operator to get the direction figure, and Sober operator was improved. Based on the direction of filter for fingerprint image enhancement, designed a set of filter to realize the enhancement of fingerprint image, and solved the problem of rotating o-verflow successful through the extended filter. The experimental results proved that the method of improving the quality of the fingerprint was quite effective.%指纹增强是指纹识别系统中的关键一步,增强效果的好坏对整个指纹识别系统有着至关重要的作用.采用基于Sobel算子的方法求取方向图,并且对Sobel算子进行了补充和改进.然后基于方向滤波的指纹图像增强方法,设计一组滤波器来实现指纹图像的增强,并且通过滤波器扩展成功解决了旋转溢出问题.实验证明,该方法的对改善指纹质量十分有效.
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