关键词: 指纹增强, Hermite滤波器, 奇异点区域, 纹线频率

Abstract: Fingerprint enhancement aims to improve fingerprint image quality, and enhance the performance of fingerprint recognition system. This paper proposed an approach to fingerprint image enhancement based on Hermite filter. The algorithm calculated ridge orientation by using gradient-formula method, and calculated ridge frequency by using the frequency spectrum characteristic of fingerprint image block. With ridge orientation and frequency as the main parameters of filter, the algorithm made use of Hermite filter with good bandpass property and made use of low-pass filter with changeable angle bandwidth to implement the filtering, enhancing the texture definition effectively and better avoiding blocking effect in singular point area. The experimental results show that the proposed algorithm achieves good image enhancement.

Key words: Fingerprint Enhancement, Hermite Filter, Singular Point Area, Ridge Frequency