根据指纹图像上纹路的方向特性,提出一种伪线性的基于方向扩散方程的指纹增强方法.首先总结原有相关扩散方程的优缺点,并针对相关扩散方程在方向信息较复杂情况下,不能够沿着指纹纹路方向扩散提出改进方法.改进后的方法具有更好的方向扩散特性,在去噪和保持指纹图像纹路信息方面表现更优.最后,针对改进的方法具有非线性偏微分方程的形式,计算复杂度较高的不足,提出伪线性形式的方向扩散方程.该方法具有线性算子的优点、计算量小,有利于指纹识别实时系统应用.
Abstract
A pseudolinear directional diffusion filter is proposed to enhance the fingerprint images according to their directional infomation. In this paper, the defects of coherent diffusion expressed in a divergence form are discussed which produce a artificial structure and a new nonlinear directional diffusion PDE is proposed to overcome its drawbacks. The new algorithm outperforms the coherent diffusion based image enhancement in denoising ability and structure information preservation. Finally, a pseudolinear expression of the method is proposed and discussed to decrease the computational burden. The pseudolinear method is more suitable to the realtime fingerprint recognition system because of its efficiency.
关键词
相关扩散方程 /
指纹图像 /
图像增强 /
指纹识别 /
模式识别
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Key words
Coherent Diffusion /
Fingerprint Image /
Image Enhancement /
Fingerprint Recognition /
Pattern Recognition
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参考文献
[1] Jain A, Hong L, Bolle R. On-Line Fingerprint Verification. IEEE Trans on Pattern Analysis and Machine Intelligence, 1997, 19(4): 302-314
[2] Gu J W, Zhou J, Zhang D. A Combination Model for Orientation Field of Fingerprints. Pattern Recognition, 2004, 37(3): 543-553
[3] Hong L, Wan Y F, Jain A. Fingerprint Image Enhancement: Algorithm and Performance Evaluation. IEEE Trans on Pattern Analysis and Machine Intelligence, 1998, 20(8): 777-789
[4] Hsieh C T, Lai E, Wang Y C. An Effective Algorithm for Fingerprint Image Enhancement Based on Wavelet Transform. Pattern Recognition, 2003, 36(2): 303-312
[5] He Y L, Tian J, Luo X P, et al. Image Enhancement and Minutia Matching in Fingerprint Verification. Pattern Recognition Letter, 2003, 24(9/10): 1349-1360
[6] Cheng Jiangang, Tian Jie, He Yuliang, et al. Fingerprint Enhancement Algorithm Based on Nonlinear Diffusion Filter. Acta Automatica Sinica, 2004, 30(6): 854-862 (in Chinese)
(程建刚, 田 捷, 何余良, 等. 基于非线性扩散滤波的指纹增强算法. 自动化学报, 2004, 30(6): 854-862)
[7] Weickert J. A Review of Nonlinear Diffusion Filtering // Romeny B M H, Florack L, Koenderink J J, et al, eds. Lecture Notes in Computer Science. London, UK: Springer-Verlag, 1997, 1252: 3-28
[8] Weickert J. Multiscale Texture Enhancement // Proc of the 6th International Conference on Computer Analysis of Images and Patterns. Prague, Czech Republic, 1995: 230-237
[9] Weickert J, Scharr H. A Scheme for Coherence-Enhancing Diffusion Filtering with Optimized Rotation Invariance. Journal of Visual Communication and Image Representation, 2002, 13(1/2): 103-118
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