EURASIP Journal on Applied Signal Processing 
Volume 2004 (2004), Issue 4, Pages 495-502
doi:10.1155/S1110865704310103

Ridge Distance Estimation in Fingerprint Images: Algorithm and Performance Evaluation

Yilong Yin,1 Jie Tian,2 and Xiukun Yang3

 1College of Computer Science & Technology, Shandong University, Shanda South Road 27, Jinan 250100, China
2Intelligent Bioinformatics Systems Division, Institute of Automation, The Chinese Academy of Sciences, Beijing 100080, China
3Identix Inc, One Exchange Place Suite 800, Jersey City 07302, NJ, USA
Received 17 October 2002; Revised 27 September 2003

Abstract

It is important to estimate the ridge distance accurately, an intrinsic texture property of a fingerprint image. Up to now, only several articles have touched directly upon ridge distance estimation. Little has been published providing detailed evaluation of methods for ridge distance estimation, in particular, the traditional spectral analysis method applied in the frequency field. In this paper, a novel method on nonoverlap blocks, called the statistical method, is presented to estimate the ridge distance. Direct estimation ratio (DER) and estimation accuracy (EA) are defined and used as parameters along with time consumption (TC) to evaluate performance of these two methods for ridge distance estimation. Based on comparison of performances of these two methods, a third hybrid method is developed to combine the merits of both methods. Experimental results indicate that DER is 44.7%, 63.8%, and 80.6%; EA is 84%, 93%, and 91%; and TC is 0.42, 0.31, and 0.34 seconds, with the spectral analysis method, statistical method, and hybrid method, respectively.