Browsing by Author "De Kock, Antonie Johannes"

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    The study of similarity score calculation methods for minutia-based fingerprint matching algorithms
    (Stellenbosch : Stellenbosch University, 2016-11) De Kock, Antonie Johannes; Coetzer, Johannes; Mathekga, Mmamolatelo E.; Stellenbosch University. Faculty of Science. Dept. of Mathematical Sciences (Applied Mathematic)
    ENGLISH ABSTRACT : This study aims to establish guidelines for calculating the similarity score between two minutia point representations of ngerprints for minutia-based ngerprint matching. Existing research does not provide clear guidelines on how to calculate the similarity score between two minutia point representations and the reported performance of most existing algorithms include those comparisons for which the point matching algorithm failed. This study therefore compares the performance of existing similarity score calculation methods after the erroneous comparisons from the point matching algorithm have been removed. It furthermore investigates in which way and to what extent these methods are a ected by intra-class variations and inter-class similarities. The results indicate that none of the existing similarity score calculation methods is superior to all the others when implemented on the FVC2002 and FVC2004 ngerprint databases. This study also proposes an improved local descriptor for local similarity score calculation and investigates whether the combination of di erent types of similarity score calculation methods better addresses intraclass variations and inter-class similarities and therefore improves pro ciency. The results indicate that similarity score calculation methods that address both global and local inter-class similarities, and are robust to intra-class variations, perform better across multiple databases. Even though this study concludes that the combination of di erent types of similarity score calculation methods generally improves pro ciency, high levels of noise and nonlinear distortion still adversely a ect performance. Future work should therefore focus on improving the stages preceding the similarity score calculation stage, i.e. minutia extraction and point matching.