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Biometric sensor interoperability refers to the ability of a system to compensate for the variability introduced in the biometric data of an individual due to the deployment of different sensors. Poor inter-sensor performance has been reported in different biometric domains including fingerprint, face, iris and speech. In the context of fingerprints, variations are observed in the acquired images due to differences in sensor resolution, scanning area, sensing technology, etc. which impact the feature set extracted from these images. The inability of a fingerprint matcher to compensate for these variations introduced in fingerprints acquired using different sensors results in inferior inter-sensor performance. In this work it is demonstrated that a simple non-linear calibration scheme, based on Thin Plate Splines (TPS), is sufficient to facilitate sensor interoperability in the context of fingerprints. In the proposed technique, the variation between the images acquired using two different sensors is modeled using non-linear distortions. The proposed calibration model is tested on the MSU dataset comprising of fingerprint images obtained using two different sensor technologies: an optical Digital Biometrics (DBI) sensor and a solid-state capacitive VERIDICOM (VERI) sensor. Experiments indicate that the proposed calibration scheme improves the inter-sensor Genuine Accept Rate (GAR) by ~35% to ~40% at a False Accept Rate (FAR) of 0.01%.
security, authentication, government, sensor fusion, feature, representation, registration, geometric correction, imaging, geometry, camera calibration, splines

A. Ross and R. Nadgir, "A Thin-Plate Spline Calibration Model For Fingerprint Sensor Interoperability," in IEEE Transactions on Knowledge & Data Engineering, vol. 20, no. , pp. 1097-1110, 2007.
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