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The goal is to develop and evaluate a new constrained feature-based cardiac motion estimation (ME) method for cardiac gated (CG) myocardial perfusion (MP) PET images to improve the accuracy of the estimated cardiac motion vector field (MVF). CG-MP PET projection data were generated from the 4D XCAT phantom with realistic anatomical structures and cardiac MVF models, and reconstructed using the STIR...
Behavioral biometrics have recently begun to gain attention for mobile user authentication. The feasibility of touch gestures as a novel modality for behavioral biometrics has been investigated. In this paper, we propose applying a statistical touch dynamics image (aka statistical feature model) trained from graphic touch gesture features to retain discriminative power for user authentication while...
Accurate estimation of cardiac motion from clinical medical images especially motion components parallel to edges has been found to be difficult using the intensity based optical flow algorithm without any prior information. This research aims to develop a new feature guided cardiac motion estimation method for gated myocardial perfusion (MP) PET images whose quality has greatly improved in recent...
Behavioral biometric on mobile devices has begun to gain attention in recent years and the feasibility of touch gestures as a novel biometric modality has been investigated lately. In this paper, we propose a novel Graphic Touch Gesture Feature (GTGF) to extract the identity traits from the touch traces. The traces' movement and pressure dynamics are represented by intensity values and shapes of the...
Employing mobile sensor data to recognize user behavioral activities has been well studied in recent years. However, exploiting mobile motion data as a novel biometric modality remains a new area. In this paper, we propose two novel methods, a Statistic Method to intuitively apply classifier on the statistic features of the data; and a Trajectory Reconstruction Method to reconstruct the Mobile Device...
Securing the sensitive data stored and accessed from mobile devices makes user authentication a problem of paramount importance. The tension between security and usability renders however the task of user authentication on mobile devices a challenging task. This paper introduces FAST (Fingergestures Authentication System using Touchscreen), a novel touchscreen based authentication approach on mobile...
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