Browsing by Author "Ohi, Abu Quwsar"

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    Open-set Speaker Recognition with Bounded Laguerre Voronoi Clustering
    (2024-08-19) Ohi, Abu Quwsar; Gavrilova, Marina L; Sousa, Mario Costa; Bezdek, Karoly
    Speaker recognition is a challenging problem in behavioral biometrics. It has been rigorously investigated over the last decade. Although numerous supervised closed-set systems successfully harvest the power of deep neural networks, limited studies have been made on open-set speaker recognition. This thesis proposes a self-supervised open-set speaker recognition that leverages the geometric properties of speaker distribution for accurate and robust speaker identification. The proposed framework consists of a deep neural network incorporating a wider viewpoint of temporal speech features and Laguerre–Voronoi diagram-based speech feature extraction. The deep neural network is trained with a specialized clustering criterion that only requires positive pairs during training. The framework further incorporates a novel approach of clustering by integrating concepts from Voronoi diagrams in Laguerre geometry. This approach offers flexibility by necessitating only one hyperparameter, an upper-bound value for the number of centroids. The experiments validated that the proposed system outperformed current state-of-the-art methods in open-set speaker verification and identification.