Graduate Studies
First Advisor
Benjamin S. Riggan
Degree Name
Doctor of Philosophy (Ph.D.)
Committee Members
Arman Roohi, Mohammad Rashedul Hasan, Hasan Otu, Michael Hoffman
Department
Electrical Engineering
Date of this Version
3-2024
Document Type
Dissertation
Citation
A dissertation presented to the faculty of the Graduate College at the University of Nebraska in partial Fulfillment of requirements for the degree of Doctor of Philosophy
Major: Electrical Engineering
Under the supervision of Professor Benjamin S. Riggan
Lincoln, Nebraska, March 2024
Abstract
While supervised optimization paradigms are ubiquitous across diverse recognition systems, the risk of over-fitting and increasing bias have limited their applicability.
This dissertation focuses on unsupervised learning—learning without precisely curated data—and argues that unsupervised learning methods can enable both discriminability and generalizability. Through the use of attention-based machine learning and advanced clustering, unsupervised methods are able to focus on fine-grained information in images without any explicit supervision. The dissertation introduces a domain-bridging framework for tasks like cross-spectrum matching and long-range recognition, utilizing intra-domain clustering and inter-domain matching to generate pseudo-labels. Additionally, a hash-based network is proposed to accelerate the search process, with dynamic capabilities for computational adjustment based on operational demands or input complexity.
The overall framework is demonstrated over biometric tasks, such as person re-identification and facial recognition, and shows superiority in performance and efficiency compared to other unsupervised methods, and in some cases even supervised methods.
Advisor: Benjamin S. Riggan
Recommended Citation
Nikhal, Kshitij Naresh, "Weakly Supervised Attention-based Recognition under Spectral, Turbulence, and Resource Variations" (2024). Dissertations and Doctoral Documents from University of Nebraska-Lincoln, 2023–. 56.
https://digitalcommons.unl.edu/dissunl/56
Included in
Computational Engineering Commons, Computer Engineering Commons, Numerical Analysis and Scientific Computing Commons
Comments
Copyright 2024, Kshitij Naresh Nikhal. Used by permission