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The Mixed Raster Content (MRC) standard (ITU-T T.44) specifies a framework for document compression which can dramatically improve the compression/quality tradeoff as compared to traditional lossy image compression algorithms. The key to MRC's performance is the separation of the document into foreground and background layers, represented as a binary mask.(More)
—Multi-slice helical CT is widely used for baggage inspection in transportation security due to its fast acquisition speed and large scan coverage. In addition, recent studies indicate that model-based reconstruction has the potential to improve image quality and reduce artifacts relative to traditional filtered backprojection (FBP) method. In this paper,(More)
Computed Tomography (CT) is widely used for transportation security to screen baggage for potential threats. For example, many airports use X-ray CT to scan the checked baggage of airline passengers. The resulting reconstructions are then used for both automated and human detection of threats. Recently, there has been growing interest in the use of(More)
While Markov random field (MRF) models have been widely used in the solution of inverse problems, a major disadvantage of these models is the difficulty of parameter estimation. At its root, this parameter estimation problem stems from the inability to explicitly express the joint distribution of an MRF in terms of the conditional distributions of elements(More)
The mixed raster content (MRC) standard (ITU-T T.44) specifies a framework for document compression which can dramatically improve the compression/quality tradeoff as compared to traditional lossy image compression algorithms. The key to MRC compression is the separation of the document into foreground and background layers, represented as a binary mask.(More)
Bayesian model-based inversion has been applied to many applications, sueh as tomographic reconstructions. However, one limitation of these methods is that prior models are quite simple; so they are not capable of being trained to statistically represent subtle detail in images. In this paper, we demonstrate how novel prior modeling methods based on(More)
This is to certify that the thesis/dissertation prepared By Entitled For the degree of Is approved by the final examining committee: Chair To the best of my knowledge and as understood by the student in the Research Integrity and Copyright Disclaimer (Graduate School Form 20), this thesis/dissertation adheres to the provisions of Purdue University's "(More)
ii For my parents, Haruko and Hiromasa. iii ACKNOWLEDGMENTS First, I would like to express my greatest appreciation to my major advisor, Professor Charles A. Bouman, who has given me countless precious advice, encouragement, consideration, support, and discipline to train me. His creativity and enthusiasm toward research and education has been a great(More)
RNA-protein interactions play important roles in gene regulation, functional RNA-protein complexes such as the ribosome, and in viral replication. Molecules that regulate specific RNA-protein interactions may be used to dissect biological processes, and to establish the validity of targeting an RNA-protein interaction. There are many examples of biological(More)
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