Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........67k&link_type=abstract
Thesis (PH.D.)--BOSTON UNIVERSITY, 1992.Source: Dissertation Abstracts International, Volume: 52-05, Section: B, page: 2660.
Other
1
Image Reconstruction
Scientific paper
A new set of parametric wavelets called Hermite -Rodriguez wavelets, and a new family of highly singular functions called hyperdistributions are introduced. Their introduction is motivated by the search for a consistent solution to the inverse problem in signals and systems analysis: the evaluation of the initial condition--or input --to a system, given its final condition--or output--and its impulse response. I construct a novel mathematical framework for the search for a solution to the inverse problem, and apply it to a practical case: the inverse problem for blurring systems. Blurring systems are very common: they include telescopes and other optical systems, as well as satellite telecommunications, where the waveforms that transmit the relevant information have to travel long distances, and are partly scattered by molecules and ions in their path from the source to the observer. As a result, the waveforms that reach the observer are blurred. The goal is to recover the original waveforms. The mathematical equivalent for the solution to the inverse problem for blurring systems is given. It consists in solving the antidiffusion equation, which is equivalent to solving the diffusion equation backwards in time, to determine the initial condition of the diffusive process, given the final condition. I apply this solution of the inverse problem to two practical cases: the reconstruction of blurred signals, and of blurred simulated astronomical images. ftn*All degree requirements completed in 1991, but degree will be granted in 1992.
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