Liu, Xiangdong2014-03-142014-03-141996-05-01etd-158151259631631http://hdl.handle.net/10919/30304In this dissertation we provide a comprehensive theory for the formation of a moire pattern in a sampled halftone image. We explore techniques for restoring a sampled halftone image with a moire pattern and techniques for preventing a moire pattern when a halftone picture is scanned. Specifically, we study the frequency, phase, and spatial geometry of a moire pattern. We observe and explain the half period phase reversal phenomenon that a moire pattern may exhibit. As a case study, we examine the moire patterns generated by a commercial scanner. We propose three restoration methods, including a notch filtering method, a simulation method, and a relaxation method. We also describe a moire prevention method, the partial inverse Fourier transform method. Finally, we propose a research agenda for further investigation.In Copyrightmoire patternshalftonescanningimage processingFourier analysisDissertationhttp://scholar.lib.vt.edu/theses/available/etd-158151259631631/