Title page for ETD etd-158151259631631


Type of Document Dissertation
Author Liu, Xiangdong
URN etd-158151259631631
Title Analysis and Reduction of Moire Patterns in Scanned Halftone Pictures
Degree PhD
Department Computer Science
Advisory Committee
Advisor Name Title
Abbott, A. Lynn
Campbell, James B. Jr.
Heath, Lenwood S.
Shaffer, Clifford A.
Ehrich, Roger W. Committee Chair
Keywords
  • moire patterns
  • halftone
  • scanning
  • image processing
  • fourier analysis
Date of Defense 1996-05-01
Availability unrestricted
Abstract
In 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.

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