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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