The Visibility Of Moire' Patterns

Joseph Shou-Pyng Shu; Robert Springer; Chia Lung Yeh

doi:10.1117/12.968992

25 October 1988 The Visibility Of Moire' Patterns

Joseph Shou-Pyng Shu, Robert Springer, Chia Lung Yeh

Proceedings Volume 1001, Visual Communications and Image Processing '88: Third in a Series; (1988) https://doi.org/10.1117/12.968992
Event: Visual Communications and Image Processing III, 1988, Cambridge, MA, United States

Abstract

Unacceptable Moire' distortion may result when images that include periodic structures such as halftone dots are scanned. In the frequency domain, Moire' patterns are the result of visible aliased frequencies. In the spatial domain, the aliased frequency components correspond to cyclic changes in the size of halftone dots which are visible as periodic "beat" patterns. Moire' formation depends on the following factors: (1) halftone screen frequency, (2) scan frequency, (3) angle between the scan direction and the halftone screen, (4) the scanner aperture size and shape, (5) quantization errors from the thresholding operation, (6) scanner and printer noise, and (7) ink flow on paper during printing. This paper analyzes the visibility of Moire' patterns in terms of these factors. Moreover, the paper describes an approach to reduce the visibility of Moire' patterns by manipulating the Moire' formation factors directly rather than by post-scan processing. Computer simulated, and actual scan images are presented to illustrate the approach.

Citation Download Citation

Joseph Shou-Pyng Shu, Robert Springer, and Chia Lung Yeh "The Visibility Of Moire' Patterns", Proc. SPIE 1001, Visual Communications and Image Processing '88: Third in a Series, (25 October 1988); https://doi.org/10.1117/12.968992

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KEYWORDS

Moire patterns

Visibility

Halftones

Linear filtering

Scanners

Printing

Image filtering

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