Suppression of Moir� patterns in scanned halftone images by double scans with grid movements

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Title:	Suppression of Moir� patterns in scanned halftone images by double scans with grid movements
Authors:	J. C. Y. Yang;W. H. Tsai
Contributors:	Department of Information Communication
Keywords:	Moir� pattern;Suppression;Scanning;Printing;Screened pictures;Fourier analysis
Date:	1997-03
Issue Date:	2009-11-25 02:31:06 (UTC+0)
Publisher:	Asia University
Abstract:	Moir� patterns often appear in images obtained from scanning printings on magazines or newspapers. The patterns do not exist in the original printings but come from alias sampling of the screened halftone pictures. A new method of scanning is proposed to suppress the moir� patterns. First, the Fourier analyses of both screening and scanning are presented, from which the new moir� suppression scanning method is derived. The method employs a double-scan process. In the second scan, the scan position is shifted by half of the sampling grid distance of the first scan in either or both of the horizontal and vertical directions. Then by averaging the images of the two scans, most of the moir� fringes can be removed. Some experimental results are shown to demonstrate the feasibility of the proposed approach.
Relation:	Pattern Recognition Letters 18 (3): 213-227
Appears in Collections:	[Department of Information Communication] Journal Article

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