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

ASIA unversity > 資訊學院 > 資訊傳播學系 > 期刊論文 > Item 310904400/4376

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題名:	Suppression of Moir� patterns in scanned halftone images by double scans with grid movements
作者:	J. C. Y. Yang;W. H. Tsai
貢獻者:	Department of Information Communication
關鍵詞:	Moir� pattern;Suppression;Scanning;Printing;Screened pictures;Fourier analysis
日期:	1997-03
上傳時間:	2009-11-25 02:31:06 (UTC+0)
出版者:	Asia University
摘要:	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.
關聯:	Pattern Recognition Letters 18 (3): 213-227
顯示於類別:	[資訊傳播學系] 期刊論文

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