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Proceedings Paper

Descreening of color halftone images in the frequency domain
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Paper Abstract

Scanning a halftone image introduces halftone artifacts, known as Moir´e patterns, which significantly degrade the image quality. Printers that use amplitude modulation (AM) screening for halftone printing position dots in a periodic pattern. Therefore, frequencies relating halftoning are easily identifiable in the frequency domain. This paper proposes a method for descreening scanned color halftone images using a custom band reject filter designed to isolate and remove only the frequencies related to halftoning while leaving image edges sharp without image segmentation or edge detection. To enable hardware acceleration, the image is processed in small overlapped windows. The windows are filtered individually in the frequency domain, then pieced back together in a method that does not show blocking artifacts.

Paper Details

Date Published: 25 January 2011
PDF: 7 pages
Proc. SPIE 7866, Color Imaging XVI: Displaying, Processing, Hardcopy, and Applications, 78661H (25 January 2011); doi: 10.1117/12.872158
Show Author Affiliations
C. J. Stanger, Boise State Univ. (United States)
Thanh Tran, Boise State Univ. (United States)
Elisa H. Barney Smith, Boise State Univ. (United States)

Published in SPIE Proceedings Vol. 7866:
Color Imaging XVI: Displaying, Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu; Alessandro Rizzi, Editor(s)

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