Descreening of color halftone images in the frequency domain

C. J. Stanger; Thanh Tran; Elisa H. Barney Smith

doi:10.1117/12.872158

25 January 2011 Descreening of color halftone images in the frequency domain

C. J. Stanger, Thanh Tran, Elisa H. Barney Smith

Proceedings Volume 7866, Color Imaging XVI: Displaying, Processing, Hardcopy, and Applications; 78661H (2011) https://doi.org/10.1117/12.872158
Event: IS&T/SPIE Electronic Imaging, 2011, San Francisco Airport, California, United States

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.

Citation Download Citation

C. J. Stanger, Thanh Tran, and Elisa H. Barney Smith "Descreening of color halftone images in the frequency domain", Proc. SPIE 7866, Color Imaging XVI: Displaying, Processing, Hardcopy, and Applications, 78661H (25 January 2011); https://doi.org/10.1117/12.872158

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