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.
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