Descreening of Color Halftone Images in the Frequency Domain

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

doi:10.1117/12.872158

Descreening of Color Halftone Images in the Frequency Domain

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

Electrical Engineering Department

Boise State University

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Scanning a halftone image introduces halftone artifacts, known as Moiré 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.

Original language	American English
Journal	Electrical and Computer Engineering Faculty Publications and Presentations
DOIs	https://doi.org/10.1117/12.872158
State	Published - 24 Jan 2011

Keywords

descreening
fast Fourier transform
half toning

EGS Disciplines

Electrical and Computer Engineering

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Descreening of Color Halftone Images in the Frequency DomainFinal published version, 437 KBLicense: Unspecified

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title = "Descreening of Color Halftone Images in the Frequency Domain",

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.",

keywords = "descreening, fast Fourier transform, half toning",

author = "Stanger, {C. J.} and Thanh Tran and {Barney Smith}, {Elisa H.}",

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AU - Stanger, C. J.

AU - Tran, Thanh

AU - Barney Smith, Elisa H.

PY - 2011/1/24

Y1 - 2011/1/24

N2 - Scanning a halftone image introduces halftone artifacts, known as Moiré 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.

AB - Scanning a halftone image introduces halftone artifacts, known as Moiré 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.

KW - descreening

KW - fast Fourier transform

KW - half toning

UR - https://scholarworks.boisestate.edu/electrical_facpubs/95

U2 - 10.1117/12.872158

DO - 10.1117/12.872158

M3 - Article

JO - Electrical and Computer Engineering Faculty Publications and Presentations

JF - Electrical and Computer Engineering Faculty Publications and Presentations

ER -

Descreening of Color Halftone Images in the Frequency Domain

Abstract

Keywords

EGS Disciplines

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