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Proceedings Paper

Color inverse halftoning method for scanned color images
Author(s): Jong-Min Kim; Jiyun Byun; Minhwan Kim
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Paper Abstract

A new color inverse halftoning method that converts a scanned color image, halftoned by the clustered-dot ordered dither, into a more natural continuous-tone image, is proposed by analyzing the Fourier spectrum of color image. A color channel separated from the color image makes three kinds of peaks in its Fourier spectrum: a channel peak, an interference peak, and a moire peak. The channel peak is formed by the repeated pattern of the channel halftone cells in the color channel, whereas the interference peak is made by the other channel halftone cells, due to imperfect separation of the color channel. The moire peak is the secondary peak formed by the interaction of the channel peak with the interference peak. A new smoothing mask for each color channel was designed to effectively remove not only the channel peak but also the interference peak, thereby making a smoother continuous-tone image. A block based moire extraction algorithm has also been developed to remove the moire peak adaptively, which can smooth the moire region in the color channel without blurring the other regions. Experiments show that the proposed method outperforms all the published results from other color inverse halftoning methods.

Paper Details

Date Published: 21 December 1999
PDF: 10 pages
Proc. SPIE 3963, Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts V, (21 December 1999); doi: 10.1117/12.373402
Show Author Affiliations
Jong-Min Kim, Kosin Univ. (South Korea)
Jiyun Byun, Pusan National Univ. (South Korea)
Minhwan Kim, Pusan National Univ. (South Korea)

Published in SPIE Proceedings Vol. 3963:
Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts V
Reiner Eschbach; Gabriel G. Marcu, Editor(s)

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