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Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/1486

Title: A POCS-based restoration algorithm for restoring halftoned color-quantized images
Authors: Fung, Yik-hing
Chan, Yuk-hee
Subjects: Color palette
Color restoration
Color quantization
Error diffusion
Image restoration
Inverse halftoning
Projection onto convex sets (POCS)
Issue Date: Jul-2006
Publisher: IEEE
Citation: IEEE transactions on image processing, July 2006, v. 15, no. 7, p. 1985-1992.
Abstract: This paper studies the restoration of images which are color-quantized with error diffusion. Though there are many reported algorithms proposed for restoring noisy blurred color images and inverse halftoning, restoration of color-quantized images is rarely addressed in the literature especially when the images are color-quantized with halftoning. Direct application of existing restoration techniques are generally inadequate to deal with this problem. In this paper, a restoration algorithm based on projection onto convex sets is proposed. This algorithm makes use of the available color palette and the mechanism of a halftoning process to derive useful a priori information for restoration. Simulation results showed that it could improve the quality of a halftoned color-quantized image remarkably in terms of both SNR and CIELAB color difference metric.
Rights: © 2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/1486
ISSN: 1057-7149
Appears in Collections:EIE Journal/Magazine Articles

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