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|Title:||A POCS-based restoration algorithm for restoring halftoned color-quantized images|
Projection onto convex sets (POCS)
|Source:||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.|
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|Appears in Collections:||EIE Journal/Magazine Articles|
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