Restoration of Halftoned Color-Quantized Images Using Projection Onto Convex Sets (MA-P3)

Author(s) : Yik-Hing Fung (The Hong Kong Polytechnic University, Hong Kong) Yuk-Hee Chan (The Hong Kong Polytechnic University, Hong Kong)

Abstract : Restoration of color-quantized images is rarely addressed in the literature especially when the images are color-quantized with halftoning. Direct applications of existing restoration techniques are generally inadequate to deal with this problem. In this paper, we propose a POCS-based restoration algorithm to solve the problem. This algorithm makes a good use of the available color palette and the mechanism of a halftoning process to derive useful a priori information for restoration. It is shown to be able to provide a good restoration result.

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