A POCS-based restoration algorithm for restoring halftoned color-quantized images

作者：Fung YH^*; Chan YH

来源：IEEE Transactions on Image Processing, 2006, 15(7): 1985-1992.

DOI：10.1109/TIP.2006.873432

• color palette
• color restoration
• color quantization
• error diffusion
• image restoration
• inverse halftoning
• projection onto convex sets (POCS)

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.

• 出版日期2006-7
• 单位香港理工大学