A study on the performance of multiscale error diffusion algorithms

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A study on the performance of multiscale error diffusion algorithms


Author: Yu, Ka-wah Neil Bryant
Title: A study on the performance of multiscale error diffusion algorithms
Degree: M.Sc.
Year: 2006
Subject: Hong Kong Polytechnic University -- Dissertations
Photoengraving -- Halftone process -- Mathematical models.
Printing -- Technique -- Mathematical models
Image processing -- Digital techniques
Department: Dept. of Electronic and Information Engineering
Pages: viii, 80 leaves : ill. (some col.) ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b1958055
URI: http://theses.lib.polyu.edu.hk/handle/200/5487
Abstract: Halftoning is a process of converting a continuous-tone image into bi-level image. Error Diffusion has been used to serve the purpose for years. However, due to the raster scanning nature of the diffusion process, visual artifacts exist in the output image. Modifications to error diffusion have been proposed and Multiscale Error Diffusion is one of the modifications. Multiscale Error Diffusion (MED) was first proposed in 1997 by Katsavounidis and C.C.J. Kuo and improved in 1998 and 2004. By subjective inspection, it is superior to the conventional error diffusion algorithms as pattern noise and directional hysteresis are removed in its outputs. However, so far there has been no detailed analytical evaluation reported to show the performance difference between them. The goal of this dissertation is to present the results of our study on the performance of different MED algorithms.

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