Adaptive methods for dithering color images

Date
1997-07
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Source Title
IEEE Transactions on Image Processing
Print ISSN
1057-7149
Electronic ISSN
Publisher
Institute of Electrical and Electronics Engineers
Volume
6
Issue
7
Pages
950 - 955
Language
English
Type
Article
Journal Title
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Abstract

Most color image printing and display devices do not have the capability of reproducing true color images. A common remedy is the use of dithering techniques that take advantage of the lower sensitivity of the eye to spatial resolution and exchange higher color resolution with lower spatial resolution. In this paper, an adaptive error diffusion method for color images is presented. The error diffusion filter coefficients are updated by a normalized least mean square-type (LMS-type) algorithm to prevent textural contours, color impulses, and color shifts, which are among the most common side effects of the standard dithering algorithms. Another novelty of the new method is its vector character: Previous applications of error diffusion have treated the individual color components of an image separately. Here, we develop a general vector approach and demonstrate through simulation studies that superior results are achieved.

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Keywords
Adaptive algorithms, Adaptive filtering, Color printing, Computer simulation, Image quality, Least squares approximations, Optical resolving power, Vectors, Color impulses, Color shifts, Textural contours, Vector error diffusion, Color image processing
Citation
Published Version (Please cite this version)