Properties of Improved Dot Diffusion for Image Halftoning

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The dot diffusion method for digital halftoning has the advantage of parallelism unlike the error diffusion method. The method was improved by optimization of the so-called class matrix so that the resulting halftones are comparable to the error diffused halftones. First, 8 × 8 class matrices were used for dot diffusion method. However, there is a problem with this size of class matrix: enhancement of images is necessary before halftoning. It was found later that if the size of the class matrix was increased to 16 × 16, then there is no need for the enhancement step. In this article, we will review the dot diffusion. This will be followed by a discussion on special cases of dot diffusion. Then, we will show how the optimization is done to get the class matrices.

Document Type: Research Article

Publication date: May 1, 2001

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.
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