Symmetric edge enhancement in error diffusion

Keith T. Knox

doi:10.1117/12.373435

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21 December 1999 Symmetric edge enhancement in error diffusion

Keith T. Knox

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Proceedings Volume 3963, Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts V; (1999) https://doi.org/10.1117/12.373435
Event: Electronic Imaging, 2000, San Jose, CA, United States

Abstract

A method has been developed to induce symmetric edge enhancement in error diffusion with threshold modulation. The existing threshold modulation algorithm induces edge enhancement by subtracting a term proportional to the input image from the threshold. The edge enhancement that results in asymmetric due to the asymmetric shape of the error diffusion filter. The new method induces a symmetric edge enhancement by subtracting a term from the threshold that is proportional to a filtered version of the input image. The filtering is accomplished with a recursive filter, applied during the error diffusion algorithm, which cancels out the error diffusion filter and imposes a symmetric sharpening filter. The result is a symmetric edge enhancement that is more pleasing to the eye.

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Keith T. Knox "Symmetric edge enhancement in error diffusion", Proc. SPIE 3963, Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts V, (21 December 1999); https://doi.org/10.1117/12.373435

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