Tone-dependent error diffusion

Authors:
Pingshan Li;J. P. Allebach
Affiliations:
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA;-
Venue:
IEEE Transactions on Image Processing
Year:
2004

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Abstract

We present an enhanced error diffusion halftoning algorithm for which the filter weights and the quantizer thresholds vary depending on input pixel value. The weights and thresholds are optimized based on a human visual system model. Based on an analysis of the edge behavior, a tone dependent threshold is designed to reduce edge effects and start-up delay. We also propose an error diffusion system with parallel scan that uses variable weight locations to reduce worms.