In this paper, we describe the method of random-function based combination of algorithm to improve the quality of
variable-coefficient error-diffusion. To remove the visual artifacts, we propose a variable-direction E-D algorithm which
can generate none artifact images on the intensity of V-C-E-D's artifacts area. Using random-function and a set of
thresholds to control the selection of the algorithm. Experiments were done on the critical level to get the optimal
thresholds. The result of the algorithm combination is an artifact-free halftoning in the full range of intensities. Artifacts
of V-C-E-D and V-D-E-D are all removed. Fourier spectra analysis of the selected key density further supports this
conclusion.
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