An analytical approach is proposed to explain the appearance of unwanted low frequency artifacts during the random dithering halftoning process. The solution uses a theorem which relates the correlation of the input gray level (continuous) signal to the correlation of the output (halftone) binary signal. The numerical solution of the above relationship suggests that: 1. Introduction of low frequency artifacts is inevitable. 2. The effect is enhanced for mean gray levels farther from mid-gray. 3. High frequency information in the input signal is attenuated more than low frequency information.
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Department, Program, or Center
Chester F. Carlson Center for Imaging Science (COS)
Steinberg, Eran, "Analysis of random halftone dithering using second order statistics" (1991). Thesis. Rochester Institute of Technology. Accessed from
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