Title :
Edge behavior of error diffusion
Author :
Fan, Zhigang ; Li, Fu
Author_Institution :
Xerox Corp., Webster, NY, USA
Abstract :
Error diffusion is an important technique for digital halftoning. One of the most observable artifacts of error diffusion is the inherent edge enhancement. We analyze the edge behavior of error diffusion. We show that error diffusion does not always enhance edges. For some error diffusion weights, it actually blurs the images. We demonstrate that the source for edge enhancement or blurring is the nonuniform distribution of the correction terms. We propose an enhancement index to predict the overall edge behavior for a given set of weights
Keywords :
edge detection; image enhancement; prediction theory; quantisation (signal); sigma-delta modulation; artifacts; correction terms; digital halftoning; edge behavior; edge enhancement; enhancement index; error diffusion weights; image blurring; nonuniform distribution; quantizer errors; sigma-delta modulation; Delta-sigma modulation; Equations; Error analysis; Error correction; Image generation; Image quality; Noise shaping; Nonlinear filters; Quantization; Stochastic processes;
Conference_Titel :
Image Processing, 1995. Proceedings., International Conference on
Conference_Location :
Washington, DC
Print_ISBN :
0-8186-7310-9
DOI :
10.1109/ICIP.1995.537593
