Tae Ha Kang, Byong Won Hwang

The KIPS Transactions:PartB , Vol. 8, No. 3, pp. 319-326, Jun. 2001
10.3745/KIPSTB.2001.8.3.319,   PDF Download:

Abstract

The error diffusion technique for digital halftoning has good performance in reproducing binary image from contineous image. However the reproduction of edge characteristic is weak. Also binary image has undesirable periodic pattern that degenerate the perceived quality. In this paper, an edge enhanced error diffusion technique is proposed to improve the edge characteristic and adaptive threshold modulation method is suggested to degenerate undesirable periodic patterns. Spatial gradient information in original image is adapted for edge enhance in threshold modulation of error diffusion. And it used to decrease undesirable periodic pattern in adaptive threshold modulation with blue noise mask. In the experiment result of adaptive threshold modulation, we show that the proposed algorithm can degenerate undesirable periodic pattern and edge enhanced halftone image. The performance of the proposed algorithm is compared with that of the conventional edge enhanced error diffusion by measuring the edge correlation and the local average accordance over a range of viewing distances and the RAPSD of display error.

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