NDLI: Edge-Enhanced Error Diffusion Halftoning using Human Visual Properties

Content Provider	IEEE Xplore Digital Library
Author	Nae-Joung Kwak Soung-Pil Ryu Jae-Hyeong Ahn
Copyright Year	2006
Description	Author affiliation: Dept. of Inf. Commun. Eng., Mokwon Univ. (Nae-Joung Kwak)
Abstract	Digital halftoning is the technique to obtain a bilevel-toned image from continuous-toned image. Among halftoning methods, the error diffusion method gives better subjective quality than other halftoning ones. But it also makes edges of objects blurred. To overcome the defect, we proposes the modified error diffusion to enhance the edges using the property that human vision perceives the local average luminance and doesn't perceive a little variation of the spatial information. The proposed method computes a local activity measure, which is the difference between a pixel luminance and the average of its 3times3 neighborhood pixels' luminance weighted according to the spatial positioning. The system also uses information of edge enhancement (IEE), which is computed from the normalized spatial activity measure multiplied by the average luminance. The IEE is added to the quantizer's input pixel and feeds into the halftoning quantizer. The quantizer produces the halftone image having the enhanced edge. The computer experimental results show that the proposed method produces clearer bilevel-toned images than conventional methods and the edge of objects is preserved well. Also the performance of the proposed method is improved, compared with that of the conventional method by measuring the edge correlation and the local average accordance at some ranges of viewing distance
Sponsorship	IEEE Comput. Soc
Starting Page	499
Ending Page	504
File Size	406002
Page Count	6
File Format	PDF
ISBN	0769526748
DOI	10.1109/ICHIT.2006.253533
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-11-09
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Humans Adaptive filters Position measurement Plasma measurements Plasma displays Information filtering Local activities Feeds Printers Pixel
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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