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Journal of Information Science and Engineering, Vol.19 No.4, pp.667-680 (July 2003)

Morphological De-ringing Filter Design for JEPG-2000

Shen-chuan Tai, Chuen-Ching Wang, Ling-Shiou Huang
and Ying-Ru Chen
Institute of Eelctrical Engineering
National Cheng Kung University
Tainan, 701 Taiwan

JPEG2000 plays an important role in image data compression. However, JPEG-2000 produces noticeable image degradation, so-called ringing artifacts, in the vicinities of edges in reconstructed images, especially when the images are highly compressed. Ringing artifacts result in artificial contours, thus so degrading the quality of decoded images. To improve the visual quality of decoded images and make them perceptually acceptable, post-processing to accomplish de-ringing is often used. In this paper, an adaptive directional morphological filter (ADMF) to reduce ringing artifacts is presented. Compared with the previously proposed methods, ADMF is rather efficient and effective. Simulation results show that ADMF is capable of significantly reducing ringing artifacts.

Keywords: JPEG2000, de-ringing filter, morphological filter, wavelet-based coding, ringing artifacts

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Received October 19, 2001; revised April 10 & June 24, 2002; accepted August 14, 2002.
Communicated by Kuo-Chin Fan.