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A Deblocking Algorithm Using Anisotropic Diffusion for Block DCT-based Compressed Images  

Choi, Euncheol (EOSystem Co. Ltd, Dept. of Electrical and Electronic Engineering, Yonsei University)
Han, Youngseok (Dept. of Electrical and Electronic Engineering, Yonsei University)
Park, Min Kyu (Dept. of Electrical and Electronic Engineering, Yonsei University)
Kang, Moon Gi (Dept. of Electrical and Electronic Engineering, Yonsei University)
Publication Information
Journal of Broadcast Engineering / v.10, no.3, 2005 , pp. 383-391 More about this Journal
Abstract
In this paper, a new anisotropic diffusion based on Alvarez, Lions, and Morel (ALM) diffusion model is proposed for the suppression of blocking artifact caused by discrete cosine transform (DCT) based image compression. The proposed diffusion model, which incorporates a 'rate control parameter' (RCP), makes it possible to reduce blocking artifacts while to preserve the edge. The RCP controls the rate between isotropic and anisotropic diffusion. Isotropic diffusion is encouraged to eliminate the blocking artifacts in a block boundary of a smooth region, while anisotropic diffusion is encouraged to keep the edge or texture sharp in edge and a block boundary within an edge region. Additionally, to avoid oversmoothness of the texture region, a 'speed control parameter' (SCP), which makes diffusion process slow in the texture region, is employed.
Keywords
Terms Image compression; discrete cosine transform(DCT); blocking artifacts; anisotropic diffusion.;
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