MPEG postprocessing system using edge signal variable filter

Authors:
Chan-Ho Han;Suk-Hwan Lee;Seong-Geun Kwon;Ki-Ryong Kwon;Dong Kyue Kim
Affiliations:
School of Electrical Engineering & Computer Science, Kyungpook National University;Dept. of Information Security, TongMyong University;Mobile Communication Division, SAMSUNG electronics co.;Division of Electronic, Computer & Telecommunication Eng., Pukyong National Univ.;Dept. of Electronics and Computer Engineering, Hanyang University
Venue:
ICIAR'06 Proceedings of the Third international conference on Image Analysis and Recognition - Volume Part I
Year:
2006

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Abstract

We proposed the algorithm for the quantization noise reduction based on variable filter adaptive to edge signal in MPEG postprocessing system. In our algorithm, edge map and local modulus maxima in the decoded images are obtained by using 2D Mallat wavelet filter. And then, blocking artifacts in inter-block are reduced by Gaussian LPF that is variable to filtering region according to edge map. Ringing artifacts in intra-block are reduced by 2D SAF according to local modulus maxima. Experimental results show that the proposed algorithm was superior to the conventional algorithms as regards PSNR, which was improved by 0.04-0.20 dB, and the subjective image quality.