2006 | OriginalPaper | Buchkapitel
Improved POCS-Based Deblocking Technique Using Wavelet Transform in Block Coded Image
verfasst von : Goo-Rak Kwon, Hyo-Kak Kim, Chun-Soo Park, Yoon Kim, Sung-Jea Ko
Erschienen in: Advances in Multimedia Information Processing - PCM 2006
Verlag: Springer Berlin Heidelberg
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This paper presents a improved POCS-based deblocking technique, based on the theory of the projection onto convex sets (POCS) to reduce the blocking artifacts in decoded images. We propose a new smoothness constraint set (SCS) and its projection operator in the wave-let transform (WT) domain to remove unnecessary high-frequency components caused by blocking artifacts. In order to eliminate the blocking artifacts component while preserving the original edge component, we also propose a significant coefficient decision method (SCDM)for fast and efficient performance. Experimental results show that the proposed method can not only achieve a significantly enhanced subjective quality but also increase the PSNR improvement in the reconstructed image.