Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Lost Block Recovery Using Energy Ratio

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  • Hyun, Seung-Hwa (Department of Electronics Engineering Pusan National University) ;
  • Eom, Il-Kyu (Department of Electronics Engineering Pusan National University) ;
  • Kim, Yoo-Shin (Department of Electronics Engineering Pusan National University)
  • 현승화 (부산대학교 공과대학 전자공학과) ;
  • 엄일규 (부산대학교 공과대학 전자공학과) ;
  • 김유신 (부산대학교 공과대학 전자공학과)
  • Published : 2006.06.21
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Abstract

This paper presents a recovery technique for images with block-based corruption by transmission losses. Conventional methods that do not consider edge directions can cause blocked blurring artifacts. In this paper, we present a block recovery scheme using Haar wavelet features. The adaptive selection of neighboring blocks is performed based on the energy ratio f wavelet subbands. The lost blocks are recovered by linear interpolation in the spatial domain using selected block pairs. The proposed directional recovery method is effective for the strong edge because it exploits the varying neighboring blocks adaptively according to the edges and the directional information in the image. The proposed method outperforms the previous methods that used only a predefined set of neighboring blocks.

Keywords