Resumo

HASIMOTO-BELTRA N, Rogelio  e  KHOKHAR, Ashfaq A. Spatial Error Concealment Based on Bezier Curves. Comp. y Sist. [online]. 2006, vol.9, n.3, pp.256-269. ISSN 2007-9737.

We present a geometric error concealment scheme for Discrete Cosine Transform (DCT) based image/video data based on the Bezier Curves (BC). Our scheme unlike the original proposal of Zeng and Liu, 1999, makes use of the average edge direction and local curvature (extracted from healthy blocks around the damaged block) as boundary conditions to create an n-degree BC. The BC is then used to interpolate the edge of the lost block (8x8 pixels), as well as to directionally reconstruct its low frequency data. In those cases where more than one edge is found to cross the lost area, a cost function defined in terms of the local and global edge curvature is used to find their best match. Results show that our approach provides an almost perfect reconstruction and excellent subjective quality of the restored data, outperforming current linear interpolations schemes in the literature.

Palavras-chave : Error Concealment; DCT-based compression; Bezier Curves.

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