Projection-based spatially adaptive reconstruction of block transform compressed images

Yongyi Yang; Nikolas P. Galatsanos; Aggelos K. Katsaggelos

doi:10.1117/12.185906

16 September 1994 Projection-based spatially adaptive reconstruction of block transform compressed images

Yongyi Yang, Nikolas P. Galatsanos, Aggelos K. Katsaggelos

Author Affiliations +

Proceedings Volume 2308, Visual Communications and Image Processing '94; (1994) https://doi.org/10.1117/12.185906
Event: Visual Communications and Image Processing '94, 1994, Chicago, IL, United States

Abstract

In conventional block-transform coding, the compressed images are decoded using only the transmitted transform data. In this paper, we formulate image decoding as an image recovery problem. According to this approach, the decoded image is reconstructed using not only the transmitted data, but in addition, the prior knowledge that images before compression do not display blocking artifacts. A spatially-adaptive image recovery algorithm is proposed based on the theory of projections onto convex sets. Numerical experiments demonstrate that the proposed algorithm yields images superior to those from both the JPEG deblocking recommendation and a projection-based image decoding approach.

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Yongyi Yang, Nikolas P. Galatsanos, and Aggelos K. Katsaggelos "Projection-based spatially adaptive reconstruction of block transform compressed images", Proc. SPIE 2308, Visual Communications and Image Processing '94, (16 September 1994); https://doi.org/10.1117/12.185906

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