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Reduction of Artifacts in Cosine Transform Coded Images

Zou, J.J. and Yan, H.

    A method for reducing blocking artifacts in compressed images coded by the block discrete cosine transform (BDCT) is presented. Problems arising from the independent transform and quantization of individual blocks result in blocking artifacts. This study is aimed at reducing the blocking artifacts while avoiding excessively blurring the underlying image. The theory of projection onto convex sets (POCS) is applied. An image before compression is simulated by a locally adaptive triangular mesh. The mesh forms the basis of a smoothness constraint set. To construct such a mesh, each image block is divided into a set of triangles. The number of triangles in a block is determined by the intensity variation of the block. Experimental results show that the proposed method outperforms two competing methods.
Cite as: Zou, J.J. and Yan, H. (2002). Reduction of Artifacts in Cosine Transform Coded Images. In Proc. Selected papers from 2001 Pan-Sydney Area Workshop on Visual Information Processing (VIP2001), Sydney, Australia. CRPIT, 11. Feng, D. D., Jin, J., Eades, P. and Yan, H., Eds. ACS. 35-38.
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