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In this paper, a directional adaptive loop filter is proposed for video coding. It classifies the pixels of a reconstructed frame into multiple categories based on the local directional characteristics. A Wiener filter is estimated for each category by minimizing the average mean square error between the original and reconstructed pixels in that category. The filter supports are carefully designed...
In all video coding standards, motion vectors are restricted to have the same resolution for the whole sequence. In this paper, we propose an adaptive motion vector resolution scheme to improve the coding efficiency. The scheme is based on an analytical model of motion compensated residue which studies the relationship between motion vector errors and the variance of the residue. With this model,...
Geometry-adaptive block partitioning (GEO) can greatly enhance video coding efficiency but at the expense of significantly increased computational complexity. Instead of proposing fast searching algorithm for encoding only, this paper proposes to reduce the size of partitions for both the encoder and the decoder. The proposed scheme only searches partitions recognized as most valuable partitions,...
Current gene-expression microarrays carry an enormous amount of information. This paper examines lossy SPIHT and JPEG 2000 compression of oligo microarray images and addresses the accuracy of differential expression detection with compressed images. Experiments show that the identification disagreement rate for all genes monotonically increases with the compression ratio, but is still under 1.5% at...
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