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At low bit-rates, the conventional image coding standards, e.g., JPEG and JPEG 2000, do not have good compression performance due to the insufficiency of coding bits. A common solution to this problem is downsampling before encoding and reconstruction after decoding. Inspired by the wavelet domain downsampling-based compression scheme, we establish an enhanced low bit-rates coding framework by making...
The three-dimensional (3D) microscopic pore structure of Reservoir rock directly affects its seepage characteristics and physical properties. A 3D microscopic pore structure can be reconstructed from a single two-dimensional (2D) training image (TI) by using mathematical modeling methods. In this paper, we introduce the concepts of blocks, dictionary and learning into the reconstruction of 3D porous...
There is a major defect when using the traditional topic-opinion model for post opinion classifications in an online forum discussion. The accuracy of the classification based on the topic-opinion model highly depends on the observable topic-opinion features aiming at the subject, while a large number of posts do not have such features in a forum. Therefore, for the most part, the accuracy is less...
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