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We present a new efficient edge-preserving filter—“tree filter”—to achieve strong image smoothing. The proposed filter can smooth out high-contrast details while preserving major edges, which is not achievable for bilateral-filter-like techniques. Tree filter is a weighted-average filter, whose kernel is derived by viewing pixel affinity in a probabilistic framework simultaneously considering pixel...
The classic user-based collaborative filtering algorithm has some shortcomes in its similarity calculation. In this paper, we propose a statistic based collaborative filtering algorithm (SOFA). The contributions are three-fold: 1) a threshold is used to filter those inaccurate similarities between users who have less intersection, 2) users' statistics, such as mean, and variance, are used for similarity...
Earthquake is recognized as a great a natural disaster to mankind. The data released by Ministry of Civil Affairs is shown earthquakes had caused tremendous damages to China's economic and social developments. It is becoming a more and more important impact factor to public safety. The research on seismic emergency is one of the substantial areas in emergency management. At present, China's governments...
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