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This paper examines the role of various linguistic structures on text classification applying the study to the Portuguese language. Besides using a bag-of-words representation where we evaluate different measures and use linguistic knowledge for term selection, we do several experiments using syntactic information representing documents as strings of words and strings of syntactic parse trees. To...
In this paper, we present the multichannel median M-type L (MMML) -filter to remove impulsive noise from color images. The proposed technique uses the MM (median M-type) - estimator with simplest influence function in the L filtering algorithm and these are adapted to multichannel image processing applications. The results from known techniques are compared with the proposed method to demonstrate...
In the present paper color image segmentation, based on the notion of critical functions, is investigated. The notion of critical functions is derived from the well-known waterfall transformation. In the one-dimensional case the critical functions and the waterfall transformation provide similar results. However, in the two-dimensional case, the critical functions give better results for segmenting...
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