A web content mining approach for tag cloud generation
Tag cloud, also known as word cloud, are very useful for quickly perceiving the most prominent terms embedded within a text collection to determine their relative prominence. The effectiveness of tag clouds to conceptualize a text corpus is directly proportional to the quality of the keyphrases extracted from the corpus. Although, authors provide a list of about five to ten keywords in scientific publications that are used to map them into their respective domain, due to exponential growth in non-scientific documents on the World Wide Web, an automatic mechanism is sought to identify keyphrases embedded within them for tag cloud generation. In this paper, we propose a web content mining technique to extract keyphrases from web documents for tag cloud generation. Instead of using partial or full parsing, the proposed method applies n-gram technique followed by various heuristics-based refinements to identify a set of lexical and semantic features from text documents. We propose a rich set of domain-independent features to model candidate keyphrases very effectively for establishing their keyphraseness using classification models. We also propose a font-determination function to determine the relative font-size of keyphrases for tag cloud generation. The efficacy of the proposed method is established through experimentation. The proposed method outperforms the popular keyphrase extraction system KEA.