Text Recognition with k-means Clustering

A thesaurus is a reference work that lists words grouped together according to similarity of meaning (containing synonyms and sometimes antonyms), in contrast to a dictionary, which contains definitions and pronunciations. This paper proposes an innovative approach to improve the classification performance of Persian texts considering a very large thesaurus. The paper proposes a flexible method to recognize and categorize the Persian texts employing a thesaurus as a helpful knowledge. In the corpus, when utilizing the thesaurus the method obtains a more representative set of word- frequencies comparing to those obtained when the method disables the thesaurus. Two types of word relationships are considered in our used thesaurus. This is the first attempt to use a Persian thesaurus in the field of Persian information retrieval. The k-nearest neighbor classifier, decision tree classifier and k-means clustering algorithm are employed as classifier over the frequency based features. Experimental results indicate enabling thesaurus causes the method significantly outperforms in text classification and clustering.