Patent ID: 7370024
Filing Date: 2008-05-06
Classification: G06F

Abstract:
1. A document classification apparatus, comprising; a storage unit for storing a correlation dictionary having registered information indicating a level of correlation between each feature extracted from a set of documents classified into each category of a first category system and each category of the first category system including a plurality of categories, and a classification rule for classification of a document into a category of a second category system including a plurality of categories that are different from the plurality of categories of the first category system; an input unit for inputting an unknown document; a feature extraction unit for extracting a feature from the unknown document; a correlation assignment unit for referring to the correlation dictionary, obtaining the information about the level of the correlation between the feature extracted from the unknown document and each category of the first category system, and adding the obtained information to the feature extracted from the unknown document; a field judge for classifying the unknown document based on the classification rule into a category of the second category system using a feature of the unknown document to which information about the level of the correlation is added; and an output unit for outputting a classification result of the unknown document.