document: Deriving knowledge from figures for digital libraries Figures in digital documents contain important information . Current digital libraries do not summarize and index information available within figures for document retrieval . We present our system on automatic categorization of figures and extraction of data from 2-D plots . A machine-learning based method is used to categorize figures into a set of predefined types based on image features . An automated algorithm is designed to extract data values from solid line curves in 2-D plots . The semantic type of figures and extracted data values from 2-D plots can be integrated with textual information within documents to provide more effective document retrieval services for digital library users . Experimental evaluation has demonstrated that our system can produce results suitable for real-world use .
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