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8 June 2012 Classifying chart images with sparse coding
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We present an approach for classifying chart images with sparse coding. Three chart categories are considered: bar charts, pie charts and line graphs. We introduce the Laplacian of Gaussian (LoG) to smooth noise in the image and detect candidate regions of interest. Noting that charts typically contain both text and graphics, we identify text and graphic regions and learn informative features from them. Each image is then represented by a feature vector, which can be used to learn a sparse representation via the dictionary learning algorithm for classification. We evaluate the proposed systematic approach by a set of charts drawn from the internet. The encouraging results certifies the proposed method.
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Jinglun Gao, Yin Zhou, and Kenneth E. Barner "Classifying chart images with sparse coding", Proc. SPIE 8365, Compressive Sensing, 83650G (8 June 2012);

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