3 March 2014 Agglomerative clustering using hybrid features for image categorization
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This research project describes an agglomerative image clustering technique that is used for the purpose of automating image categorization. The system is implemented in two stages: feature vector formation, and feature space clustering. The features that we selected are based on texture salience (Gabor filters and a binary pattern descriptor). Global properties are encoded via a hierarchical spatial pyramid and local structure is encoded as a bit string, retained via a set of histograms. The transform can be computed efficiently – it involves only 16 operations (8 comparisons and 8 additions) per 3x3 region. A disadvantage is that it is not invariant to rotation or scale changes; however, the spatial pyramid representing global structure helps to ameliorate this problem. An agglomerative clustering technique is implemented and evaluated based on ground-truth values and a human subjective rating.
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Karina Damico, Karina Damico, Roxanne L. Canosa, Roxanne L. Canosa, } "Agglomerative clustering using hybrid features for image categorization", Proc. SPIE 9027, Imaging and Multimedia Analytics in a Web and Mobile World 2014, 90270N (3 March 2014); doi: 10.1117/12.2042358; https://doi.org/10.1117/12.2042358

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