Lillholm, M; Griffin, LD; (2009) Statistics and category systems for the shape index descriptor of local 2nd order natural image structure. Image and Vision Computing , 27 (6) 771 - 781. 10.1016/j.imavis.2008.08.003.
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The shape index offers a natural and invariant description of pure 2nd order image structure. We discuss its properties and report novel natural image statistics for the shape index and the additional two parameters of curvedness and principal direction that form a complete and decoupled re-parameterisation of 2nd order structure. In a second main theme, we address three separate avenues to a categorisation of the shape index for natural images and Suggest five feature categories as a natural 2nd order image structure 'alphabet'.
|Title:||Statistics and category systems for the shape index descriptor of local 2nd order natural image structure|
|Keywords:||Local image structure, Image features, Natural image statistics, RECEPTIVE-FIELDS, STRIATE CORTEX, EDGE-DETECTION, TEXTURE, TEXTONS, FILTERS, FEATURES, CELLS, MODEL|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Computer Science|
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