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Proceedings Paper

Knowledge-based automated feature extraction to categorize secondary digitized radiographs
Author(s): Michael Kohnen; Frank Vogelsang; Berthold B. Wein; Markus W. Kilbinger; Rolf W. Guenther; Frank Weiler; Joerg Bredno; Joerg Dahmen
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Paper Abstract

An essential part of the IRMA-project (Image Retrieval in Medical Applications) is the categorization of digitized images into predefined classes using a combination of different independent features. To obtain an automated and content-based categorization, the following features are extracted from the image data: Fourier coefficients of normalized projections are computed to supply a scale- and translation-invariant description. Furthermore, histogram information and Co-occurrence matrices are calculated to supply information about the gray value distribution and textural information. But the key part of the feature extraction is the shape information of the objects represented by an Active Shape Model. The Active Shape Model supports various form variations given by a representative training set; we use one particular Active Shape Model for each image class. These different Active Shape Models are matched on preprocessed image data with a simulated annealing optimization. The different extracted features were chosen with regard to the different characteristics of the image content. They give a comprehensive description of image content using only few different features. Using this combination of different features for categorization results in a robust classification of image data, which is a basic step towards medical archives that allow retrieval results for queries of diagnostic relevance.

Paper Details

Date Published: 6 June 2000
PDF: 9 pages
Proc. SPIE 3979, Medical Imaging 2000: Image Processing, (6 June 2000); doi: 10.1117/12.387733
Show Author Affiliations
Michael Kohnen, Aachen Univ. of Technology (Germany)
Frank Vogelsang, Aachen Univ. of Technology (Germany)
Berthold B. Wein, Aachen Univ. of Technology (Germany)
Markus W. Kilbinger, Aachen Univ. of Technology (Germany)
Rolf W. Guenther, Aachen Univ. of Technology (Germany)
Frank Weiler, Parsytec AG (Germany)
Joerg Bredno, Aachen Univ. of Technology (Germany)
Joerg Dahmen, Aachen Univ. of Technology (Germany)


Published in SPIE Proceedings Vol. 3979:
Medical Imaging 2000: Image Processing
Kenneth M. Hanson, Editor(s)

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