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Variables applied in a NMR image decomposition with the aid of GCCA

Grzegorek M.

Journal of Medical Informatics & Technologies

2008

Vol. 12

183--187

The paper describes the influence of variable selection on an image decomposition. A NMR image is a source of a set of variables describing pixels of the image: gray level, gradient magnitude and seven variables derived from gradient magnitudes of neighbouring pixels. A selection of the variables is the essence of the matter at this stage of the image processing. Two suggestions are proposed and tested: a normalization of gradient magnitude of the pixel by dividing it by a value of the gray level, and development of a nonlinear sequence of thresholds which are used in comparison of adjacent pixels.