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ENH: Make eccentricity more similar to elongation #1743

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May 9, 2024
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ENH: Make eccentricity more similar to elongation #1743

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8 changes: 7 additions & 1 deletion Examples/LabelGeometryMeasures.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -199,7 +199,13 @@ LabelGeometryMeasures(int argc, char * argv[])
// Get principal moments and use them to calculate eccentricity and axes lengths
auto principalMoments = labelObject->GetPrincipalMoments();

double lambda1 = principalMoments[0];
// define in 3D such that it describes the ellipse with axes propotional to the
// two largest principal moments. This is useful eg for cortex, where the thickness
// is much smaller than the other two dimensions.
//
// Roundness gives a more general measure of deviation from a sphere, including all three dimensions.
//
double lambda1 = principalMoments[ImageDimension - 2];
double lambdaN = principalMoments[ImageDimension - 1];
double eccentricity = 0.0;

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