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Shape Index Map

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The shape index describes the surface topology of the image interpreted as a height field:

shape index 1 0.75 0.5 0.25 0 -0.25 -0.5 -0.75 -1
meaning cap dome ridge saddle ridge saddle saddle rut rut trough cup

The shape index is calculated from the principal curvatures of the Hessian, which is very susceptible to noise. Therefore the plugin asks you to specify a radius for Gaussian blurring as a preprocessing step.


With radius 2, this results in the following shape index map (bright spots correspond to caps, dark to cups):