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