Shape Index Map

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Shape Index Map (ImageJ)
Author Johannes Schindelin
Maintainer Johannes Schindelin
Source on GitHub
Initial release 18/08/2010
Latest version 18/08/2010
Category Category:Plugins


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
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

Shape Index-orig.jpg

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

Shape Index-map.jpg