Page history Edit this page How do I edit this website?
Original MediaWiki page

Shape Index Map

The content of this page has not been vetted since shifting away from MediaWiki. If you’d like to help, check out the how to help guide!

Name

Shape Index Map

Software

ImageJ

Author

Johannes Schindelin

Maintainer

Johannes Schindelin

Source

on GitHub

Status
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

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