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Shape Index Map

    Name

    Shape Index Map

    Software

    ImageJ

    Author

    Johannes Schindelin

    Maintainer

    Johannes Schindelin

    Source

    on GitHub

    Status
    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

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