The operation performs a morphological erosion, which is a basic tool used for region shrinking. Similarly to other region morphology operations, erosion is conducted using a shape called kernel (or structuring element). The kernel is repeatedly centered at each location within the dimensions of the input region. Then, pixel location L is added to the resulting region if and only if all of the input region pixels lies inside the kernel centered at this (L) location.

The input parameter inKernel allows to choose the shape of a kernel, while parameters inRadiusX, inRadiusY allow to determine its dimensions. For instance:

• inKernel = Ellipse together with inRadiusX = inRadiusY results in shrinking performed equally in all directions.
• Setting inRadiusX to higher value than inRadiusY results in shrinking performed more significantly along horizontal axis.

• Increase inRadiusX to make the output region thinner.
• Change inKernel to Ellipse to make the filter work equally strongly in each direction (execution will be slower).

ErodeRegion run with inKernel = Ellipse of dimensions inRadiusX = 3, inRadiusY = 3.

This filter can throw an exception to report error. Read how to deal with errors in Error Handling.

List of possible exceptions:

This filter is available on Advanced Complexity Level.

This filter is member of ErodeRegion filter group.

• OpenRegion – Performs a morphological opening on a region using a predefined kernel.

• ErodeRegion_AnyKernel – Performs a morphological erosion on a region using an arbitrary kernel.

• DilateRegion – Performs a morphological dilation on a region using a predefined kernel.