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OpenRegion

Module:	FoundationBasic

Performs a morphological opening on a region using a predefined kernel.

Applications

Removing small parts from a region without making it thinner.

Name	Type	Range	Description
inRegion	Region		Input region
inKernel	KernelShape		Kernel shape (predefined)
inRadiusX	Integer	0 -	Nearly half of the kernel's width (2*R+1)
inRadiusY	Integer *	0 -	Nearly half of the kernel's height (2*R+1), or same as inRadiusX
outRegion	Region		Output region

Description

The operation performs a morphological opening, which is a tool used for removing thin parts from a region. The operation is a convolution of two basic morphological operations:

Firstly, the input region is eroded using ErodeRegion operation.
Then, the resulting region is dilated using DilateRegion operation.

During the erosion thin parts of a region are eliminated, while further dilation assures that the width of region limbs is preserved.

Both of the component operations are conducted using the same inKernel, inRadiusX and inRadiusY parameters.

Hints

Increase inRadiusX to remove more small parts from the region.
Change inKernel to Ellipse to make the filter work equally strongly in each direction (execution will be slower).

Examples

Description of usage of this filter can be found in examples and tutorial: Molybdenum Foil, Rubber Ring, Rubber Ring (Simple), Finding PCB Missing Covering.

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

Errors

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

List of possible exceptions:

Error type	Description
DomainError	Unsupported kernel in OpenRegion.

Complexity Level

This filter is available on Advanced Complexity Level.

Filter Group

This filter is member of OpenRegion filter group.