11.10. ITK Binary Morphological Closing Image Filter
Fills small holes and thin gaps in the foreground of a binary image (dilation followed by erosion).
Group (Subgroup)
ITKBinaryMathematicalMorphology (BinaryMathematicalMorphology)
Description
Closing is a morphological operation that fills small holes and thin gaps inside and along the borders of foreground objects, without much changing their overall size. It is a dilation followed by an erosion using the same structuring element: Closing(f) = Erosion(Dilation(f)). The dilation fills features smaller than the structuring element (the probe shape swept over the image), and the following erosion shrinks the objects back to roughly their original size. Use it to close up pinholes and cracks in segmented regions. The inverse pairing is ITK Binary Morphological Opening Image Filter, which removes small specks instead.
Parameter Guidance
Foreground Value — the pixel value treated as the object/foreground. Default 1.
Kernel Radius — the radius of the structuring element, in pixels (one value per axis). Holes/gaps smaller than this are filled.
Safe Border — when on (default), a temporary border is added around the image during processing to avoid edge artifacts and removed afterward.
Kernel Type
The Kernel Type parameter selects the structuring element shape:
Annulus [0]: A ring-shaped structuring element.
Ball [1]: A spherical structuring element (default). Most commonly used for general morphological operations.
Box [2]: A rectangular/cuboid structuring element.
Cross [3]: A cross-shaped structuring element.
Required Input Sources
Operates on a binary/segmented image — typically the output of a thresholding filter such as ITK Binary Threshold Image Filter or Multi-Threshold Objects.
Reference
G. Lehmann, “Binary morphological closing and opening image filters,” Insight Journal, https://www.insight-journal.org/browse/publication/58.
Input Parameter(s)
Parameter Name |
Parameter Type |
Parameter Notes |
Description |
|---|---|---|---|
Kernel Radius |
Vector of UInt32 Values |
Order=X,Y,Z |
The radius of the kernel structuring element. |
Kernel Type |
Choices |
Set the kernel or structuring element used for the morphology. |
|
Foreground Value |
Scalar Value |
Float64 |
Set the value in the image to consider as ‘foreground’. Defaults to maximum value of InputPixelType. |
Safe Border |
Bool |
A safe border is added to input image to avoid borders effects and remove it once the closing is done |
Input Cell Data
Parameter Name |
Parameter Type |
Parameter Notes |
Description |
|---|---|---|---|
Image Geometry |
Geometry Selection |
Image |
Select the Image Geometry Group from the DataStructure. |
Input Cell Data |
Array Selection |
Allowed Types: int8, uint8, int16, uint16, int32, uint32, int64, uint64 |
The image data that will be processed by this filter. |
Output Cell Data
Parameter Name |
Parameter Type |
Parameter Notes |
Description |
|---|---|---|---|
Output Cell Data |
DataObjectName |
The result of the processing will be stored in this Data Array inside the same group as the input data. |
Example Pipelines
License & Copyright
Please see the description file distributed with this Plugin
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