11.11. ITK Binary Morphological Opening Image Filter
Removes small foreground specks and thin protrusions from a binary image (erosion followed by dilation).
Group (Subgroup)
ITKBinaryMathematicalMorphology (BinaryMathematicalMorphology)
Description
Opening is a morphological operation that removes small foreground features — isolated specks, thin protrusions, and narrow bridges — that are smaller than the structuring element (the probe shape swept over the image), while leaving larger objects close to their original size. It is an erosion followed by a dilation using the same structuring element: Opening(f) = Dilation(Erosion(f)). The erosion deletes the small features and the following dilation restores the surviving objects to roughly their original size. The inverse pairing is ITK Binary Morphological Closing Image Filter, which fills small holes instead.
Parameter Guidance
Foreground Value — the pixel value treated as the object/foreground. Default 1.
Background Value — the value used for removed/background pixels. Default 0.
Kernel Radius — the radius of the structuring element, in pixels (one value per axis). Features smaller than this are removed.
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. |
|
Background Value |
Scalar Value |
Float64 |
Set the value in eroded part of the image. Defaults to zero |
Foreground Value |
Scalar Value |
Float64 |
Set the value in the image to consider as ‘foreground’. Defaults to maximum value of PixelType. |
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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