11.32. ITK Grayscale Dilate Image Filter

Replaces each pixel with the maximum value in its neighborhood — a grayscale dilation that brightens the image and grows bright regions.

Group (Subgroup)

ITKMathematicalMorphology (MathematicalMorphology)

Description

Grayscale dilation replaces each pixel with the maximum value found within the neighborhood defined by the structuring element (the probe shape — ball, box, etc. — swept over the image). The effect is to brighten the image, grow bright regions, and shrink dark ones. It is the grayscale counterpart of binary dilation and the building block of grayscale opening, closing, and top-hat filters.

Parameter Guidance

  • Kernel Radius — the radius of the structuring element, in pixels (one value per axis). Larger radii grow bright regions more.

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 any scalar (grayscale) image — typically from Read Image, Read Images [3D Stack], or the output of a prior ITK image filter.

Grayscale dilation example.

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.

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, float32, float64

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

DREAM3D-NX Help

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