11.54. ITK Min Max Curvature Flow Image Filter
Edge-preserving denoising like Curvature Flow, but with a switch that targets a chosen noise scale and better preserves real features.
Group (Subgroup)
ITKCurvatureFlow (CurvatureFlow)
Description
This filter is a variant of ITK Curvature Flow Image Filter. Plain curvature flow smooths every intensity contour according to its curvature; the min/max variant adds a switch that turns smoothing on or off at each point depending on the local image content, so that smoothing is applied where it removes noise but suppressed where it would erode a genuine feature.
The switch is keyed to the stencil radius: the filter looks at the average intensity in a neighborhood of that radius around each point and uses it to decide whether the point sits on noise (smooth it) or on a real structure (leave it). Choosing the stencil radius therefore selects the scale of the noise to remove — a small radius targets fine, single-pixel noise; a larger radius targets coarser texture.
The output pixels are of a floating-point type.
Parameter Guidance
Number Of Iterations — how many time steps to apply. More iterations smooth more strongly.
Time Step — the size of each step (dimensionless). Keep it small for numerical stability (around 0.125 for 2D and 0.0625 for 3D; default 0.05) and reduce if the result looks unstable.
Stencil Radius — the neighborhood radius, in pixels, used by the min/max switch; it sets the scale of noise that is removed. Small values (the default is 2) target fine noise; larger values target coarser features. (Stored as a signed integer, but only non-negative values are meaningful.)
Required Input Sources
Operates on any scalar (floating-point) image — typically from Read Image, Read Images [3D Stack], or the output of a prior ITK image filter.
Reference
“Level Set Methods and Fast Marching Methods”, J.A. Sethian, Cambridge Press, Chapter 16, Second edition, 1999.
See Also
Input Parameter(s)
Parameter Name |
Parameter Type |
Parameter Notes |
Description |
|---|---|---|---|
Time Step |
Scalar Value |
Float64 |
The time step to be used for each iteration. |
Number Of Iterations |
Scalar Value |
UInt32 |
Specifies the number of iterations (time-step updates) that the solver will perform to produce a solution image |
Stencil Radius |
Scalar Value |
Int32 |
Set/Get the stencil radius. |
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: float32, float64 |
The image data that will be processed by this filter. |
Output Cell Data
Parameter Name |
Parameter Type |
Parameter Notes |
Description |
|---|---|---|---|
Output Image Data Array |
DataObjectName |
The result of the processing will be stored in this Data Array. |
Example Pipelines
License & Copyright
Please see the description file distributed with this Plugin
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