ConnectedComponentsToImage

MLModule

author	MeVis Medical Solutions AG
package	MeVisLab/Standard
dll	MLCluster
definition	MLCluster.def
see also	ComputeConnectedComponents, FilterConnectedComponents, ConnectedComponentsInfo
keywords	region, segmentation, cluster, neighborhood

Purpose

The module ConnectedComponentsToImage converts a cluster structure back to an ML image.

Details

The image information (image extent, page extent, world-to-voxel matrix) is stored in the cluster structure and is used to set up the module’s output image.

The clusters are ranked by their size. The largest cluster has the rank 1, the second largest cluster has the rank 2, and so on. If clusters have the same size, the rank may differ on different platforms (OS, compiler), because the sorting function may behave differently. The background has always rank 0, although it may not be larger than the cluster with rank 1.

Windows

Default Panel

Input Fields

inClusters

name: inClusters, type: SelectedClusters(MLBase)

For accessing this object via scripting, see the Scripting Reference: MLSelectedClustersWrapper.

Output Fields

output0

name: output0, type: Image

Parameter Fields

Field Index

Background Value: Double

Clear: Trigger

Cluster Value: Double

Update: Trigger

Update Mode: Enum

Use Bounding Box Of Selected Clusters: Bool

Write To Image Mode: Enum

Visible Fields

Update Mode

name: updateMode, type: Enum, default: AutoClear

Defines the update behavior of this module.

Values:

Title	Name	Description
​Clear	​AutoClear	​On any input or parameter field change, the module clears its output.
​Update	​AutoUpdate	​On any input or parameter field, the module computes the output ML image anew.

Update

name: update, type: Trigger

When pressed, the output ML image is computed anew.

Clear

name: clear, type: Trigger

When pressed, the module’s output is cleared.

Write To Image Mode

name: writeToImageMode, type: Enum, default: Rank

Defines the mode that is used to write the cluster information to the output ML image.

Values:

Title	Name	Description
​Rank	​Rank	​The rank of each cluster is set as the voxel value.
​Num Voxels	​NumVoxels	​The number of voxels is written as a voxel value for each voxel of a cluster. Background voxels are set to 0.
​Volume In Milliliters	​VolumeInMilliliters	​The volume of the cluster in milliliters is written as a voxel value.
​Fixed Values	​FixedValues	​Fixed values for cluster objects and for the background are written. Each cluster voxel will have the same value in the output image.
​User Data	​UserData	​The user data value of each cluster is written as a voxel value. By default, the user data value of a cluster is set to its rank. With Python scripting, the user data can be set to any value of type double.

Cluster Value

name: clusterValue, type: Double, default: 1

Sets a cluster object value if Write To Image Mode is set to Fixed.

Background Value

name: backgroundValue, type: Double, default: 0

Sets a background value if Write To Image Mode is set to Fixed.

Use Bounding Box Of Selected Clusters

name: useBoundingBoxOfSelectedClusters, type: Bool, default: FALSE

If checked, the output image is only as big as the selected clusters’ bounding box.