public class RegionAdjacencyGraph extends Object
Contains several methods for extracting the set of adjacencies between regions in a label image.
The value zero is assumed to be background, and is not computed for adjacencies. Moreover, in order to take into account label images obtained after a watershed transform, adjacencies are computed by comparing label values with the values of neighbors shifted by two pixels in the X, Y or Z directions.
Usage:
// create demo image with four regions, and four adjacencies
byte[] data = new byte[]{
1, 1, 1, 0, 2, 2,
1, 1, 1, 0, 2, 2,
0, 0, 0, 0, 2, 2,
3, 3, 0, 0, 0, 0,
3, 3, 0, 4, 4, 4,
3, 3, 0, 4, 4, 4};
ImageProcessor image = new ByteProcessor(6, 6, data);
// compute adjacencies, and return result as a set of label pairs
Set<RegionAdjacencyGraph.LabelPair> adjacencies =
RegionAdjacencyGraph.computeAdjacencies(image);
// display which regions are adjacent
for (RegionAdjacencyGraph.LabelPair pair : adjacencies)
{
System.out.println("(" + pair.label1 + "," + pair.label2 + ")");
}
Modifier and Type | Class and Description |
---|---|
static class |
RegionAdjacencyGraph.LabelPair
Used to stores the adjacency information between two regions.
|
Modifier and Type | Method and Description |
---|---|
static Set<RegionAdjacencyGraph.LabelPair> |
computeAdjacencies(ij.ImagePlus image)
Returns the set of region adjacencies in an ImagePlus, that can contains
either an ImageProcessor or an ImageStack.
|
static Set<RegionAdjacencyGraph.LabelPair> |
computeAdjacencies(ij.process.ImageProcessor image)
Returns the set of region adjacencies in an ImageProcessor of labels.
|
static Set<RegionAdjacencyGraph.LabelPair> |
computeAdjacencies(ij.ImageStack image)
Returns the set of region adjacencies in an ImageProcessor of labels.
|
public static final Set<RegionAdjacencyGraph.LabelPair> computeAdjacencies(ij.ImagePlus image)
image
- an ImagePlus containing a 2D or 3D label imagepublic static final Set<RegionAdjacencyGraph.LabelPair> computeAdjacencies(ij.process.ImageProcessor image)
image
- an ImageProcesor containing a label imagepublic static final Set<RegionAdjacencyGraph.LabelPair> computeAdjacencies(ij.ImageStack image)
image
- an ImageProcesor containing a label imageCopyright © 2014–2023 INRA-IJPB Modeling and Digital Imaging lab. All rights reserved.