RegionLabel

RegionLabel[img] labels the connected components of the binary image img.

RegionLabel[img, neigh] labels the connected components of the binary image img using a custom connectivity definition via the list of offsets neigh.

The labeling operation sets all pixels belonging to the same connected component of the image to a specific integer value with each connected component receiving a unique integer label.

The default connectivity settings are ConnectivityNumber→8 for 2D arrays and ConnectivityNumber→26 for 3D arrays.

Custom connectivity settings may be defined using a list of offsets.

The argument img may be an array or ImageData expression.

See also User's Guide 6.5.

New in Version 2.

Example

Here we load the package.

In[1]:=

Here is a 2D example binary-valued array.

In[2]:=

Out[3]//MatrixForm=

Out[3]//MatrixForm=

This finds the connected components using the default connectivity setting.

In[4]:=

Out[4]//MatrixForm=

Out[4]//MatrixForm=

The number of distinct regions may be different if the connectivity is changed.

In[5]:=

Out[5]//MatrixForm=

Out[5]//MatrixForm=

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