[R] black cluster in salt and pepper image

Gregoire Pau gregoire.pau at embl.de
Mon Mar 8 18:30:52 CET 2010


The function bwlabel() in the Bioconductor package EBImage, extracts the 
connected components of an image. Denoting your binary matrix by x, the 
following code gives you the first 10 largest clusters (in size).

 > library(EBImage)
 > y = bwlabel(x)
 > sort(table(y), dec=TRUE)[1:10]

See http://www.bioconductor.org/packages/release/bioc/html/EBImage.html 
how to download/install EBImage.

Best regards,

Gregoire Pau
EMBL Research Officer

Sylvain Sardy wrote:
> Hi,
> on a lattice, I have binary 0/1 data. 1s are rare and may form clusters. 
> I would like
> to know the size/length of largest cluster. Any help warmly welcome,
> Sylvain.
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