# Blob coloring (or LABEL\_REGION in IDL) **URL:** \ **Category:** Ruby\ **Created:** [February 15, 2006, 9:19pm UTC](https://www.ruby-forum.com/t/blob-coloring-or-label-region-in-idl/53877 "2006-02-15T21:19:17Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![TrentDavey](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/67e7ee/32.png) [@TrentDavey](https://www.ruby-forum.com/u/TrentDavey)\ **Post date:** [February 15, 2006, 9:19pm UTC](https://www.ruby-forum.com/t/blob-coloring-or-label-region-in-idl/53877/1 "2006-02-15T21:19:17Z")
I thought I’d see if anyone has any canned functions/methods or “good ideas” before I wrote code to do this. Given a 2D bilevel (zero’s and non-zero values) array (image), a mask of the same size is returned where each element (pixel) is given a unique region/blob value. Each region/blob is a set of non-zero elements (pixels) surrounded by zeroes. This is done by the LABEL\_REGION function in IDL. ---
**Author:** ![TrentDavey](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/67e7ee/32.png) [@TrentDavey](https://www.ruby-forum.com/u/TrentDavey)\ **Post date:** [February 15, 2006, 11:48pm UTC](https://www.ruby-forum.com/t/blob-coloring-or-label-region-in-idl/53877/2 "2006-02-15T23:48:25Z")
On Thu, 16 Feb 2006, TrentDavey wrote: > I thought I’d see if anyone has any canned functions/methods or “good > ideas” before I wrote code to do this. Given a 2D bilevel (zero’s and > non-zero values) array (image), a mask of the same size is returned > where each element (pixel) is given a unique region/blob value. Each > region/blob is a set of non-zero elements (pixels) surrounded by > zeroes. This is done by the LABEL\_REGION function in IDL. i’m doing a lot of this stuff using the vigra toolkit [http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/](http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/) i’ve been trying to hook it into narray, but have not had time. can i ask what your doing exactly? -a