finding connected component of a given pixel in binary image

Question

i want to find a connected component of a given pixel, and then test if another pixel belong to this component in matlab.

CC = bwconncomp(BW);
numPixels = cellfun(@numel,CC.PixelIdxList);
...

how to loop for all CC, and for each one, and test if a given pixels belong to it!

Shai · Accepted Answer · 2014-03-26 13:16:24Z

6

I think you'd be better off representing the connected components as a labeled image

lb = bwlabel( BW );

Now, each pixel in BW has a label (1..N) while background pixels remains 0.
You can test for pixel x,y what is its label:

 lb( y, x )

You can compare the labels of two pixels

 lb( y1, x1 ) == lb( y2, x2 )

answered Mar 26, 2014 at 13:16

Shai

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