how to pick component near to other components

lets say i have 10 componets in binarized image 7 of them are near to each other but 3 are far away.

Is there any way to pick only components near to each other?

Answer 1

[Image Analyst]

See my Image Segmentation Tutorial http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

Just find the centroid of everything and then find the distances of all blobs to all other blobs. Examine that to find which are close or far away. Perhaps you might also use kmeans() in the Statistics Toolbox if you know that there will always be two clusters.