Intensity based clusters / centers of gravity in greyscale image

Question

Chris on 8 Feb 2014

Answered: Image Analyst on 8 Feb 2014

Hi,

I would like to find the two centers of gravity in the following greyscale image (color coded for easier visualization):

I have tried

kmeans(image(:), 3, 'start','uniform');

but this only finds one large cluster. kmeans is probably unsuitable for this task.

How can I find the two centers of gravity?

Answer 1

Image Analyst on 8 Feb 2014

Split them apart first with watershed. Then simply threshold and call regionprops and ask for the WeightedCentroid. See my Image Analysis Tutorial http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 for an example of how to find centroids.