MATLAB: How to find the distance between two random selected blobs in an Image

Question

Hi, i have couple of Images in which I need to find the distance between the selected two blobs in an image. I have used "ginput(2)" to select the two blobs in the image.

I have used the following attached code but facing some errors in it. I used few lines of code from matlabcentral and added it to my code.

I am getting error as –

 Index exceeds matrix dimensions.
 Error in meandistanceSample (line 53)
 boundary2 = boundaries{2};

Here are the two Images that I need to analyze. Can any one help me.

Thanks…

Answer 1

The loop at the bottom should not find the distance of every blob to every other blob, but from every blob to the x,y points you clicked on. If you clicked near, or in, blobs #50 and #73, then you first need to get indexes 50 and 73 - you don't care how close blob #12 is to blob #98 or whatever. So you just see what's closest to where you clicked. Once you know that, that the user pointed to blob #50 and blob #73, then you can get the distance between them using their centroids. Give that a try and come back with your new code.