How manually deselect an object after segmentaion?

I have been doing Cell segmentation using circular hough transform. I used imfindcircles to detect cells and RemoveOverLap to remove some unwanted overlaps. everything seems to work fine but i need to give the user the ability to deselect any of cells. i have been playing around and because cell detection is based on the center and radius , if i want to delete any of the cells i need both center and radius, i could manage to get the center but no luck with radius. i need to somehow either get the radius or delete segmented cell some other way. below are the codes i am using:

image url: http://i40.tinypic.com/2hri9si.jpg

         img1 = imread('Overlap_3.jpg');
         img = rgb2gray(img1);
         threshold = graythresh(img);
         img = im2bw(img,threshold);
         img = ~img;
         img = imfill(img,'holes');
         figure, imshow(img);
         img = bwareaopen(img,150);
         %figure, imshow(img);

         [centers, radii] = imfindcircles(img,[30 50],'Sensitivity',0.95,'Edge',0.8);
         %figure, imshow(img);
         figure, imshow(img1);
         hold on
         viscircles(centers, radii,'EdgeColor','g')

         [centersNew, radiiNew]=RemoveOverLap(centers,radii,40,2);
         figure, imshow(img1);
         hold on
         viscircles(centersNew, radiiNew,'EdgeColor','g');

         length(centersNew)

thank you in advanced

Answer 1

[Image Analyst]

If you use ginput, then check which of the centers is closest to that will let you know which circle the user pointed to.

[Aidin]

I have not used ginput so far, but it seems pretty much what i needed to do. Thank you so much i will update if it worked.

Answer 2

[Walter Roberson]

Take your img and bwlabel it. When the user selects a cell using something like ginput(), round the coordinates to the closest integers, index the label image at that coordinate to find the index of the blob it is. Set all pixels with the same label clear. You can then proceed with finding the circles or whatever.

[Aidin]

The problem is i dont want to use bwlable cause i am already using hough transform for circular detection.