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hi every body, i have an image which has a picture of a ball in it and i want to find the centroid of that ball so when i display it on a 2dplot i know the exact pixel coord and then i can find it's real coord. the problem is i don't know how how to find or the formula for centroid of an object? thanks for any help, Lucas 

Are you working with binary images. If so, then the following code will
help you find the centroid of the image:
% read the image
i = imread('ball.bmp');
% convert to double
i = double(i);
% invert the image so that we can label the image
% the invert function is not given in the DIP toolbox
% i am attaching it with this email
i = invert(i);
% apply 8connected algo
[labels,count] = bwlabel(i,8);
% calculate features. For more type help imfeature
features = imfeature(labels,'Centroid');
i = 1;
while i <= count
% display centroid of all the
subimages in the image
disp(features.Centroid);
i = i + 1;
end
Hope this helps.
Good luck Zahra Atiq Shah It's Samaritans' Week. Help Samaritans help others. Call 08709 000032 to give or donate online now at http://www.samaritans.org/support/donations.shtm  
 
