centroid.m

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% % Copyright 2016 Mayuresh Sarpotdar
% % 
% %    Licensed under the Apache License, Version 2.0 (the "License");
% %    you may not use this file except in compliance with the License.
% %    You may obtain a copy of the License at
% % 
% %        http://www.apache.org/licenses/LICENSE-2.0
% % 
% %    Unless required by applicable law or agreed to in writing, software
% %    distributed under the License is distributed on an "AS IS" BASIS,
% %    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
% %    See the License for the specific language governing permissions and
% %    limitations under the License.
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function [x,y] = centroid(img,reg_img,region_count)
[row, col] = size(img);
num_row = 0;
num_col = 0;
den = 0;
for i=1:row
    for j=1:col
        if (reg_img(i,j) == region_count)
            num_row = num_row + i*img(i,j);
            num_col = num_col + j*img(i,j);
            den = den + img(i,j);
        end
    end
end

x = num_col/den;
y = num_row/den;

end