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function [C] = OElocate(BW,Center,R) 
C = []; 
Q = 0; 
totle = sum(sum(BW)); 
 
delta_r = [1:min(size(BW))]; 
delta_r = min(size(BW))./delta_r+delta_r; 
delta_r = find(delta_r == min(delta_r)); 
 
try 
    Rmin = R(1); 
catch 
    Rmin = 1; 
end 
try 
    Rmax = R(2); 
catch 
    Rmax = size(BW,1); 
end 
 
for i = 1 : size(Center,2) 
    xc = Center(1,i); 
    yc = Center(2,i); 
    r = Rmin+delta_r/2; 
    while (yc+r-delta_r <= size(BW,1)) & (xc+r-delta_r <= size(BW,2)) %| 1 
        Qt = cir_quad(BW,xc,yc,r,delta_r); 
        if Q < Qt 
            Q = Qt; 
            C = [xc,yc,r]; 
            if  Q >= 0.5*totle 
                break; 
            end 
        end 
        r = r + delta_r; 
    end 
end 
 
%¾«¶¨Î» 
Q = 0; 
for r = C(3)-delta_r/2 : C(3)+delta_r/2 
    Qt = cir_quad(BW,C(1),C(2),r,1); 
    if Q < Qt 
        Q = Qt; 
        C(3) = r; 
        %break; 
    end 
end