How to smoothen a curve so I can separate 2 objects?

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Eric 2012-2-24

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Greetings to all.

I wish to smoothen a curve drawn in an image, so I can separate it into 2 objects.

Here is the code used to produce the curve:

    THETA=linspace(0,pi,cirP);
    Radii = abs( drawPoint(1,2) - cenDraw(1,2) );
    [cirCoorX cirCoorY] = pol2cart(THETA,Radii);
    cirCoorY = cirCoorY + cenDraw(1,1);
    cirCoorX = cirCoorX + cenDraw(1,2);
    cirCoor = zeros( cirP, 2 );
    cirCoor(:,1) = cirCoorY;
    cirCoor(:,2) = cirCoorX;
    % round up the decimal to integer
    cirCoor2 = cirCoor;
    for i = 1 : cirP
        yCoor = cirCoor2(i,1);
        xCoor = cirCoor2(i,2);
        yCoorUp = ceil(yCoor);
        xCoorUp = ceil(xCoor);
        if yCoorUp ~= yCoor
            yDiff = yCoorUp - yCoor;
            if yDiff >= 0.5
                yCoor = ceil(yCoor);
            else
                yCoor = floor(yCoor);
            end
        end
        if xCoorUp ~= xCoor
            xDiff = xCoorUp - xCoor;
            if xDiff >= 0.5
                xCoor = ceil(xCoor);
            else
                xCoor = floor(xCoor);
            end
        end 
        cirCoor2(i,1) = yCoor;
        cirCoor2(i,2) = xCoor;        
    end 
   %%Draw the arc   
   bwFil2 = bwFil;
   for i = 1 : cirP
       yBlack = cirCoor2(i,1);
       xBlack = cirCoor2(i,2);       
       bwFil2(yBlack,xBlack) = 0;
       % figure; imshow(bwFil2); title('bwFil2')
   end