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Drawing shapes in images

I am trying to draw the circle in the center if the images , like the image below

image description

there may be the images of many shapes/size but i want to draw circle/eclipse every time in the same way.

Below is the code i tried for it

        Mat img = imread ("E:\\test.jpg");
        int center_img = (img.rows*img.cols)/2;
        double radius_img = img.rows/2+img.cols/2;
        circle(img,Point(img.rows/2,img.cols/2), img.rows/2,1, 8,0);
        imshow ("img" , img);
        cvWaitKey(0);