Object Orientation in an image

public void getMoments()
        {
            int temp = 0;
            for (int x = 0; x < picture.Width; x++)
            {
                for (int y = 0; y < picture.Height; y++)
                {
                    temp = getIntensity(x, y);
                    m00 += temp;
                    m10 += x * temp;
                    m01 += y * temp;
                    m20 += Math.Pow(x, 2) * temp;
                    m02 += Math.Pow(y, 2) * temp;
                    m11 += x * y * temp;
                }
            }
            u11 = m11 - ((m10 * m01) / m00);
            u20 = m20 - ((m10 * m10) / m00);
            u02 = m02 - ((m01 * m01) / m00);
        }

public double computeOrientation()
       {
           getMoments();
           theta = (double).5 *Math.Atan((2 * u11) / (u20 - u02));
           toDegrees();
           return theta;
       }