I have an Image taken from Camera . Using Aforge.net , i have filtered the image and got the 2d coordinate of the circle in the picture. Now i want to make a real world image and get the co-ordinate of the circle in the real world (3d coordinate) with reference to the camera location. How can i get it.. please help...

I have an Image taken from Camera . Using Aforge.net , i have filtered the image and got the 2d coordinate of the circle in the picture. Now i want to make a real world image and get the co-ordinate of the circle in the real world (3d coordinate) with reference to the camera location. How can i get it.. please help...