Extracting Contour Coordinate

Hi,

I have a image like this:

http://imgur.com/WlOdYiw

I want to get the coordinates of contour of each cylindrical objects from that image. The way I am doing is too manual. I basically use segmented line and draw contour like this:

http://imgur.com/O7f8AkG

and save xy-coordintes for each object. Is there a faster and automatic way to do this?

Thanks