Advise on object detection

Hi all,

I have a bunch of pictures like this one:

(http://cid-1627b3c28e2dc281.spaces.live.com/photos/cns!
1627B3C28E2DC281!125 )

(A picture of rocks with soil between them)

I would like to detect and extract every single rock in the picture.
What would be the best way to do this? I have tried using Canny edge
detection to find each rock, but even though the contrast between rock
and soil is quite high, I don't get all the edges in the picture.

Also I would like to find the green box which is somewhere at the
center of the picture. How would you suggest that I do that?

Best regards,
Bjarne
.

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