ImageJ+OpenCV-Finding rocks fragmentation contour in opencast environment

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Hi all. I have a trouble with finding the correct contours of rocks framentation. I use ImageJ Software to get the undefinite contours,but I want to get correct contours,which covers the original photo.My using steps is as followed: 1.type--8bit 2.process--filters--unsharp mask 3.caussian5 4.find max--noise tolierance 45-segmentation particle 5.binary--enrode 6.image -calculate+ Original I have c++ and python basis.If you have good idea to offer help,thanks a lot. Here are my original and processed photos.