Extract the contour of the gray-scale image, and the external contour and the internal contour is drawn in the image

contour
.......\Debug
.......\.....\contour.exe
.......\.....\contour.ilk
.......\.....\contour.pdb
.......\.....\tbb_debug.dll
.......\contour
.......\.......\Debug
.......\.......\.....\BuildLog.htm
.......\.......\.....\contour.exe.embed.manifest
.......\.......\.....\contour.exe.embed.manifest.res
.......\.......\.....\contour.exe.intermediate.manifest
.......\.......\.....\contour.obj
.......\.......\.....\mt.dep
.......\.......\.....\vc90.idb
.......\.......\.....\vc90.pdb
.......\.......\Lena.jpg
.......\.......\contour.cpp
.......\.......\contour.vcproj
.......\.......\contour.vcproj.6LDALK8YLQYLKRV.Administrator.user
.......\.......\contour.vcproj.6LDALK8YLQYLKRV.Victor.user
.......\contour.ncb
.......\contour.sln
.......\contour.suo

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