Vs2010+opencv2.4.9 image preprocessing, get grayscale, two values, the edge of the map

rewritefirst
............\Debug
............\.....\rewritefirst.exe
............\.....\rewritefirst.ilk
............\.....\rewritefirst.pdb
............\rewritefirst
............\............\Debug
............\............\.....\CL.read.1.tlog
............\............\.....\CL.write.1.tlog
............\............\.....\link-cvtres.read.1.tlog
............\............\.....\link-cvtres.write.1.tlog
............\............\.....\link.3404-cvtres.read.1.tlog
............\............\.....\link.3404-cvtres.write.1.tlog
............\............\.....\link.3404.read.1.tlog
............\............\.....\link.3404.write.1.tlog
............\............\.....\link.5028-cvtres.read.1.tlog
............\............\.....\link.5028-cvtres.write.1.tlog
............\............\.....\link.5028.read.1.tlog
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............\............\.....\link.5804-cvtres.read.1.tlog
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............\............\.....\link.5804.read.1.tlog
............\............\.....\link.5804.write.1.tlog
............\............\.....\link.read.1.tlog
............\............\.....\link.write.1.tlog
............\............\.....\mt.read.1.tlog
............\............\.....\mt.write.1.tlog
............\............\.....\rc.read.1.tlog
............\............\.....\rc.write.1.tlog
............\............\.....\rewritefirst.exe.embed.manifest
............\............\.....\rewritefirst.exe.embed.manifest.res
............\............\.....\rewritefirst.exe.intermediate.manifest
............\............\.....\rewritefirst.lastbuildstate
............\............\.....\rewritefirst.log
............\............\.....\rewritefirst.obj
............\............\.....\rewritefirst.vcxprojResolveAssemblyReference.cache
............\............\.....\rewritefirst.write.1.tlog
............\............\.....\rewritefirst_manifest.rc
............\............\.....\vc100.idb
............\............\.....\vc100.pdb
............\............\rewritefirst.cpp
............\............\rewritefirst.vcxproj
............\............\rewritefirst.vcxproj.filters
............\............\rewritefirst.vcxproj.user
............\rewritefirst.sdf
............\rewritefirst.sln
............\rewritefirst.suo

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