Using OpenCV and visual of C++ to achieve can correctly extract the image foreground contour, with the MFC programming, can be directly compiled and run.

ContourExtract\ContourExtract\ContourExtract.aps
..............\..............\ContourExtract.cpp
..............\..............\ContourExtract.h
..............\..............\ContourExtract.rc
..............\..............\ContourExtract.vcproj
..............\..............\ContourExtract.vcproj.PC-201105161948.Administrator.user
..............\..............\ContourExtract.vcproj.PC-201201202114.Administrator.user
..............\..............\ContourExtractDlg.cpp
..............\..............\ContourExtractDlg.h
..............\..............\Debug\BuildLog.htm
..............\..............\.....\ContourExtract.exe.embed.manifest
..............\..............\.....\ContourExtract.exe.embed.manifest.res
..............\..............\.....\ContourExtract.exe.intermediate.manifest
..............\..............\.....\ContourExtract.obj
..............\..............\.....\ContourExtract.pch
..............\..............\.....\ContourExtract.res
..............\..............\.....\ContourExtractDlg.obj
..............\..............\.....\mt.dep
..............\..............\.....\stdafx.obj
..............\..............\.....\vc90.idb
..............\..............\.....\vc90.pdb
..............\..............\ReadMe.txt
..............\..............\res\ContourExtract.ico
..............\..............\...\ContourExtract.rc2
..............\..............\resource.h
..............\..............\stdafx.cpp
..............\..............\stdafx.h
..............\..............\targetver.h
..............\ContourExtract.ncb
..............\ContourExtract.sln
..............\ContourExtract.suo
..............\Debug\ContourExtract.exe
..............\.....\ContourExtract.ilk
..............\.....\ContourExtract.pdb
..............\ContourExtract\Debug
..............\..............\res
..............\ContourExtract
..............\Debug
ContourExtract

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