This procedure is to use OpenCV2.44+ VS2008 VC++ development, you can use the Hough transform to extract line segments.

Hough_OpenCV244\Debug\Hough.exe
...............\.....\Hough.ilk
...............\.....\Hough.pdb
...............\Hough\app.ico
...............\.....\app.rc
...............\.....\AssemblyInfo.cpp
...............\.....\Debug\app.res
...............\.....\.....\AssemblyInfo.obj
...............\.....\.....\BuildLog.htm
...............\.....\.....\Hough.exe.intermediate.manifest
...............\.....\.....\Hough.Form1.resources
...............\.....\.....\Hough.obj
...............\.....\.....\Hough.pch
...............\.....\.....\mt.dep
...............\.....\.....\stdafx.obj
...............\.....\.....\vc90.idb
...............\.....\.....\vc90.pdb
...............\.....\Form1.h
...............\.....\Form1.resx
...............\.....\Hough.cpp
...............\.....\Hough.vcproj
...............\.....\Hough.vcproj.LG-PC.LG.user
...............\.....\Hough.vcproj.PC-201004211309.Administrator.user
...............\.....\ReadMe.txt
...............\.....\..lease\app.res
...............\.....\.......\AssemblyInfo.obj
...............\.....\.......\BuildLog.htm
...............\.....\.......\Hough.exe.intermediate.manifest
...............\.....\.......\Hough.Form1.resources
...............\.....\.......\Hough.obj
...............\.....\.......\Hough.pch
...............\.....\.......\mt.dep
...............\.....\.......\stdafx.obj
...............\.....\.......\vc90.idb
...............\.....\.......\vc90.pdb
...............\.....\resource.h
...............\.....\stdafx.cpp
...............\.....\stdafx.h
...............\Hough.ncb
...............\Hough.sln
...............\Hough.suo
...............\Release\Hough.exe
...............\.......\Hough.pdb
...............\Hough\Debug
...............\.....\Release
...............\Debug
...............\Hough
...............\Release
Hough_OpenCV244

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