Canny edge detection algorithm, has been tried, you can use. To better edge detection.

Canny边缘检测算法vc++\Canny边缘检测\测试图片\Thumbs.db
.....................\.............\........\原始lena图像.bmp
.....................\.............\........\用canny算子提取边缘.bmp
.....................\.............\源代码\cdib.cpp
.....................\.............\......\cdib.h
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.....................\.............\......\ChildFrm.h
.....................\.............\......\ColorTable.h
.....................\.............\......\Debug\cdib.obj
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.....................\.............\......\.....\ChildFrm.obj
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.....................\.............\......\.....\ImageProcessing.exe
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.....................\.............\......\.....\ImageProcessing.obj
.....................\.............\......\.....\ImageProcessing.pch
.....................\.............\......\.....\ImageProcessing.pdb
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.....................\.............\......\.....\ImageProcessingDoc.obj
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.....................\.............\......\.....\ImageProcessingView.obj
.....................\.............\......\.....\ImageProcessingView.sbr
.....................\.............\......\.....\MainFrm.obj
.....................\.............\......\.....\MainFrm.sbr
.....................\.............\......\.....\SegApi.obj
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.....................\.............\......\.....\StdAfx.obj
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.....................\.............\......\.....\vc60.idb
.....................\.............\......\.....\vc60.pdb
.....................\.............\......\DIBPrcs.cpp
.....................\.............\......\GlobalApi.h
.....................\.............\......\ImageProcessing.aps
.....................\.............\......\ImageProcessing.clw
.....................\.............\......\ImageProcessing.cpp
.....................\.............\......\ImageProcessing.dsp
.....................\.............\......\ImageProcessing.dsw
.....................\.............\......\ImageProcessing.h
.....................\.............\......\ImageProcessing.ncb
.....................\.............\......\ImageProcessing.opt
.....................\.............\......\ImageProcessing.plg
.....................\.............\......\ImageProcessing.rc
.....................\.............\......\ImageProcessingDoc.cpp
.....................\.............\......\ImageProcessingDoc.h
.....................\.............\......\ImageProcessingView.cpp
.....................\.............\......\ImageProcessingView.h
.....................\.............\......\MainFrm.cpp
.....................\.............\......\MainFrm.h
.....................\.............\......\ReadMe.txt
.....................\.............\......\Recog.asp
.....................\.............\......\res\ImageProcessing.ico
.....................\.............\......\...\ImageProcessing.rc2
.....................\.............\......\...\ImageProcessingDoc.ico
.....................\.............\......\...\Toolbar.bmp
.....................\.............\......\Resource.h
.....................\.............\......\SegApi.cpp
.....................\.............\......\StdAfx.cpp
.....................\.............\......\StdAfx.h
.....................\.............\......\Debug
.....................\.............\......\res
.....................\.............\测试图片
.....................\.............\源代码
.....................\Canny边缘检测
Canny边缘检测算法vc++

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