環境 Visual Studio 2010 + OpenCV 2.3.1
環境配置可參考下文http://www.opencv.org.cn/forum/viewtopic.php?f=1&t=14545
近來研究tracking相關問題，涉及到interest point的提取，應用到了"opencv2\features2d\features2d.hpp"，然而，vs的IntelliSense沒有報錯，在編譯的時候出現如下錯誤：
錯誤 2 error LNK2019: 無法解析的外部符號 "public: __thiscall cv::SurfFeatureDetector::SurfFeatureDetector(double,int,int,bool)" (??0SurfFeatureDetector@cv@@QAE@NHH_N@Z)，該符號在函數 _main 中被引用 E:\Coding\VS 2010\GroupBehaviour\Histogram\Histogram\Histogram.obj Histogram
這個錯誤的原因，我剛開始猜測是因為VS沒有找到相應的定義，或者是根本就找不到"opencv2\features2d\features2d.hpp"中的SurfFeatureDetector，所以應該是配置問題，所以我搜了一些關於環境配置的內容，但都沒有找到原因，最后在StackOverFlow上面
http://stackoverflow.com/questions/8272707/opencv-2-2-vs2010-get-an-access-violation-reading-in-a-very-simple-code
看到一個回答
You need ensure that the following "Additional Dependencies" under the the Properties->Linker->Input are referring to the correct OpenCV libraries with debugger support.
i.e.
C:\OpenCV2.2\lib\opencv_calib3d220d.lib
C:\OpenCV2.2\lib\opencv_core220d.lib
C:\OpenCV2.2\lib\opencv_features2d220d.lib
-------------------
C:\OpenCV2.2\lib\opencv_highgui220d.lib
C:\OpenCV2.2\lib\opencv_imgproc220d.lib
instead of
C:\OpenCV2.2\lib\opencv_calib3d220.lib
C:\OpenCV2.2\lib\opencv_core220.lib
C:\OpenCV2.2\lib\opencv_features2d220.lib
C:\OpenCV2.2\lib\opencv_highgui220.lib
C:\OpenCV2.2\lib\opencv_imgproc220.lib
我想，可能是我的lib沒有添加，於是仔細看了一下之前的配置方法，發現幾乎所有的配置中，添加的lib都是：
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_core230d.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_highgui230d.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_video230d.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_ml230d.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_legacy230d.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_imgproc230d.lib
和
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_core230.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_highgui230.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_video230.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_ml230.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_legacy230.lib
F:\Softs\OpenCV2.3\build\x86\vc10\lib\opencv_imgproc230.lib
以上的只是常用lib，並不全，於是我找到自己電腦上的"...\opencv\vs2010\install\lib",發現這上面居然有26個，其中13個for debug，13個for release，而我們在上面只添加了6個for debug，6個for release，看來lib是針對性的添加，從而可以引用到相應的函數，按如上方法添加其它的lib即可。
所有的lib如下所示：
For Release
opencv_calib3d231.lib
opencv_contrib231.lib
opencv_core231.lib
opencv_features2d231.lib
opencv_flann231.lib
opencv_gpu231.lib
opencv_highgui231.lib
opencv_imgproc231.lib
opencv_legacy231.lib
opencv_ml231.lib
opencv_objdetect231.lib
opencv_ts231.lib
opencv_video231.lib
For Debug
opencv_calib3d231d.lib
opencv_contrib231d.lib
opencv_core231d.lib
opencv_features2d231d.lib
opencv_flann231d.lib
opencv_gpu231d.lib
opencv_highgui231d.lib
opencv_imgproc231d.lib
opencv_legacy231d.lib
opencv_ml231d.lib
opencv_objdetect231d.lib
opencv_ts231d.lib
opencv_video231d.lib