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在以前版本中,surf和sift算法都是在头文件#include <opencv2/features2d/features2d.hpp>中,但在新的opencv版本出来后,如果仍然使用这个头文件就会出现编译错误如下:
- 1> interestPoints.cpp
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(135): error C2039: 'SurfFeatureDetector' : is not a member of 'cv'
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(135): error C2065: 'SurfFeatureDetector' : undeclared identifier
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(135): error C2146: syntax error : missing ';' before identifier 'surf'
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(135): error C3861: 'surf': identifier not found
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(137): error C2065: 'surf' : undeclared identifier
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(137): error C2228: left of '.detect' must have class/struct/union
- 1> type is ''unknown-type''
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(151): error C2039: 'SiftFeatureDetector' : is not a member of 'cv'
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(151): error C2065: 'SiftFeatureDetector' : undeclared identifier
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(151): error C2146: syntax error : missing ';' before identifier 'sift'
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(151): error C3861: 'sift': identifier not found
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(157): error C2065: 'sift' : undeclared identifier
- 1>d:\visual studio 2010\exercises\opencv2\myinterestpoints\interestpoints.cpp(157): error C2228: left of '.detect' must have class/struct/union
- 1> type is ''unknown-type''
- 1>
- 1>Build FAILED.
产生错误的原因就是 sift 和 surf算法已经写到#include <opencv2/nonfree/features2d.hpp>中,所以需要把头文件替换一下, 然后又回出现错误:
- 1> All outputs are up-to-date.
- 1>interestPoints.obj : error LNK2019: unresolved external symbol "public: __thiscall cv::SIFT::SIFT(int,int,double,double,double)" (??0SIFT@cv@@QAE@HHNNN@Z) referenced in function _main
- 1>interestPoints.obj : error LNK2019: unresolved external symbol "public: __thiscall cv::SURF::SURF(double,int,int,bool,bool)" (??0SURF@cv@@QAE@NHH_N0@Z) referenced in function _main
- 1>D:\visual studio 2010\Exercises\opencv2\MyInterestPoints\Debug\MyInterestPoints.exe : fatal error LNK1120: 2 unresolved externals
所以继续排查原因,知道原来没有把 opencv_nonfree244d.lib 加入lib库中。
添加方法: View -》 Project Manager,
在Property Manager窗口中,右键Debug|Win32,选择Properties,
Linker -》 Input -》 Additional Dependencies -》edit
添加opencv_nonfree244d.lib -》 确定 即可
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