使用Opencv：BlobDetector时未定义的引用错误

Question

当我尝试使用opencv编译我的程序来检测blob时，我收到以下错误：

11:47:34 **** Incremental Build of configuration Debug for project testOpencv 
Info: Internal Builder is used for build
g++ "-IC:\\Development\\opencv\\build\\include" -O0 -g3 -Wall -c -fmessage-      length=0 -o "src\\testOpencv.o" "..\\src\\testOpencv.cpp" 
g++ "-LC:\\Development\\opencv\\MINGW\\x86\\bin" -o testOpencv.exe    "src\\testOpencv.o" -llibopencv_calib3d2410 -llibopencv_contrib2410 -  llibopencv_core2410 -llibopencv_flann2410 -llibopencv_gpu2410 -   llibopencv_highgui2410 -llibopencv_imgproc2410 -llibopencv_ml2410 -  llibopencv_legacy2410 -llibopencv_nonfree2410 -llibopencv_objdetect2410 -  llibopencv_ocl2410 -llibopencv_photo2410 -llibopencv_stitching2410 -  llibopencv_superres2410 -llibopencv_video2410 -llibopencv_videostab2410 -  lopencv_ffmpeg2410 -llibopencv_ml2410 
src\testOpencv.o: In function `main':
C:\Development\Workspace\testOpencv\Debug/../src/testOpencv.cpp:98: undefined     reference to `cv::SimpleBlobDetector::Params::Params()'
C:\Development\Workspace\testOpencv\Debug/../src/testOpencv.cpp:110: undefined reference to     `cv::SimpleBlobDetector::SimpleBlobDetector(cv::SimpleBlobDetector::Params const&)'
C:\Development\Workspace\testOpencv\Debug/../src/testOpencv.cpp:113:    undefined reference to `cv::FeatureDetector::detect(cv::Mat const&,   std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&, cv::Mat const&) const'
C:\Development\Workspace\testOpencv\Debug/../src/testOpencv.cpp:117: undefined reference to `cv::drawKeypoints(cv::Mat const&,   std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> > const&, cv::Mat&,   cv::Scalar_<double> const&, int)'
src\testOpencv.o: In function `ZN2cv18SimpleBlobDetectorD1Ev':
C:/Development/opencv/build/include/opencv2/features2d/features2d.hpp:615: undefined reference to `vtable for cv::SimpleBlobDetector'
C:/Development/opencv/build/include/opencv2/features2d/features2d.hpp:615:undefined reference to `vtable for cv::SimpleBlobDetector'
C:/Development/opencv/build/include/opencv2/features2d/features2d.hpp:615:undefined reference to `VTT for cv::SimpleBlobDetector'
C:/Development/opencv/build/include/opencv2/features2d/features2d.hpp:615:    undefined reference to `cv::FeatureDetector::~FeatureDetector()'collect2.exe: error: ld returned 1 exit status

11:47:38 Build Finished (took 4s.111ms) >

我正在Eclipse中编译，Windows 7 - 64位，我尝试按照相反的顺序包含库，如此链接 - OpenCV undefined references。 以下是我的包含文件 -

#include "opencv2/calib3d/calib3d.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv/cv.h"
#include "opencv/highgui.h"
#include <iostream>
string imageName("image/Picture7.jpg");
if( argc > 1)
{
    imageName = argv[1];
}

Mat image,grey_image, src;
src = imread("image/lena512color.jpg");

image = imread(imageName.c_str(), IMREAD_COLOR);

//resizing to make it a normal size
resize(image, image, src.size());

namedWindow( "Display window", WINDOW_AUTOSIZE ); 
imshow( "Display window", image ); 
// to display the image in greyscale
cvtColor(image, grey_image, CV_RGB2GRAY);//CV_BGR2GRAY);
imwrite( "savedImage/Gray_image.jpg", grey_image );
namedWindow("Gray window", WINDOW_AUTOSIZE);
imshow("Gray window", grey_image);
// Reduce the noise so we avoid false circle detection
GaussianBlur( grey_image, grey_image, Size(9, 9), 2, 2 );
SimpleBlobDetector::Params params;
 params.maxThreshold= 200;
 params.minThreshold = 10;
 params.filterByArea= true;
 params.minArea = 1500;
 params.filterByCircularity= true;
 params.minCircularity = 0.1;
 params.filterByConvexity= true;
 params.minConvexity = 0.87;
 params.filterByInertia= true;
 params.minInertiaRatio= 0.01;

 SimpleBlobDetector detector(params);

 vector<KeyPoint> keypoints;
 detector.detect(grey_image, keypoints);

 //Draw detected blobs as red circles
 Mat blob_circles;
 drawKeypoints(grey_image, keypoints, blob_circles,Scalar(0,0,255), DrawMatchesFlags:: DRAW_RICH_KEYPOINTS);
 imshow("Keypoints", blob_circles);

waitKey(0);
return 0;
}

如何避免这些错误？

Answer 1

在您的链接器选项中：根据#include <windows.h> class Foo { public : Foo() { Connect(); } virtual ~Foo() { Disconnect(); } protected: static Foo* current_foo; static BOOL CtrlHandler(DWORD fdwCtrlType) { switch (fdwCtrlType) { // Handle the CTRL-C signal. case CTRL_C_EVENT: current_foo->Disconnect(); return(TRUE); default: return FALSE; } } Run() { Foo::current_foo = this; SetConsoleCtrlHandler( (PHANDLER_ROUTINE) CtrlHandler, TRUE ); // Other things } Connect(); Disconnect(); }; Foo* Foo::current_foo = nullptr; int main(int argc, char* argv[]) { Foo myFoo; myFoo.Run(); } 版本的名称添加-llibopencv_feature2d2410.lib，-llibopencv_objdetect2410.lib。

lib的路径似乎还不行：

opencv应为"-LC:\\Development\\opencv\\MINGW\\x86\\bin"