When I try to run the sample find_obj.cpp
or any OpenCV SURF program I get the following error in command prompt while executing the code. The project builds without errors and warnings. I am using VS2011 beta, OpenCV 2.4 and windows7.
Error message:
OpenCV Error: The function/feature is not implemented < OpenCV was built without SURF support> in unknown function,file ..\..\..\src\opencv\modules\legacy\src\features2d.cpp, line 77
I tried to build the OpenCV 2.4 again using Cmake and then VS2011 in debug mode and then added the lib paths in the IDE, but still no result.
How can I fix that?
#include <opencv2/objdetect/objdetect.hpp>
#include <opencv2/features2d/features2d.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/legacy/legacy.hpp>
#include <opencv2/legacy/compat.hpp>
#include <opencv2/flann/flann.hpp>
#include <opencv2/calib3d/calib3d.hpp>
#include <opencv2/nonfree/features2d.hpp>
#include <opencv2/nonfree/nonfree.hpp>
using namespace std;
using namespace cv;
int main()
{
cv::initModule_nonfree();//THIS LINE IS IMPORTANT
IplImage *image1 = cvLoadImage("C:\\SURF\\1.jpg");
IplImage *image2 = cvLoadImage("C:\\SURF\\2.jpg");
CvMemStorage* memoryBlock = cvCreateMemStorage();
CvSeq* image1KeyPoints;
CvSeq* image1Descriptors;
CvSeq* image2KeyPoints;
CvSeq* image2Descriptors;
// Only values with a hessian greater than 500 are considered for keypoints
CvSURFParams params = cvSURFParams(500, 1);
cvExtractSURF(image1, 0, &image1KeyPoints, &image1Descriptors, memoryBlock, params);
cvExtractSURF(image2, 0, &image2KeyPoints, &image2Descriptors, memoryBlock, params);
return 0;
}
Taken from this answer (why don't you google your question before asking?):
The SIFT and SURF code was moved in OpenCV v2.4 to a new module called
nonfree
. Make sure you are linking (DLL in Windlows) to it. In linux this library is called libopencv_nonfree.so
.