Problem with "SurfFeatureDetector" function

[Isaac]

Hi,

I have few days working with OpenCV, I started with OpenCV 2.1 and I made an object tracker with "cvMatchTemplate" function, but now I've changed to OpenCV 2.4.3 to use the "SurfFeatureDetector" function but I got this error:

main.cpp: In function ‘int main()’:

main.cpp:31:5: error: ‘SurfFeatureDetector’ was not declared in this scope

main.cpp:31:25: error: expected ‘;’ before ‘detector’

main.cpp:34:5: error: ‘detector’ was not declared in this scope

main.cpp:37:5: error: ‘SurfDescriptorExtractor’ was not declared in this scope

main.cpp:37:29: error: expected ‘;’ before ‘extractor’

main.cpp:40:5: error: ‘extractor’ was not declared in this scope

I found this web: "http://stackoverflow.com/questions/10813853/facing-error-with-compiling-opencv-code" and someone there suggested this:

Including the following

#"opencv2/features2d/features2d.hpp"
#"opencv2/highgui/highgui.hpp"
#"opencv2/core/core.hpp"
#"opencv2/legacy/legacy.hpp" (BruteForceMatcher is defined here!)

and linking against the following

#opencv_core.so
#opencv_flann.soo (if youre using the FLANN matcher)
#opencv_highgui.so
#opencv_features2d.so
#opencv_nonfree.so

I understand that in the first part is:

#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"

#include "opencv2/core/core.hpp"

#include "opencv2/legacy/legacy.hpp"

but in the other part I don't know how to add them. I tried to ask in that foro but I got problem with the subscription. I'll be thankful for any help.

Thanks.

[Isaac]

I just resolved the problem.

I had to add this includes:

#include <opencv2/nonfree/features2d.hpp>

#include <opencv2/nonfree/nonfree.hpp>

and this line in my code:

int main()

{

initModule_nonfree();//THIS LINE IS IMPORTANT 

        // My Code

}

Problem solved!!