Chapter 4 compile problem ‘BruteForceMatcher_GPU’ was not declared in this scope

[wkyoun]

I am trying to compile chapter 4,
but following error occurs!

Would you please let me know how to fix it?

wkyoun@wkyoun-XPS-13-9343:~/code/Chapter4_StructureFromMotion/build$ make

Scanning dependencies of target ExploringSfMLibrary
[  7%] Building CXX object CMakeFiles/ExploringSfMLibrary.dir/GPUSURFFeatureMatcher.cpp.o
/home/wkyoun/code/Chapter4_StructureFromMotion/GPUSURFFeatureMatcher.cpp: In member     function ‘virtual void GPU
SURFFeatureMatcher::MatchFeatures(int, int, std::vector<cv::DMatch>*)’:
/home/wkyoun/code/Chapter4_StructureFromMotion/GPUSURFFeatureMatcher.cpp:77:5: error:     ‘BruteForceMatcher_GPU’ was not declared in this scope
     BruteForceMatcher_GPU<L2<float> > matcher;
     ^
/home/wkyoun/code/Chapter4_StructureFromMotion/GPUSURFFeatureMatcher.cpp:77:37: error:     expected primary-expression before ‘>’ token
     BruteForceMatcher_GPU<L2<float> > matcher;
                                 ^
/home/wkyoun/code/Chapter4_StructureFromMotion/GPUSURFFeatureMatcher.cpp:77:39: error:     ‘matcher’ was not declared in this scope
     BruteForceMatcher_GPU<L2<float> > matcher;
                                   ^
make[2]: *** [CMakeFiles/ExploringSfMLibrary.dir/GPUSURFFeatureMatcher.cpp.o] Error 1
make[1]: *** [CMakeFiles/ExploringSfMLibrary.dir/all] Error 2
make: *** [all] Error 2

[royshil]

@won13y I'm currently re-writing this chapter, getting ready for a 2nd edition of the book that's schedule to publish before the end of the year. This code will be replaced with a far more robust version.

[wkyoun]

@royshil Thank you for the reply
Before you publish 2nd edition,
Would you please let me know how to fix those problems?

I already bought your book which have excellent contents about Sfm,

and I really need to run the opencv example of Chapter 4 for my projects

If possible,
I would like to invite you to come my institution(KARI) in south korea in the future
to share you knowlegde, and really hope that we can collaborate each other!
(Main topic of our team is Visual-SLAM usnig mono-camera on drone(quadcopter))

[thbupt]

@won13y I have the same problem, have you solved it?

[wkyoun]

@thbupt No, I cannot solve the problem yet!

Would anyone of you please let me know how to fix it?

[thbupt]

@won13y I just solved this problem. Just include opencv2/nonfree/gpu.hpp in the GPUSURFFeatureMatcher.hpp. You can have a try.

[lothas]

For the sake of clarity, @thbupt 's solution requires adding opencv2/nonfree/gpu.hpp, in addition to opencv2/gpu/gpu.hpp.
That solved it for me.