Sample from modules/reg/samples/map_test.cpp does not compile

[albenoit]

Hi Kiril,

Sorry if i assigned the issue to you but the author Alfonso (alfonsosanchezbeato ) does not appear in the assignies list.

this sample does not compile.

First, you should change your includes referring to opencv modules
For example: replace

#include <opencv2/highgui/highgui.hpp>
by
#include <opencv2/highgui.hpp> // but note that teire are two similar lines including highgui

Here is the compiler errors i have with the original submission

[ 75%] Built target opencv_reg
Scanning dependencies of target example_reg_map_test
[ 75%] Building CXX object modules/reg/CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o
In file included from /home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:43:0:
/home/noob/install/OpenCV/github/opencv/modules/highgui/include/opencv2/highgui/highgui.hpp:45:2: error: #error this is a compatibility header which should not be used inside the OpenCV library
 #error this is a compatibility header which should not be used inside the OpenCV library
  ^
In file included from /home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:44:0:
/home/noob/install/OpenCV/github/opencv/modules/imgproc/include/opencv2/imgproc/imgproc.hpp:45:2: error: #error this is a compatibility header which should not be used inside the OpenCV library
 #error this is a compatibility header which should not be used inside the OpenCV library
  ^
In file included from /home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:45:0:
/usr/local/include/opencv2/features2d/features2d.hpp:45:2: error: #error this is a compatibility header which should not be used inside the OpenCV library
 #error this is a compatibility header which should not be used inside the OpenCV library
  ^
In file included from /home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:46:0:
/usr/local/include/opencv2/nonfree/nonfree.hpp:45:2: error: #error this is a compatibility header which should not be used inside the OpenCV library
 #error this is a compatibility header which should not be used inside the OpenCV library
  ^
In file included from /home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:47:0:
/usr/local/include/opencv2/calib3d/calib3d.hpp:45:2: error: #error this is a compatibility header which should not be used inside the OpenCV library
 #error this is a compatibility header which should not be used inside the OpenCV library
  ^
In file included from /home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:48:0:
/home/noob/install/OpenCV/github/opencv/modules/imgproc/include/opencv2/imgproc/imgproc.hpp:45:2: error: #error this is a compatibility header which should not be used inside the OpenCV library
 #error this is a compatibility header which should not be used inside the OpenCV library
  ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void showDifference(const cv::Mat&, const cv::Mat&, const char*)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:68:6: warning: no previous declaration for ‘void showDifference(const cv::Mat&, const cv::Mat&, const char*)’ [-Wmissing-declarations]
 void showDifference(const Mat& image1, const Mat& image2, const char* title)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testShift(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:89:6: warning: no previous declaration for ‘void testShift(const cv::Mat&)’ [-Wmissing-declarations]
 void testShift(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testEuclidean(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:121:6: warning: no previous declaration for ‘void testEuclidean(const cv::Mat&)’ [-Wmissing-declarations]
 void testEuclidean(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testSimilarity(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:159:6: warning: no previous declaration for ‘void testSimilarity(const cv::Mat&)’ [-Wmissing-declarations]
 void testSimilarity(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testAffine(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:198:6: warning: no previous declaration for ‘void testAffine(const cv::Mat&)’ [-Wmissing-declarations]
 void testAffine(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testProjective(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:233:6: warning: no previous declaration for ‘void testProjective(const cv::Mat&)’ [-Wmissing-declarations]
 void testProjective(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void calcHomographyFeature(const cv::Mat&, const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:270:6: warning: no previous declaration for ‘void calcHomographyFeature(const cv::Mat&, const cv::Mat&)’ [-Wmissing-declarations]
 void calcHomographyFeature(const Mat& image1, const Mat& image2)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void calcHomographyPixel(const cv::Mat&, const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:352:6: warning: no previous declaration for ‘void calcHomographyPixel(const cv::Mat&, const cv::Mat&)’ [-Wmissing-declarations]
 void calcHomographyPixel(const Mat& img1, const Mat& img2)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void comparePixelVsFeature(const cv::Mat&, const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:373:6: warning: no previous declaration for ‘void comparePixelVsFeature(const cv::Mat&, const cv::Mat&)’ [-Wmissing-declarations]
 void comparePixelVsFeature(const Mat& img1_8b, const Mat& img2_8b)
      ^
make[2]: *** [modules/reg/CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o] Erreur 1
make[1]: *** [modules/reg/CMakeFiles/example_reg_map_test.dir/all] Erreur 2
make: *** [all] Erreur 2

Now, if i correct the includes

I got these problems : code warnings and liker error (you should specifiy which module to link to in the config files)

Scanning dependencies of target example_reg_map_test
[ 75%] Building CXX object modules/reg/CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void showDifference(const cv::Mat&, const cv::Mat&, const char*)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:68:6: warning: no previous declaration for ‘void showDifference(const cv::Mat&, const cv::Mat&, const char*)’ [-Wmissing-declarations]
 void showDifference(const Mat& image1, const Mat& image2, const char* title)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testShift(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:89:6: warning: no previous declaration for ‘void testShift(const cv::Mat&)’ [-Wmissing-declarations]
 void testShift(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testEuclidean(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:121:6: warning: no previous declaration for ‘void testEuclidean(const cv::Mat&)’ [-Wmissing-declarations]
 void testEuclidean(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testSimilarity(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:159:6: warning: no previous declaration for ‘void testSimilarity(const cv::Mat&)’ [-Wmissing-declarations]
 void testSimilarity(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testAffine(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:198:6: warning: no previous declaration for ‘void testAffine(const cv::Mat&)’ [-Wmissing-declarations]
 void testAffine(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void testProjective(const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:233:6: warning: no previous declaration for ‘void testProjective(const cv::Mat&)’ [-Wmissing-declarations]
 void testProjective(const Mat& img1)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void calcHomographyFeature(const cv::Mat&, const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:270:6: warning: no previous declaration for ‘void calcHomographyFeature(const cv::Mat&, const cv::Mat&)’ [-Wmissing-declarations]
 void calcHomographyFeature(const Mat& image1, const Mat& image2)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void calcHomographyPixel(const cv::Mat&, const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:352:6: warning: no previous declaration for ‘void calcHomographyPixel(const cv::Mat&, const cv::Mat&)’ [-Wmissing-declarations]
 void calcHomographyPixel(const Mat& img1, const Mat& img2)
      ^
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp: In function ‘void comparePixelVsFeature(const cv::Mat&, const cv::Mat&)’:
/home/noob/install/OpenCV/github/opencv_contrib/modules/reg/samples/map_test.cpp:373:6: warning: no previous declaration for ‘void comparePixelVsFeature(const cv::Mat&, const cv::Mat&)’ [-Wmissing-declarations]
 void comparePixelVsFeature(const Mat& img1_8b, const Mat& img2_8b)
      ^
Linking CXX executable ../../bin/example_reg_map_test
CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o: dans la fonction « calcHomographyFeature(cv::Mat const&, cv::Mat const&) »:
map_test.cpp:(.text+0x72f9): référence indéfinie vers « cv::SURF::SURF(double, int, int, bool, bool) »
map_test.cpp:(.text+0x7396): référence indéfinie vers « cv::FeatureDetector::detect(cv::_InputArray const&, std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&, cv::_InputArray const&) const »
map_test.cpp:(.text+0x73f3): référence indéfinie vers « cv::FeatureDetector::detect(cv::_InputArray const&, std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&, cv::_InputArray const&) const »
map_test.cpp:(.text+0x7400): référence indéfinie vers « cv::SURF::SURF() »
map_test.cpp:(.text+0x7592): référence indéfinie vers « cv::Feature2D::compute(cv::_InputArray const&, std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&, cv::_OutputArray const&) const »
map_test.cpp:(.text+0x762c): référence indéfinie vers « cv::Feature2D::compute(cv::_InputArray const&, std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&, cv::_OutputArray const&) const »
map_test.cpp:(.text+0x764f): référence indéfinie vers « cv::flann::SearchParams::SearchParams(int, float, bool) »
map_test.cpp:(.text+0x7698): référence indéfinie vers « cv::flann::KDTreeIndexParams::KDTreeIndexParams(int) »
map_test.cpp:(.text+0x76e6): référence indéfinie vers « cv::FlannBasedMatcher::FlannBasedMatcher(cv::Ptr<cv::flann::IndexParams> const&, cv::Ptr<cv::flann::SearchParams> const&) »
map_test.cpp:(.text+0x77e9): référence indéfinie vers « cv::DescriptorMatcher::match(cv::_InputArray const&, cv::_InputArray const&, std::vector<cv::DMatch, std::allocator<cv::DMatch> >&, cv::_InputArray const&) const »
map_test.cpp:(.text+0x7e6e): référence indéfinie vers « cv::findHomography(cv::_InputArray const&, cv::_InputArray const&, int, double, cv::_OutputArray const&) »
map_test.cpp:(.text+0x87df): référence indéfinie vers « vtable for cv::FlannBasedMatcher »
map_test.cpp:(.text+0x87e8): référence indéfinie vers « cv::DescriptorMatcher::DescriptorCollection::~DescriptorCollection() »
map_test.cpp:(.text+0x8885): référence indéfinie vers « cv::DescriptorMatcher::~DescriptorMatcher() »
map_test.cpp:(.text+0x8984): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x898b): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x8990): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x8997): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x89c4): référence indéfinie vers « cv::DescriptorExtractor::~DescriptorExtractor() »
map_test.cpp:(.text+0x89d1): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x89d6): référence indéfinie vers « cv::FeatureDetector::~FeatureDetector() »
map_test.cpp:(.text+0x8a18): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x8a39): référence indéfinie vers « cv::DescriptorExtractor::~DescriptorExtractor() »
map_test.cpp:(.text+0x8a46): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x8a4b): référence indéfinie vers « cv::FeatureDetector::~FeatureDetector() »
map_test.cpp:(.text+0x8d24): référence indéfinie vers « cv::DescriptorMatcher::~DescriptorMatcher() »
map_test.cpp:(.text+0x8ec4): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x8ecc): référence indéfinie vers « cv::FeatureDetector::~FeatureDetector() »
map_test.cpp:(.text+0x8fe2): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text+0x8fea): référence indéfinie vers « cv::FeatureDetector::~FeatureDetector() »
CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o: dans la fonction « cv::SURF::~SURF() »:
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x2): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x15): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x1c): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x30): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x38): référence indéfinie vers « cv::DescriptorExtractor::~DescriptorExtractor() »
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x3d): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x45): référence indéfinie vers « cv::FeatureDetector::~FeatureDetector() »
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x5b): référence indéfinie vers « VTT for cv::SURF »
map_test.cpp:(.text._ZN2cv4SURFD1Ev[_ZN2cv4SURFD1Ev]+0x66): référence indéfinie vers « cv::FeatureDetector::~FeatureDetector() »
CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o: dans la fonction « cv::detail::PtrOwnerImpl<cv::flann::SearchParams, cv::DefaultDeleter<cv::flann::SearchParams> >::deleteSelf() »:
map_test.cpp:(.text._ZN2cv6detail12PtrOwnerImplINS_5flann12SearchParamsENS_14DefaultDeleterIS3_EEE10deleteSelfEv[_ZN2cv6detail12PtrOwnerImplINS_5flann12SearchParamsENS_14DefaultDeleterIS3_EEE10deleteSelfEv]+0x16): référence indéfinie vers « cv::flann::IndexParams::~IndexParams() »
CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o: dans la fonction « cv::detail::PtrOwnerImpl<cv::flann::KDTreeIndexParams, cv::DefaultDeleter<cv::flann::KDTreeIndexParams> >::deleteSelf() »:
map_test.cpp:(.text._ZN2cv6detail12PtrOwnerImplINS_5flann17KDTreeIndexParamsENS_14DefaultDeleterIS3_EEE10deleteSelfEv[_ZN2cv6detail12PtrOwnerImplINS_5flann17KDTreeIndexParamsENS_14DefaultDeleterIS3_EEE10deleteSelfEv]+0x16): référence indéfinie vers « cv::flann::IndexParams::~IndexParams() »
CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o: dans la fonction « cv::FlannBasedMatcher::~FlannBasedMatcher() »:
map_test.cpp:(.text._ZN2cv17FlannBasedMatcherD2Ev[_ZN2cv17FlannBasedMatcherD5Ev]+0x11): référence indéfinie vers « vtable for cv::FlannBasedMatcher »
map_test.cpp:(.text._ZN2cv17FlannBasedMatcherD2Ev[_ZN2cv17FlannBasedMatcherD5Ev]+0x16): référence indéfinie vers « cv::DescriptorMatcher::DescriptorCollection::~DescriptorCollection() »
map_test.cpp:(.text._ZN2cv17FlannBasedMatcherD2Ev[_ZN2cv17FlannBasedMatcherD5Ev]+0xc2): référence indéfinie vers « cv::DescriptorMatcher::~DescriptorMatcher() »
map_test.cpp:(.text._ZN2cv17FlannBasedMatcherD2Ev[_ZN2cv17FlannBasedMatcherD5Ev]+0x84): référence indéfinie vers « cv::DescriptorMatcher::~DescriptorMatcher() »
CMakeFiles/example_reg_map_test.dir/samples/map_test.cpp.o: dans la fonction « cv::FlannBasedMatcher::~FlannBasedMatcher() »:
map_test.cpp:(.text._ZN2cv17FlannBasedMatcherD0Ev[_ZN2cv17FlannBasedMatcherD0Ev]+0x11): référence indéfinie vers « vtable for cv::FlannBasedMatcher »
map_test.cpp:(.text._ZN2cv17FlannBasedMatcherD0Ev[_ZN2cv17FlannBasedMatcherD0Ev]+0x16): référence indéfinie vers « cv::DescriptorMatcher::DescriptorCollection::~DescriptorCollection() »
map_test.cpp:(.text._ZN2cv17FlannBasedMatcherD0Ev[_ZN2cv17FlannBasedMatcherD0Ev]+0x7e): référence indéfinie vers « cv::DescriptorMatcher::~DescriptorMatcher() »
map_test.cpp:(.text._ZN2cv17FlannBasedMatcherD0Ev[_ZN2cv17FlannBasedMatcherD0Ev]+0xc2): référence indéfinie vers « cv::DescriptorMatcher::~DescriptorMatcher() »
collect2: error: ld returned 1 exit status
make[2]: *** [bin/example_reg_map_test] Erreur 1
make[1]: *** [modules/reg/CMakeFiles/example_reg_map_test.dir/all] Erreur 2
make: *** [all] Erreur 2

[kirill-korniakov]

@alfonsosanchezbeato, could you please have a look?

[alfonsosanchezbeato]

How are you compiling this? Using the cmake that appears in the folder works for me:

.../reg/samples $ mkdir obj; cd obj
.../reg/samples/obj $ export OpenCV_DIR=[openCV_out]
.../reg/samples/obj $ cmake ..
.../reg/samples/obj $ make

I am using gcc 4.8. Which is your set-up? It looks like you are compiling it inside the OpenCV library.

-- Alfonso

[albenoit]

Hi,

i am using gcc 4.8 on debian 64bit.
Actually, i just start global opencv build with opencv_contrib extra module.
Normally, all the proposed codes (libs, samples and tutorial) should
compile fine at opencv make (for samples, they are automatically built if
BUILD_EXAMPLES option is set to ON).

so yes i am compiling it inside the OpenCV library to build all at the same
time.
Regarding your code, the includes lines fails (you target wrong headers :
you should do

#include <opencv2/highgui.hpp>

instead of writing

#include <opencv2/highgui/highgui.hpp>

you are actually targeting a compatibility header which should not be
used inside the OpenCV library
(as the header says ;o) ).

Then, can you make it compile within the library during its own build ?

Thanks
Alex

2014-02-17 17:30 GMT+01:00 alfonsosanchezbeato [email protected]:

How are you compiling this? Using the cmake that appears in the folder
works for me:

.../reg/samples $ mkdir obj; cd obj
.../reg/samples $ export OpenCV_DIR=
.../reg/samples $ cmake ..
.../reg/samples $ make

I am using gcc 4.8. Which is your set-up? It looks like you are compiling
it inside the OpenCV library.

-- Alfonso

Reply to this email directly or view it on GitHubhttps://github.com//issues/11#issuecomment-35299744
.

Alexandre BENOIT,
Associate Professor / Maître de Conférence
Image processing and visual scene classification,
LISTIC Lab / IUT Annecy
https://sites.google.com/site/benoitalexandrevision/

[alfonsosanchezbeato]

Ok, I have been trying to compile changing header paths and with

$ cmake -DOPENCV_EXTRA_MODULES_PATH=/mnt/data/opencv/opencv_contrib/modules -DBUILD_EXAMPLES=ON [opencv_folder]

But I have lots of problems trying to use features2d. I tried adding:

ocv_add_module(opencv_nonfree opencv_features2d)

to CMakeLists.txt in reg/samples/ folder, but still it does not find features2d.hpp header. Any hint on this?

Thanks,
Alfonso

[albenoit]

Normally, in your code, features2d include should be :

#include "opencv2/nonfree.hpp" // if you are using SIFT or SURF
or
#include "opencv2/features2d.hpp" // if you are using free descriptors

Is it the case ?

2014-02-18 11:49 GMT+01:00 alfonsosanchezbeato [email protected]:

Ok, I have been trying to compile changing header paths and with

$ cmake
-DOPENCV_EXTRA_MODULES_PATH=/mnt/data/opencv/opencv_contrib/modules
-DBUILD_EXAMPLES=ON [opencv_folder]

But I have lots of problems trying to use features2d. I tried adding:

ocv_add_module(opencv_nonfree opencv_features2d)

to CMakeLists.txt in reg/samples/ folder, but still it does not find
features2d.hpp header. Any hint on this?

Thanks,
Alfonso

Reply to this email directly or view it on GitHubhttps://github.com//issues/11#issuecomment-35372146
.

Alexandre BENOIT,
Associate Professor / Maître de Conférence
Image processing and visual scene classification,
LISTIC Lab / IUT Annecy
https://sites.google.com/site/benoitalexandrevision/

[alfonsosanchezbeato]

It does not find any of those headers, not if I compile all OpenCV it with BUILD_EXAMPLES set. If I use the CMakeLists.txt file as stand-alone, headers are found. The problem seems to happen only for non-free modules. opencv2/imgproc.hpp or opencv2/highgui.hpp are found compiling OpenCV + BUILD_EXAMPLES.