Compilation against OpenCV 2.4

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Compiling with OpenCV 2.4 installed

What is the expected output? What do you see instead?
It should be compiled. But These errors Occur:
/home/alireza/Tools/Codes/SLAM/OpenFabMap/openFabMap/samples/openFABMAPcli.cpp:5
71: error: ambiguous overload for ‘operator=’ in ‘confusion_mat = 0’
/usr/local/include/opencv2/core/mat.hpp:300: note: candidates are: cv::Mat& 
cv::Mat::operator=(const cv::Mat&)
/usr/local/include/opencv2/core/core.hpp:1714: note:                 cv::Mat& 
cv::Mat::operator=(const cv::Scalar&)
make[2]: *** [CMakeFiles/openFABMAPcli.dir/samples/openFABMAPcli.cpp.o] Error 1
make[1]: *** [CMakeFiles/openFABMAPcli.dir/all] Error 2

openFABMAPcli.cpp:(.text+0x4607): undefined reference to 
`cv::SURF::SURF(double, int, int, bool, bool)'
openFABMAPcli.cpp:(.text+0x48ff): undefined reference to `cv::SIFT::SIFT(int, 
int, double, double, double)'
CMakeFiles/openFABMAPcli.dir/samples/openFABMAPcli.cpp.o: In function 
`generateExtractor(cv::FileStorage&)':
openFABMAPcli.cpp:(.text+0x51ea): undefined reference to `cv::SIFT::SIFT(int, 
int, double, double, double)'
openFABMAPcli.cpp:(.text+0x54f0): undefined reference to 
`cv::SURF::SURF(double, int, int, bool, bool)'

What version of the product are you using? On what operating system?
2.0

Please provide any additional information below.
In openFABMAPcli.cpp:
Change
    cv::Mat confusion_mat(testImageDescs.rows, testImageDescs.rows, CV_64FC1 );
confusion_mat = 0; // init to 0's

to
    cv::Mat confusion_mat(testImageDescs.rows, testImageDescs.rows, CV_64FC1 , cv::Scalar::all(0));

Link against nonfree library
# Tell openFABMAPcli to link against its required libs
    TARGET_LINK_LIBRARIES(openFABMAPcli openFABMAP opencv_nonfree)

Original issue reported on code.google.com by a.norouz...@gmail.com on 29 Sep 2012 at 6:29

[GoogleCodeExporter]

Linking to the opencv_nonfree removes the undefined references

But it does not solve the "ambigious overload for ..."

Did you find a solution? 
Specifically
Ubuntu 12.10, opencv2.4.4

/home/mikael/packages/fabmap/fabmap/samples/openFABMAPcli.cpp: In function 
âint openFABMAP(std::string, of2::FabMap*, std::string, std::string, bool)â:
/home/mikael/packages/fabmap/fabmap/samples/openFABMAPcli.cpp:568:18: error: 
ambiguous overload for âoperator=â in âconfusion_mat = 0â
/home/mikael/packages/fabmap/fabmap/samples/openFABMAPcli.cpp:568:18: note: 
candidates are:
In file included from /usr/local/include/opencv2/core/core.hpp:4785:0,
                 from /usr/local/include/opencv2/opencv.hpp:47,
                 from /home/mikael/packages/fabmap/fabmap/samples/../include/openfabmap.hpp:38,
                 from /home/mikael/packages/fabmap/fabmap/samples/openFABMAPcli.cpp:30:
/usr/local/include/opencv2/core/mat.hpp:281:13: note: cv::Mat& 
cv::Mat::operator=(const cv::Mat&)
In file included from /usr/local/include/opencv2/opencv.hpp:47:0,
                 from /home/mikael/packages/fabmap/fabmap/samples/../include/openfabmap.hpp:38,
                 from /home/mikael/packages/fabmap/fabmap/samples/openFABMAPcli.cpp:30:
/usr/local/include/opencv2/core/core.hpp:1767:10: note: cv::Mat& 
cv::Mat::operator=(const Scalar&)
make[2]: *** [CMakeFiles/openFABMAPcli.dir/samples/openFABMAPcli.cpp.o] Error 1
make[1]: *** [CMakeFiles/openFABMAPcli.dir/all] Error 2
make: *** [all] Error 2

Original comment by Mikael.P...@gmail.com on 4 Apr 2013 at 7:50

[GoogleCodeExporter]

I got it working by changing 
confusion_mat = 0; // init to 0's
to
confusion_mat = cv::Mat::zeros(testImageDescs.rows, testImageDescs.rows, 
CV_64FC1);
in openFABMAPcli.cpp

Original comment by cyc3...@gmail.com on 13 Aug 2013 at 7:54