#0 0x00007ffff5bb325a in PyErr_Occurred ()
from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#1 0x00007fffcd77c237 in ?? ()
from /usr/local/lib/python2.7/dist-packages/numpy/core/multiarray.so
#2 0x00007fffcd72f04e in ?? ()
from /usr/local/lib/python2.7/dist-packages/numpy/core/multiarray.so
#3 0x00000000007000ff in NumpyAllocator::deallocate (
this=0xac33f8 <g_numpyAllocator>, refcount=0x7fff461b08a0)

I've got that Issue after typing make I have the newest version of g++

Hi! I've been getting the following error after running make and make test:

ImportError: ./examples.so: undefined symbol: _ZNK5boost6python7objects21py_function_impl_base9max_arityEv

Some info about my configuration:
Ubuntu 12.04
g++ 4.6.3
Python 2.7.3
boost 1.48

Fixed it by changing the lines 20-22 in the Make file into:
$(TARGET).so: $(TARGET).o conversion.o
$(CXX) -shared -Wl,-soname,$(TARGET).so $(TARGET).o conversion.o -o $(TARGET).so $(LDFLAGS)
$(OPENCV_LDFLAGS) $(OPENCV_LIBS) $(BOOST_LIBS) $(PYTHON_LIBS) \

(Following the answer from http://stackoverflow.com/questions/1780003/import-error-on-boost-python-hello-program)

Maybe it helps someone, thanks for sharing the code!

Best,
Petar

Any idea how to tweak your code to handle grayscale images? Currently I get a "MemoryError" if I pass one.

I'm getting the following error during make:

ld: can't map file, errno=22 file '/usr/local/Cellar/opencv/2.4.9/lib/' for architecture x86_64

To even get that far I had to edit the Makefile: https://gist.github.com/mike-lawrence/b1da52cdba1521014cc3

Any idea what's up?

Hi , I am trying to create test.c and test.h by converting test.py to test.pyx . So that i can use conversion.cpp and conversion.h in my function .
I tried in anaconda prompt to run the command "-m test" in python shell. But i am not able to run the make file . Can you please help me/ or tell me the steps to generate test.c and test.
Thanks in advance

Hi , I come across 2 problems,

1. rgb image could not be convert from python to opencv.

Yet when then image is gray , it works:

import cv2
img=cv2.imread("img.png");

import myLib#my libs as  follows 
cv3=myLib.cv3()
cv3.show(img,"imageTitle") 

But rgb image fails.
Yet, it seems that export from opencv to python works even if image is RGB:

imgExport=cv3.getSrcImage()

2. cv::Mat could not be reconginzed in python

error was reoport that Mat could not be reconginzed every time when I call :

cv3.srcImage

would you please give some direction on how to slove them ? Bellow is part of CPP code.

class cv3 {
    public: 
    cv::Mat srcImage;

    void loadImage(const char* srcPath  ){
        srcImage =cv::imread(srcPath ); 
    } 

    void getSrcImage(){
        return srcImage ;
    }

    void show(const cv::Mat& img, std::string title ="showImage"){
        cv::imshow(title,img);
        cv::waitKey(0);
        cv::destroyWindow(title);
    } 
}   




// Wrap a few functions and classes for testing purposes
namespace fs { namespace python {


    BOOST_PYTHON_MODULE(cv3)
    {
        // Main types export
        fs::python::init_and_export_converters();
        py::scope scope = py::scope(); 



    py::class_<cv3>("cv3")   
    .add_property("srcImage", & cv3::srcImage,& cv3::srcImage,  "srcImage")
         .def("loadImage", &cv3::loadImage)
         .def("getSrcImage", &cv3::getSrcImage) 

         .def("show", &cv3::show,( py::arg("img"),py::arg("title")= std::string("showImage")  )  ) 
          ;

    }

  } // namespace python
} // namespace fs

Basically i get the following error:

`conversion.cpp: In member function ‘cv::Mat NDArrayConverter::toMat(const PyObject*)’:
conversion.cpp:202:11: error: ‘class cv::Mat’ has no member named ‘refcount’
m.refcount = refcountFromPyObject(o);
^
conversion.cpp: In member function ‘PyObject* NDArrayConverter::toNDArray(const cv::Mat&)’:
conversion.cpp:223:12: error: ‘class cv::Mat’ has no member named ‘refcount’
if(!p->refcount || p->allocator != &g_numpyAllocator)
^
conversion.cpp:230:36: error: ‘class cv::Mat’ has no member named ‘refcount’
return pyObjectFromRefcount(p->refcount);

`
Which is caused for the absence of refcount which needs an update to OpenCV 3.0

Hi, everyone:
I try to finish the conversion between python ndarray and C++ MAT. In details, I want to send the image (ndarray) to C++ function arguments (MAT) and get the results (MAT) return to python (ndarray). Like this problem :
http://stackoverflow.com/questions/22667093/how-to-convert-the-numpy-ndarray-to-a-cvmat-using-python-c-api.
Can anyone help me?
Thanks a lot!

the opencv-numpy convertion not working in the other thread that create outside the main thread

NumPy supports Python 3.2 and above. Most of the code should work as is.

For platform and Python version dependent issues, it will be nice to move to a better build system from the current simple Makefile. Candidates are:

• Cmake (cross-platform, but the user needs to install this)
• Scons (same as above; nicer syntax [Python])
• GNU Autoconf (Available on almost all *nix systems)

I got this error when i added converion.h as a header file.
any help would be appreciated

I fixed the compiler now I am able to use the command -std=c++11, but I've got that error

After I had cloned your repository, I ran 'make' and everything was fine - no errors.
But for 'make test', I get the following output:-

env python2 -m test
Traceback (most recent call last):
File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
"main", fname, loader, pkg_name)
File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/home/prassanna/Development/workspace/opencv-ndarray-conversion/test.py", line 7, in
raise ImportError('Could not import the examples module. Did you run make?')
ImportError: Could not import the examples module. Did you run make?
make: *** [test] Error 1

My earlier make output is here : https://gist.github.com/4338f288aec0cabe2b2a.git