pyopencv_from crash while calling Py_INCREF (opencv 4.1.2 python binding with cv2.cpp) #3
Description
Hello,
I am doing a python binding for a function that returns opencv mat object. so I used pyopencv_from for that as below:
static PyObject *method_convertLeaf2Mat(PyObject *self, PyObject *args) {
/* inner details....*/
const cv::Mat& m = i_leaf->getCvMat(cmd_context);
return pyopencv_from(m);
}
But when pyopencv_from is called, the program crashes. If I remove "Py_INCREF(o);" part from pyopencv_from function then I got following result:
>>> x = mod_imgproc.convertLeaf2Mat(a)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
SystemError: <built-in function convertLeaf2Mat> returned NULL without setting an error
Here is the pyopencv_from function definition:
template<>
PyObject* pyopencv_from(const Mat& m)
{
if( !m.data )
Py_RETURN_NONE;
Mat temp, *p = (Mat*)&m;
if(!p->u || p->allocator != &g_numpyAllocator)
{
temp.allocator = &g_numpyAllocator;
ERRWRAP2(m.copyTo(temp));
p = &temp;
}
PyObject* o = (PyObject*)p->u->userdata;
Py_INCREF(o);
return o;
}
I am using opencv 4.1.2. Which part could be wrong?
Thank you