Send cv::Mat from c++ to python

edit

Hi I have created a c++ code that reads GIGE camera image using its sdk and converted it into cv::Mat. Now I have wrapped this code to use it in python but i dont know how to return Mat object to python.

PyObject* some_function(PyObject* self, PyObject* args)

{ //GIGE SDK gets image to hcamera3 object //***OPENCV PART******** // do image processing std::cout << "Acquired image...\n";

    CvSize size;
    size.width = ImageWidth(hCamera3);
    size.height = ImageHeight(hCamera3);

    retval = cvCreateImageHeader(size, ocv_depth(ImageDatatype(hCamera3, 0)), ImageDimension(hCamera3));

    ppixels = nullptr;

    GetLinearAccess(hCamera3, 0, &ppixels, &xInc, &yInc);
    cvSetData(retval, ppixels, yInc);
    //matToReturn = cv::cvarrToMat(retval, true);

    matToReturn = cv::cvarrToMat(retval, true);
    std::cout << matToReturn.size << "SIZE" << std::endl;;
    cv::imwrite("E:/PythonGenie.bmp", matToReturn);

    //******************************************************
    // stop the grab (kill = true: wait for ongoing frame acquisition to stop)
    result = G2Freeze(hCamera3, true);

    // free camera
    ReleaseObject(hCamera3);
}


return ?????????????????????

}

I am not sure what to put into return ?? and then how assign it in python. In java it was just passin a Mat object to c++ but here I am lost.

Any help appriciated!