Converting numpy.ndarray into opencv cv::Mat

Question

I have Boost-Python interface for C++ OpenCv. I am getting this error when I invoke a C++ method from python:

Boost.Python.ArgumentError: Python argument types in
    Vision.process(Vision, numpy.ndarray, numpy.ndarray)
did not match C++ signature:
    process(python::vision::PythonVision {lvalue}, cv::Mat {lvalue}, cv::Mat {lvalue})

I am using python cv2.so module. How do I convert numpy.ndarray into cv::mat?

No idea, but there's any reason why you're not using official bindings? — Miki
– Miki, Commented Jan 16, 2016 at 20:21
I am using C++ openCV to build an android library. I built python bindings to interface with C++ code for fast prototyping. Thanks. — ssk
– ssk, Commented Jan 16, 2016 at 20:23

ssk · Accepted Answer · 2016-01-19 02:49:36Z

1

I used the following project:https://github.com/Algomorph/pyboostcvconverter and statically linked to it.

Note (To avoid segmentation fault):

1) PY_ARRAY_UNIQUE_SYMBOL should be defined where import_array is invoked In other places where is included, use NO_IMPORT_ARRAY

#define PY_ARRAY_UNIQUE_SYMBOL PYVISION_ARRAY_API
#include <pyboostcvconverter/pyboostcvconverter.hpp>

2) Invoke init_ar from the BOOST_PYTHON_MODULE

/**
 * @brief Initialize Numpy Array
 */
static void init_ar( )
{
    // initialize
    Py_Initialize();

    // defined in numpy
    import_array();
}

answered Jan 19, 2016 at 2:49

ssk

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