• class NDArrayConverter: The converter class

• NDArrayConverter::NDArrayConverter(): Constructor

• cv::Mat NDArrayConverter::toMat(const PyObject* o): Convert a NumPy ndarray to a cv::Mat.

  • o is the object representing the Python representation of the ndarray.

  • Returns a cv::Mat which is the OpenCV representation of o.

• PyObject* NDArrayConverter::toNDArray(const cv::Mat& mat): Convert a cv::Mat to a NumPy ndarray.

  • mat is the cv::Mat to convert.

  • Returns a PyObject* that is the Python representation of an ndarray.

matrmul.cpp contains an implementation of matrix multiplication that is callable from Python. It takes two ndarrays, converts both to cv::Mat using NDArrayConverter, multiplies these two Mats using cv::Mat::operator*, converts the result of multiplication back to an ndarray and returns this result to Python. The plumbing(passing of values to and from Python) is handled by Boost::Python.

After installing Boost::Python and NumPy(maybe the devel package),

$ make
$ make test

This will build an object file usable in other projects, conversion.o and run tests from test.py, which actually uses the compiled matrmul.so Python module to test matrix multiplication.