How to convert a ndarray into opencv::Mat using Boost.Python?

Question

I am reading an image in Python and passing that numpy array to C++ using Boost.Python and receiving that in ndarray.

I need to convert the same into cv::Mat to perform operations in OpenCV C++.

How do I do that?

Answer 1

Finally I found the solution for that from the documentations:

We Have to receive the numpy array as numeric::array in C++ and have to do the following steps to easily convert the numpy into cv::mat efficiently.

void* img_arr = PyArray_DATA((PyObject*)arr.ptr());

And we need to pass this void ptr to the cv::Mat Constructor with other parameters required.

Mat image(rows, cols , CV_8UC3, img_arr);

1. int parameter: Expects the no. of rows
2. int parameter: Expects the no. of cols
3. Type parameter : Expects the type of image.
4. Void Pointer Parameter: Expects the image data.

And this resolves the problem!!!!.