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?

this might be of help stackoverflow.com/questions/22736593/…, github.com/yati-sagade/opencv-ndarray-conversion. — Eswar
– Eswar, Commented Oct 22, 2018 at 8:50

Milind Deore · Accepted Answer · 2019-08-07 08:20:34Z

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);

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

And this resolves the problem!!!!.

edited Aug 7, 2019 at 8:20

Milind Deore

3,0615 gold badges27 silver badges45 bronze badges

answered Oct 24, 2018 at 7:38

Harish Kumar Thirugnanam

132 silver badges6 bronze badges

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