c++ mat to numpy array

testing.cpp:参考：https://stackoverflow.com/questions/39110507/call-a-c-function-from-python-and-convert-a-opencv-mat-to-a-numpy-array

#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <boost/python.hpp>

using namespace cv;

int main(){}

Mat visualize(const cv::Mat input_image)
{
cv::Mat image;
image = input_image;

namedWindow("Display Image", WINDOW_AUTOSIZE );
imshow("Display Image", image);
waitKey(0);

return image;
}

using namespace boost::python;
BOOST_PYTHON_MODULE(testing) // file name
{
def("visualize", visualize); //function name
}

python_caller.py:

import cv2
import numpy as np
from testing import visualize

A = cv2.imread("imageL.jpg")

visualize(A)

Makefile:

CFLAGS=`pkg-config --cflags opencv`

LDFLAGS=`pkg-config --libs opencv`

testing.so: testing.o
g++ -shared -Wl,--export-dynamic -o testing.so testing.o -L/usr/lib -lboost_python -L/usr/lib/python2.7/config -lpython2.7 -L/usr/lib/x86_64-linux-gnu/ -lopencv_calib3d -lopencv_contrib -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_gpu -lopencv_highgui -lopencv_imgproc -lopencv_legacy -lopencv_ml -lopencv_objdetect -lopencv_ocl -lopencv_photo -lopencv_stitching -lopencv_superres -lopencv_ts -lopencv_video -lopencv_videostab

testing.o: testing.cpp
g++ -I/usr/include/python2.7 -I/usr/include -fPIC -c testing.cpp