Excerpt from learnopencv modified to work with OpenCV 3.2
How to Convert your OpenCV C++ code Into a Python Module
mkdir ovex cd ovex mkdir src cp ../opencv-3.1.0/modules/python/src2/{pycompat.hpp,cv2.cpp,gen2.py,hdr_parser.py} ./ cp ../learnopencv-master/pymodule/src/* src/ cp ../learnopencv-master/pymodule/headers.txt ./
Prepare to use pycompat.hpp, cv2.cpp in opencv-3.1.0 source code,gen2.py, hdr_parser.py file, use the opencv c++ source file in the blog above, take your time
Modify gen2.py where you see # ARW 12/23/2020 In gen2.py do a global search an replace of "pyopencv2" with ${modulePrefix} In strings do "..."+ modulePrefix +"..." All invocations of substitute() have the following for the first argument .substitute(modulePrefix=modulePrefix, ... Console commands from root directory (where headers.txt is)
mkdir build ./gen2.py build ./headers.txt
Modify the cv2.cpp file define macros #define PYOPENCV_TO pybv_to #define PYOPENCV_FROM pybv_from Global replace pyopencv_to -> PYOPENCV_TO Global replace pyopencv_from -> PYOPENCV_FROM change the #include files to reference your files in the build folder fix the MKTYPE2(NAME) macros and substitute your module name
mkdir build
python3 gen2.py build headers.txt
g++ -shared -rdynamic -g -O3 -Wall -Wno-unused-function -Wno-unused-variable -fPIC cv3.cpp src/bvmodule.cpp -DMODULE_STR=bv -DMODULE_PREFIX=pybv -DNDEBUG -DPY_MAJOR_VERSION=3 pkg-config --cflags --libs opencv python3-config --includes --ldflags -I . -I/usr/lib/python3/dist-packages/numpy/core/include -I build -L/usr/bin/python3-config --exec-prefix/lib -o bv.so
python3
import bv
dir(bv)
mkdir build
python2.7 gen2.py build headers.txt
g++ -shared -rdynamic -g -O3 -Wall -Wno-unused-function -Wno-unused-variable -fPIC cv3.cpp src/bvmodule.cpp -DMODULE_STR=bv -DMODULE_PREFIX=pybv -DNDEBUG -DPY_MAJOR_VERSION=2 pkg-config --cflags --libs opencv python2.7-config --includes --ldflags -I . -I/usr/lib/python2.7/dist-packages/numpy/core/include -I build -L/usr/bin/python2.7-config --exec-prefix/lib -o bv.so
python2.7
import bv
dir(bv)