How to install on Win10 step by step

[ivanshilo]

I spent quite a lot of time to get it running. I am sharing here so somebody else would have less pain. Maybe copy this to the main project page later on?

I am on win 10, Intel 64bit, Nvidia GPU is available.
I recommend to use virtual environments in python!
I do not use conda.

You need:

• Visual Studio 2019 with C++ package installed. Could work with VS 2017, I did not try.
• python 3.7 (because torch 1.2.0 does not support higher version) python 3.7.9 is the last available for installation
• pip install opencv-contrib-python==3.4.2.17 because opencv-python does not contain SIFT algo. old story, no solution Beware! OpenCV 4 is NOT compatible with the code. See other people here asking questions regrading wrong numpy array dimensions.
• pip install torch==1.2.0+cu92 torchvision==0.4.0+cu92 -f https://download.pytorch.org/whl/torch_stable.html could also work for 1.2.0+cpu or 1.2.0. I did not try. Torch install
• download and un-pack pre-compiled opencv package from here - direct exe
• change in ngransac/setup.py file:

opencv_inc_dir = 'C:/my path to/opencv/build/include' # directory containing OpenCV header files
opencv_lib_dir = 'C:/my path to/opencv/build/x64/vc15/lib' # directory containing OpenCV library files

and also libraries=['opencv_world342'] because opencv by default is compiled as one 'world' library, not core, gui, etc...

setup(
	name='ngransac',
	ext_modules=[CppExtension(
		name='ngransac', 
		sources=['ngransac.cpp','thread_rand.cpp'],
		include_dirs=[opencv_inc_dir],
		library_dirs=[opencv_lib_dir],
		libraries=['opencv_world342'],
		extra_compile_args=['-fopenmp']
		)],		
	cmdclass={'build_ext': BuildExtension})

openmp flag will be ignored

I have used Visual Studio 2019 for compilation.

you say inside python virtual environment cd ngransac; python setup.py install
Setuptools of python by using cmake will take care of finding torch header and lib files (they are installed as part of python torch package, nothing to do extra), find available C++ compiler on your system and all default C++ environment paths as Visual Studio itself does. It should just work. In the end file similar to ngransac.cp37-win_amd64.pyd will be created and moved to Lib\site-packages\ngransac-0.0.0-py3.7-win-amd64.egg.

Almost done.
*.pyd is like a dll file. It has dependencies and you have to take care of them manually.

• copy opencv_world342.dll from C:/my path to/opencv/build/x64/vc15/bin to Lib\site-packages\ngransac-0.0.0-py3.7-win-amd64.egg\
• copy all dlls from Lib\site-packages\torch\lib\ to Lib\site-packages\ngransac-0.0.0-py3.7-win-amd64.egg\

Hint: use dependency walker on *.pyd file when in doubt. It will show which dll is missing.

Ready!
call import ngransac inside python. Should give no errors.
call ngransac_demo.py as a start point for investigating the project

[ebrach]

Thanks, this is very useful. Pinning this issue for visibility.