README-opencv.md

Well, every time I look, opencv/fedora changes how things are packaged. The current state (Dec 04, 2018) is that we have to build ourselves from source code in order to get access to the SIFT functionality.

required

dnf install gtk3-devel libdc1394-devel libv4l-devel ffmpeg-devel gstreamer-plugins-base-devel

? gtk2-devel ?

optional

dnf install libpng-devel libjpeg-turbo-devel jasper-devel openexr-devel libtiff-devel libwebp-devel

also good to have

dnf install tbb-devel eigen3-devel doxygen

download the latest stable .tar.gz from here:

https://sourceforge.net/projects/opencvlibrary/files

extract

$ cd into source tree $ mkdir build $ cd build

contrib modules

$ git clone https://github.com/opencv/opencv_contrib.git $ cd opencv_contrib $ git checkout X.Y.Z (version matches the opencv version we are building)

cd back to opencv-opencv-blah-blah/build

$ cmake -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local -DWITH_TBB=ON -DWITH_EIGEN=ON -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules -DOPENCV_ENABLE_NONFREE=ON -DPYTHON_DEFAULT_EXECUTABLE=python3 ..

build it:

$ make -j4

install it:

$ sudo make install

make it accessible to yourself by adding this to your ~/.bashrc file:

and if you run [t]csh or something else you probably already know how to

do the equivalent in your own shell.

User specific aliases and functions

export PYTHONPATH=$PYTHONPATH:/usr/local/python/cv2/python-3.7