OpenCV compilation script for python bundled with PhotoScan. Should work with any other Python (and with virtualenv). Tested on Ubuntu 16.04

ps_install_ocv.sh

# Configure path to photoscan:
PHOTOSCAN_PATH=<.../photoscan-pro>
PYTHON_PATH=${PHOTOSCAN_PATH}/python

OPENCV_VERSION=3.4.0
INSTALLATION_PATH=/opt/opencv-${OPENCV_VERSION}
sudo mkdir -p ${INSTALLATION_PATH}

# Install numpy (OpenCV requires it)
CPPFLAGS=-I${PYTHON_PATH}/include/python3.5m LDFLAGS=-L${PYTHON_PATH}/lib ${PYTHON_PATH}/bin/python3.5 -m pip install numpy==1.08

# # If you see error like "ImportError: cannot import name 'HTTPSHandler'" - you need to execute these lines and after that try to install numpy again:
#
# wget http://snapshot.debian.org/archive/debian/20110406T213352Z/pool/main/o/openssl098/libssl0.9.8_0.9.8o-7_amd64.deb
# sudo dpkg -i libssl0.9.8_0.9.8o-7_amd64.deb
# rm libssl0.9.8_0.9.8o-7_amd64.deb

wget https://github.com/opencv/opencv/archive/${OPENCV_VERSION}.zip
unzip ${OPENCV_VERSION}.zip
rm ${OPENCV_VERSION}.zip
cd opencv-${OPENCV_VERSION}

# # Alternatively you can get the hole git repository (this is slower):
# git clone https://github.com/opencv/opencv
# cd opencv
# git checkout tags/${OPENCV_VERSION}

mkdir build
cd build

sudo apt update
sudo apt install -y cmake

# Configure opencv build:
#
# You can compile opencv_contrib with this option:
#      -D OPENCV_EXTRA_MODULES_PATH=.../opencv_contrib/modules \
# If you have CUDA SDK installed - you can speedup compilation by disabling CUDA support:
#      -D WITH_CUDA=OFF \

cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D CMAKE_INSTALL_PREFIX=${INSTALLATION_PATH} \
      -D PYTHON3_EXECUTABLE=${PYTHON_PATH}/bin/python3.5 \
      ..
make -j8
# Installing OpenCV library w.r.t. INSTALLATION_PATH variable
sudo make install
cd ..

# Now you can cleanup build dir with:
# rm -rf build
# You can even cleanup opencv source code dir:
# cd ..
# rm -rf opencv-${OPENCV_VERSION}

# Add cv2 package to photoscan's bundled python
ln -s ${INSTALLATION_PATH}/lib/python3.5/site-packages/cv2.cpython-35m-x86_64-linux-gnu.so ${PYTHON_PATH}/lib/python3.5/site-packages/cv2.cpython-35m-x86_64-linux-gnu.so