## Test Adapter:
```bash
base64 --wrap=0 < whole_boards/boards_for_empty/board_1554285167.655788_rank_5.png | python3 adapter.py
```

## Build OpenCV
```bash
mkdir opencv && curl -L https://github.com/opencv/opencv/archive/4.1.0.tar.gz | tar -xzv --directory=opencv_contrib --strip-components=1
mkdir opencv_contrib && curl -L https://github.com/opencv/opencv_contrib/archive/4.1.0.tar.gz | tar -xzv --directory=opencv_contrib --strip-components=1

mkdir -p opencv/build
cd opencv/build

cmake -D CMAKE_BUILD_TYPE=Release -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules/ -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_ENABLE_NONFREE=ON -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=OFF ..
make -j $(nproc)

sudo make install
sudo ldconfig

python3 -c "import cv2; print(cv2.__version__)"
```