cv2 cuda colab

cv2. ipynb

!git clone https://github.com/opencv/opencv
!git clone https://github.com/opencv/opencv_contrib
!mkdir /content/build
%cd /content/build

!cmake -DOPENCV_EXTRA_MODULES_PATH=/content/opencv_contrib/modules  \
       -DBUILD_SHARED_LIBS=OFF \
       -DBUILD_TESTS=OFF \
       -DBUILD_PERF_TESTS=OFF \
       -DBUILD_EXAMPLES=OFF \
       -DWITH_OPENEXR=OFF \
       -DWITH_CUDA=ON \
       -DWITH_CUBLAS=ON \
       -DWITH_CUDNN=ON \
       -DOPENCV_DNN_CUDA=ON \
       /content/opencv

!make -j8 install

## the new cv2.so is now in /content/build/lib/python3/
## you are not allowed a normal install on colab, (not root)
## but you can copy it into your work folder and restart the runtime, so it forgets about the old version !

import cv2
cv2.__version__

!ls -l

## save for later use:
!cp  /content/build/lib/python3/cv2.cpython-37m-x86_64-linux-gnu.so   "/content/drive/My Drive/cv2_cuda"

## next time, load it into your work folder:
## dont forget to restart the runtime, so it forgets about the old version !
!cp "/content/drive/My Drive/cv2_cuda/cv2.cpython-37m-x86_64-linux-gnu.so" .