Build OpenCV from sources in anaconda virtual envs with Cuda

This is the script for installing OpenCV4.x with cuda in anaconda or default python

uninstall your old version OpenCV

if you can find the build folder, you can run:

cd build
sudo make uninstall
cd ../
rm -rf build

and remove all the opencv lib:

$  rm -r /usr/local/include/opencv2 /usr/local/include/opencv /usr/include/opencv /usr/include/opencv2 /usr/local/share/opencv /usr/local/share/OpenCV /usr/share/opencv /usr/share/OpenCV /usr/local/bin/opencv* /usr/local/lib/libopencv*
$  cd /usr
$  find . -name "*opencv*" | xargs sudo rm -rf

if you don't have the build folder , you can rebuild your old version follow next step , then try again.

Build OpenCV in anaconda with Cuda

git clone 

cd opencv_install

bash ./opencv_install.sh

First of all ,you should set same parameters for installing OpenCV and cuda setting

• INSTALL_DIR: Where the OpenCV installed,default is /usr/local, recommand /usr/local
• OPENCV_SOURCE_DIR: Where the OpenCV sources code download,default is your home dir
• WITH_CUDA: With cuda or not
• ARCH_BIN: You should check your device arch_bin in Nvidia Devices
• VIRTUAL_PYTHON_PATH: Where is your python path,example: /home/dnn/anaconda3/envs/opencv3
• PYTHON_VERSION: which python version your virtual envs use for,example: python3.6

Example

My test envs:

• OpenCV 4.5.0
• Ubuntu18.04
• GTX 1080
• Cuda 10.0
• Cudnn 7.6.3
• anaconda3
• virtual envs: movie
• make sure your virtual envs install numpy

[BASH]  Choose the OpenCV Version :(Enter:default 4.2.0) 4.5.0
 OpenCV Version: 4.5.0
[BASH]  Change the path which OpenCV will be installed:(Enter:default /usr/local)
 OpenCV will be installed in: /usr/local
[BASH]  Change the path which OpenCV Source path:(Enter:default $HOME)
 OpenCV source be downloaded in: /home/dnn
[BASH]  Do you want to build with Cuda ? (y/n): y
 What is your arch_bin : 6.1
[BASH]  where is your python path ? (default: /usr): /home/dnn/anaconda3/envs/movie
[BASH]  what is your python version ? (default: python3.6): 
[BASH]  Build configuration: 
 OpenCV binaries will be installed in: /usr/local
 OpenCV Source will be installed in: /home/dnn
 OpenCV build with Cuda or not: y
 Cuda ARCH_BIN: 6.1
 Python path: /home/dnn/anaconda3/envs/movie
 Python version: python3.6
[BASH]  Do you wish to continue? (y/n) y

Please check your python install path!!!

--   Python 3:
--     Interpreter:                 /home/dnn/anaconda3/envs/movie/bin/python3 (ver 3.6.12)
--     Libraries:                   /home/dnn/anaconda3/envs/movie/lib/libpython3.6m.so.1.0 (ver 3.6.12)
--     numpy:                       /home/dnn/anaconda3/envs/movie/lib/python3.6/site-packages/numpy/core/include (ver 1.19.2)
--     install path:                lib/python3.6/site-packages/cv2/python-3.6

you can see install_path : lib/python3.6/site-packages/cv2/python-3.6

Linking .so file to your envs

cd /usr/local/lib/python3.6/site-packages/cv2/python-3.6

ls -l

you will see like this:

cv2.cpython-36m-x86_64-linux-gnu.so

then link to your virtual envs:

cd /home/dnn/anaconda3/envs/movie/lib/python3.6/packages

sudo ln -s /usr/local/lib/python3.6/site-packages/cv2/cv2.cpython-36m-x86_64-linux-gnu.so cv2.so

Test

conda activate movie

python

import cv2

cv2.__version__