Ubuntu or container install CV2

1 Install cv2 in Ubuntu

Common errors:

python

import cv2 

Error: ModuleNotFoundError: No module named 'cv2'

 

In general, the default installed version is lower, and the lower version is not compatible with the higher version, so I guess it is a problem with the opencv version , my python3.6. Download the corresponding opencv offline package according to the official website (preferably placed in the following directory)

opencv_python-3.4.6.27-cp36-cp36m-manylinux1_x86_64.whl

Then install:

pip3 install opencv_python-3.4.6.27-cp36-cp36m-manylinux1_x86_64.whl

Displayed after installation is complete

Successfully installed opencv-python-3.4.6.27

Test verification:
 

2 Docker container install cv2

To follow the cat and draw the tiger, we only need to send the installation package we downloaded in ubantu to the corresponding container, and repeat the above process.

lab@lab-virtual-machine:~/oai-cn5g-fed/docker-compose$ docker cp /home/lab/Downloads/opencv_python-3.4.6.27-cp36-cp36m-manylinux1_x86_64.whl bc0dabf8aaf9:/ueransim/bin
WARNING: Error loading config file: /home/lab/.docker/config.json: open /home/lab/.docker/config.json: permission denied
Preparing to copy...

Then install it in the corresponding directory of the container:

Running the python3 script reports an error:

 

2.1 Error resolution

After installing opencv under the docker virtual machine, the following error occurs when using it

Traceback (most recent call last):
  File "data_generator.py", line 24, in <module>
    import cv2
  File "/usr/local/lib/python3.5/dist-packages/cv2/__init__.py", line 3, in <module>
    from .cv2 import *
ImportError: libSM.so.6: cannot open shared object file: No such file or directory

Refer to  Ubuntu's apt-file to solve dependency problems_ubuntu apt dependency_SnailTyan's Blog-CSDN Blog
Install apt-file first

# Install
$ apt-get update
$ apt-get install apt-file
# Update apt-file
$ apt-file update

Then look for the dependent library:

apt-file search libSM.so.6

Follow the prompts to install the appropriate dependency library:

apt-get install libsm6

problem solved