I have installed OpenCV on the Occidentalis operating system (a variant of Raspbian) on a Raspberry Pi, using jayrambhia's script found here. It installed version 2.4.5.
When I try import cv2 in a Python program, I get the following message:
pi@raspberrypi~$ python cam.py Traceback (most recent call last) File "cam.py", line 1, in <module> import cv2 ImportError: No module named cv2 The file cv2.so is stored in /usr/local/lib/python2.7/site-packages/...
There are also folders in /usr/local/lib called python3.2 and python2.6, which could be a problem but I'm not sure.
Is this a path error perhaps? Any help is appreciated, I am new to Linux.
324 Answers
First do run these commands inside Terminal/CMD:
conda update anaconda-navigator conda update navigator-updater Then the issue for the instruction below will be resolved
For windows if you have anaconda installed, you can simply do
pip install opencv-python or
conda install -c opencv if you are on linux you can do :
pip install opencv-python or
conda install opencv For python3.5+ check these links : Link3 , Link4
Update:
if you use anaconda, you may simply use this as well (and hence don't need to add menpo channel):
conda install -c conda-forge opencv This happens when python cannot refer to your default site-packages folder where you have kept the required python files or libraries
Add these lines in the code:
import sys sys.path.append('/usr/local/lib/python2.7/site-packages') or before running the python command in bash move to /usr/local/lib/python2.7/site-packages directory. This is a work around if you don't want to add any thing to the code.
6I solved my issue using the following command :
conda install opencv Try to add the following line in ~/.bashrc
export PYTHONPATH=/usr/local/lib/python2.7/site-packages:$PYTHONPATH Python3.x User
sudo pip3 install opencv-python For Windows 10 and Python 3.6, this worked for me
pip install opencv-contrib-python
None of the above answers worked for me. I was going crazy until I found this solution below!
Simply run:
sudo apt install python-opencv I solved my issue using the following command :
pip install opencv-python pip install opencv-python or
pip install opencv-python3 will definately works fine
It would be your solution :
pip install opencv-contrib-python Works like a charm....!
I solve it by running:
pip3 install opencv-python I solve this by run code pip install opencv_contrib_python
I have come accross same as this problem i installed cv2 by
pip install cv2 However when i import cv2 module it displayed no module named cv2 error.
Then i searched and find cv2.pyd files in my computer and i copy and paste to site-packages directory
C:\Python27\Lib\site-packages then i closed and reopened existing application, it worked.
EDIT I will tell how to install cv2 correctly.
1. Firstly install numpy on your computer by
pip install numpy
2. Download opencv from internet (almost 266 mb).
I download opencv-2.4.12.exe for python 2.7. Then install this opencv-2.4.12.exe file.
I extracted to C:\Users\harun\Downloads to this folder.
After installation go look for cv2.py into the folders.
For me
C:\Users\harun\Downloads\opencv\build\python\2.7\x64 in this folder take thecv2.pyd and copy it in to the
C:\Python27\Lib\site-packages now you can able to use cv2 in you python scripts.
If want to install opencv in virtual environment. Run command in terminal for getting virtual environment list.
conda env list or jupyter notebook command is
!conda env list Then update your anaconda.
conda update anaconda-navigator conda update navigator-updater Install opencv in your selected environment path.
conda install -c ['environment path'] opencv Juypter notebook
!conda install --yes --prefix ['environment path'] opencv IF YOU ARE BUILDING FROM SCRATCH, GO THROUGH THIS
You get No module named cv2.cv. Son, you did all step right, since your sudo make install gave no errors.
However look at this step
$ cd ~/.virtualenvs/cv/lib/python2.7/site-packages/ $ ln -s /usr/local/lib/python2.7/site-packages/cv2.so cv2.so THE VERY IMPORTANT STEP OF ALL THESE IS TO LINK IT.
ln -s /usr/local/lib/python2.7/site-packages/cv2.so cv2.so or ln -s /usr/local/lib/python2.7/dist-packages/cv2.so cv2.so The moment you choose wise linking, or by brute force just find the cv2.so file if that exist or not
Here I am throwing my output.
Successfully installed numpy-1.15.3 (cv) demonLover-desktop:~$ cd ~/.virtualenvs/cv/lib/python2.7/site-packages/ (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ln -s /usr/local/lib/python2.7/site-packages/cv2.so cv2.so (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ pip list Package Version ---------- ------- numpy 1.15.3 pip 18.1 setuptools 40.5.0 wheel 0.32.2 (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ python Python 2.7.12 (default, Dec 4 2017, 14:50:18) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named cv2 >>> [2]+ Stopped python (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ls /usr/local/lib/python2.7/site-packages/c ls: cannot access '/usr/local/lib/python2.7/site-packages/c': No such file or directory (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ls /usr/local/lib/python2.7/site-packages/ (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ deactivate demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ls /usr/local/lib/python2.7/site-packages/ demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ls cv2.so easy_install.py easy_install.pyc numpy numpy-1.15.3.dist-info pip pip-18.1.dist-info pkg_resources setuptools setuptools-40.5.0.dist-info wheel wheel-0.32.2.dist-info demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ls /usr/local/lib/python2.7/site-packages/ demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ls -l /usr/local/lib/python2.7/site-packages/ total 0 demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ls cv2.so easy_install.py easy_install.pyc numpy numpy-1.15.3.dist-info pip pip-18.1.dist-info pkg_resources setuptools setuptools-40.5.0.dist-info wheel wheel-0.32.2.dist-info demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ workon cv (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ python Python 2.7.12 (default, Dec 4 2017, 14:50:18) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named cv2 >>> [3]+ Stopped python (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ find / -name "cv2.so" find: ‘/lost+found’: Permission denied find: ‘/run/udisks2’: Permission denied find: ‘/run/docker’: Permission denied find: ‘/run/exim4’: Permission denied find: ‘/run/lightdm’: Permission denied find: ‘/run/cups/certs’: Permission denied find: ‘/run/sudo’: Permission denied find: ‘/run/samba/ncalrpc/np’: Permission denied find: ‘/run/postgresql/9.5-main.pg_stat_tmp’: Permission denied find: ‘/run/postgresql/10-main.pg_stat_tmp’: Permission denied find: ‘/run/lvm’: Permission denied find: ‘/run/systemd/inaccessible’: Permission denied find: ‘/run/lock/lvm’: Permission denied find: ‘/root’: Permission denied ^C (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ sudofind / -name "cv2.so" sudofind: command not found (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ^C (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ sudo find / -name "cv2.so" [sudo] password for app: find: ‘/run/user/1000/gvfs’: Permission denied ^C (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ sudo find /usr/ -name "cv2.so" /usr/local/lib/python2.7/dist-packages/cv2.so ^C (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ln -s /usr/local/lib/python2.7/dist-packages/ccv2.so cv2.so click/ clonevirtualenv.pyc configparser-3.5.0.dist-info/ configparser.py cv2.so cycler.py clonevirtualenv.py concurrent/ configparser-3.5.0-nspkg.pth configparser.pyc cycler-0.10.0.dist-info/ cycler.pyc (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ln -s /usr/local/lib/python2.7/dist-packages/cv2.so cv2.so ln: failed to create symbolic link 'cv2.so': File exists (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ rm cv2.so (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ln -s /usr/local/lib/python2.7/dist-packages/cv2.so cv2.so (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ ls cv2.so easy_install.py easy_install.pyc numpy numpy-1.15.3.dist-info pip pip-18.1.dist-info pkg_resources setuptools setuptools-40.5.0.dist-info wheel wheel-0.32.2.dist-info (cv) demonLover-desktop:~/.virtualenvs/cv/lib/python2.7/site-packages$ python Python 2.7.12 (default, Dec 4 2017, 14:50:18) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 >>> My step will only help, if your built is done right.
2For python3x users
$ sudo pip3 install opencv-python For python2x users
$ sudo pip install opencv-python Easy
python -m pip install --upgrade pip Then
pip install opencv-python This Question Have easy Solutions
- Install Anconda Navigator
- Then Go to Environment And Search "Opencv"
- Add the Tick Mark and Apply Install
- Finally slove the Problem
Try this out:
sudo ldconfig sudo nano /etc/ld.so.conf.d/opencv.conf and add this following line in the opencv.conf not in the command window
/usr/local/lib Then:
sudo ldconfig sudo nano /etc/bash.bashrc and add this two lines in the bash.bashrc not in the command window
PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig export PKG_CONFIG_PATH at last reboot your Pi sudo reboot now
and try import cv2
Another way I got opencv to install and work was inside visual studio 2017 community. Visual studio has a nice python environment with debugging.
So from the vs python env window I searched and added opencv. Just thought I would share because I like to try things different ways and on different computers.
I had the same problem, just couldn't figure it out with opencv2 and opencv3 installed into /opt/opencv and opencv3 respectively. Turned out that bloody anaconda install of opencv in my home directory was first on path and mangled opencv. Removed it and started using /opt/opencv3/lib as defined in /etc/ld.so.conf.d/opencv.conf. Worked perfectly first go. Do you have anaconda installed? Could be the issue.
1I know you had the issue with Occidentalis, but I had the issue on Windows too, and I didn't found anything helpful. So if you have windows, and you've installed opencv, but you still get an Import error, this method will maybe solve the issue.
I managed to solve the issue, by reactivating anaconda.
First I deleted your\path\to\anaconda3 and your\path\to\anaconda3\Scripts from PATH (you will need these later, so remember these paths)
Then if you run python from cmd it will say:
Warning: This Python interpreter is in a conda environment, but the environment has not been activated. Libraries may fail to load. To activate this environment please see Then in Anaconda prompt I ran these:
your\path\to\anconda3\Scripts\activate base conda activate --stack your\path\to\anaconda3 I'm not sure about is this the easiest way to reactivate anaconda, but this is what worked for me.
This is for those who are using ubuntu to run their script.py you have to copy cv2.so under your python pachkages dir and then resourcing your bachrc. here:
sudo cp -rfv /home/<user>/<your opencv file dir>/lib/cv2.so /usr/local/lib/python2.7/site-packages/ export PYTHONPATH=/usr/local/lib/python2.7/site-packages:$PYTHONPATH Create a virtual environment and then install open-cv there. It worked for me. And, it is best practice to create a virtual environment. Create a virtual environment:
python3 -m venv env Activating virtual environment For Linux:
source env/bin/activate Install OpenCV and other modules now.
pip3 install opencv-python Above will work for linux. Similarly, you can create virtual environment for windows and then install opencv More on Virtual Environment:
