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I installed opencv 4.3.0 from the source. It was installed sucessfully.
pkg-config --modversion opencv4 gives the output 4.3.0 . But when i try to import cv2 module in pythone it says cv2 module not found. I have Linux(Debian) in my system with python 3.8.
Likely has to do with where the package was installed. If you used apt-get, I would recommend removing and trying with pip install opencv-python. Aside from that, you can also try running sudo python3 and then importing.
hope that helps!
My environment:
Ubuntu 18.0.4 LTS (also tried on 19.04)
I use/need python3 (3.6.8 installed)
I need cv2, which is a model of opencv.
I tried several receipts I found on the Internet, but nothing worked.
I tried to install as pre-compiled (sudo apt-get install python-opencv) - No error, but when I try the test:
import cv2 as cv
print(cv.__version__)
I get error module not found.
The problem seems that I have installed also anaconda. The above test uses then anaconda, and cannot find the module.
Compiling from source installed for python2, but I do need python3. (The test also uses anaconda)
One of my receipts worked till the end, but with the line:
workon OpenCV-master-py3
It gaves me the error workon not found.
I tried then to install via Conda, but that wants to downgrade Conda.
Is there a way to run it without anaconda and find a replacement for
"workon OpenCV-master-py3"
For python3 you can simply do pip3 install opencv-python and it will work.
using workon
creating virtual environment
mkvirtualenv -p python3 opencv
Inside the virtual environment.
If you are only working with images
pip install opencv-python
opencv-python
If you need support for working videos
pip install opencv-contrib-python
opencv-contrib-python
If you need a non GUI opencv
pip install opencv-python-headless
opencv-python-headless
If you need to install specific version you can use == to check the available version first like
pip install opencv-python== ,then install the version you require
I need to install cv2 for a script that has been written for me. I tried pip install cv2 and pip install open_cv and got the same problem - a warning message from dist.py and complains about zlib being not found. No cv2 installed. I also tried pyopenvc and pip install opencv-python.
So, I went to the opencv site and downloaded the relevant exe. Ran it - generated a heap of subdirectories and a make file and stuff.
What do I do now?
Install opencv-python (which is an unofficial pre-built OpenCV package for Python) by issuing the following command:
pip install opencv-python
run the following command by creating a virtual enviroment using python 3 and run
pip3 install opencv-python
to check it has installed correctly run
python3 -c "import cv2"
In pip package management, there are 4 different OpenCV packages all using the same namespace, cv2. Although they are not officially supported by OpenCV.org, they are commonly used in developers' community. You could install any of them using the following command:
pip install PACKAGE_NAME
where PACKAGE_NAME can be
opencv-python (only contains main modules)
opencv-contrib-python (contains both main and contrib modules)
opencv-python-headless (same as opencv-python but without GUI functionality)
opencv-contrib-python-headless (same as opencv-contrib-python but without GUI functionality)
You should only install one of them depending on your needs. If you accidentally installed multiple of them in the same environment, you can remove them using pip uninstall before installing the correct one again.
For more details, you can refer to the project description of OpenCV on Wheels.
As of 2021, all of these 4 packages are official OpenCV projects. Source: OpenCV Website.
To Install the Current Latest version of OpenCV then use the below commands:
Use this Command:
pip install --upgrade opencv-python
If you're facing problem in above command then try this :
pip install --upgrade opencv-contrib-python
To check the version of installed OpenCV:
import cv2
print(cv2.__version__)
Simply use this for the so far latest version 4.1.0.
pip install opencv-contrib-python==4.1.0.25
For the default version use this:
pip install opencv-contrib-python
If you have a new Raspberry Pi and want to install OpenCV then this tutorial would be a good choice.
For Ubuntu/Linux users:
sudo apt install python3-opencv
As of 10/22/2019, I think the best answer is simply
conda install opencv
It appears opencv is now in the main Anaconda channel.
To see which packages (including opencv) are in the main Anaconda channel go to Anaconda Package Lists and follow the link corresponding to your python version and os version.
Everybody struggles initially while installing OpenCV. OpenCV requires a lot of dependencies in the backend. The best way to start with OpenCV is, install it in a virtual environment. I suggest that you use the Python Anaconda distribution and create a virtual environment using it. Then inside the virtual environment, you can install OpenCV using this command:
conda install -c conda-forge opencv
Please follow the command:
pip install opencv-python
then if you want to use:
import cv2
If it's not worked due to any update, please follow the documentation
Make a virtual enviroment using python3
virtualenv env_name --python="python3"
and run the following command
pip3 install opencv-python
to check it has installed correctly run
python3 -c "import cv2"
To install open_cv you can go to this website or do this,
pip install opencv-contrib-python --upgrade
pip install opencv-python
You can test it by:
C:\> python
>>> import cv2
>>> print(cv2.__version__)
'4.5.1' # your version may be a newer one
You can install opencv the normal way:
pip install opencv-python
If you are getting errors, you can do this:
pip install opencv-python-headless
Open anaconda command prompt and type in below command.
conda install -c conda-forge opencv
Once the 'Solving environment' is done. It will ask to download dependencies. Type 'y'.
It will install all the dependencies and then you are ready to code.
I recommend this for Python 3: Please install it this way with pip
pip3 install opencv-python
This will download and install the latest version of OpenCV.
You could try using below command-
pip install opencv-contrib-python
It will basically download the compatible version. If this command fails, you could upgrade you pip using below command-
python -m pip install –upgrade pip
If you need a pictorial guide, head over to Simple Steps to Install OpenCV in Windows
You can also try installing OpenCV from prebuilt binaries from the official OpenCV site.
->pip install opencv-python you can use this.
But if this code does not working then you can check python version on cmd and anaconda because they are different. So you type command in anaconda prompt and cmd, it will work. You can check this -> pip list
Open terminal
Run the following command
pip install --trusted-host=pypi.org --trusted-host=files.pythonhosted.org opencv-python.
Hope it will work.
Installing cv2 or opencv-python using pip is sometimes a problem. I was having the same problem of installing cv2 with pip. The installation wasn't a problem the problem was to import cv2 after installation. I was getting an Import Error so to fix this i import main from pip to install opencv-python. Try to run the following code in your python file then opencv-python will be installed
from pip._internal import main as install
try:
import cv2
except ImportError as e:
install(["install", "opencv-python"])
finally:
pass
I hope this will help someone
As a reference it might help someone... On Debian system I hard to do the following:
apt-get install -y libsm6 libxext6 libxrender-dev
pip3 install opencv-python
python3 -c "import cv2"
On Ubuntu you can install it for the system Python with
sudo apt install python3-opencv
if you are using Pycharm navigate settings > Project:name > Project interpreter just search the module by name(in this case OpenCV-python) and install it. worked for me
In case you use aarch64 platform with ARM64 cpu - and/or docker
On a development board on ARM64, no python-opencv version were found at all
version: NONE.
I've had to build from source. This allowed to include CUDA support.
In my case it was already available on the board but it wasn't found on the development environment.
If compiling from source is out of reach, there are Dockers
Of course compiling will take some time (few hours on ARM core), but it is worthy process to know as most open source tools can be built this way in case of issues.
I've had this problem in Google Colab, It only worked with this specific package version.
!pip install "opencv-python-headless<4.3"
There are two options-
pip install cv2
or
pip install opencv-python
Hope it helps.
Recently I used opencv Python to handle Video Steam.
Normally I should install opencv-python via pip.
However I found that the opencv-python in pypi is unofficial package.
And it's just a package with opencv core, which does NOT including packages like contrib and FFmpeg...
If you wanted a version of opencv with extra packages, you should possibly download the opencv source code and build your own Opencv Python Bindings.
For me, this is not a friendly way to manage Opencv compared to other python libs in pypi.
Does anyone have a more elegant way to manage opencv python in both Mac and Linux OS please?
if u have anaconda then just open anaconda prompt and you can try
conda install -c conda-forge opencv
or for opencv 3 version you can try
conda install -c menpo opencv3
The easies way to install opencv-python is link or this link.
pip install will just install opencv-core, which does not include FFmpeg lib...
I've been trying to install both OpenCV and cv2 from both Pycharm and from the terminal as suggested using:
pip install --user opencv
pip install --user cv2
but I'm getting the following error for them:
Collecting opencv
Could not find a version that satisfies the requirement opencv (from versions: )
No matching distribution found for opencv
and
Collecting cv2
Could not find a version that satisfies the requirement cv2 (from versions: )
No matching distribution found for cv2
How can I fix these and install the packages properly? I'm using python 3.4.
You are getting those errors because opencv and cv2 are not the python package names.
These are both included as part of the opencv-python package available to install from pip.
If you are using python 2 you can install with pip:
pip install opencv-python
Or use the equivilent for python 3:
pip3 install opencv-python
After running the appropriate pip command your package should be available to use from python.
This the correct command that you need to install opencv
pip install opencv-python
if you get any error when you are trying to install the "opencv-python" package in pycharm, make sure that you have added your python path to 'System Variables' section of Environment variables in Windows.
And also check whether you have configured a valid interpreter for your project
I ran into the same problem. One issue might be OpenCV is created for Python 2.7, not 3 (not all python 2.7 libraries will work in python 3 or greater). I also don't believe you can download OpenCV directly through PyCharm's package installer. I have found luck following the instructions: OpenCV Python. Specifically:
Downloading and installing OpenCV from SourceForge
Copying the cv2.pyd file from the download (opencv\build\python\2.7\x64) into Python's site-packages folder (something like: C:\Python27\Lib\site-packages)
In PyCharm, open the python Console (Tools>Python Console) and type:import cv2, and assuming no errors print cv2.__version__
Alternatively, I have had luck using this package opencv-python, which you can straightforwardly install using pip with pip install opencv-python
Good luck!
python3.6 -m pip install opencv-python
will install cv2 in python3.6 branch
On Windows:
!pip install opencv-python
Try this. I am using Jupyter notebook (OS: Ubuntu 16.04 LTS on Google Cloud Platform + on Windows). Executed following command in the Jupyter notebook to install opencv:
!pip install opencv-contrib-python #working on both Windows and Ubuntu
After successful installation you will get following message:
Successfully installed opencv-contrib-python-4.1.0.25
Now restart the kernel and try to import opencv as:
import cv2
The same command can be used to installed opencv on Windows as well.
SOLUTION 2: try following commands to install opencv:
For Ubuntu:
Run following command from terminal:
sudo apt-get install libsm6 libxrender1 libfontconfig1
Restart Jupyter notebook kernel and execute following command:
!pip install opencv-contrib-python
NOTE: You can run all the above commands from the terminal as well without using '!'.
Keep it simple and just run.
pip install opencv-python
This is the simplest way of installing opencv.
If you still face issue, create a virtual environment and try installing opencv.
I rather use Virtualenv to install such packages rather than the entire system, saves time and effort rather than building from source.
I use virtualenvwrapper
Windows user can download
pip install virtualenvwrapper-win
https://pypi.org/project/virtualenvwrapper-win/
Linux follow
pip install opencv-python
opencv-python
If processing a video is required
pip install opencv-contrib-python
opencv-contrib-python
If you do not need GUI in Opencv
pip install opencv-contrib-python-headless
opencv-contrib-python-headless
here is a tutorial that worked for me without any problem.
Copied from the site above the important part:
Download the OpenCV version corresponding to your Python installation
from here. In my case, I’ve used
opencv_python-3.1.0-cp35-cp35m-win32.whl.
Now, open a cmd window like before. You can open this directly in your
Downloads folder if you SHIFT and right click inside it. The idea is
to open a cmd window where you’ve downloaded the above [...] file. Use
the [...] command to install [...] OpenCV:
1 pip install "opencv_python-3.1.0-cp35-cp35m-win32.whl"
Additional note: don't forget to change the name of the downloaded file in the command you use.
Apparently by installing opencv, you'll have access to cv2 too.
Installing opencv is not that direct.
You need to pre-install some packages first.
I would not recommend the unofficial package opencv-python. Does not work properly in macos and ubuntu (see this post). No idea about windows.
There are many webs explaining how to install opencv and all required packages.
For example this one.
The problem of trying to install opencv several times is that you need to uninstall completely before attempting again, or you might end having many errors.
you must install opencv-python
pip/pip3 install opencv-python
if you try import opencv-python, receive error.
Fix this error, use the import cv2
How about try some different mirrors?
If you are in China, I highly recommend you try:
sudo pip install --index https://pypi.mirrors.ustc.edu.cn/simple/ opencv-contrib-python
If not, just replace the url address to some other mirrors you like!
Good luck.
this will help you
pip3 install opencv-python
this is the snippet of successful installation
First step:
pip uninstall numpy
pip uninstall opencv-python
Second step:
pip install numpy
pip install opencv-python
I had the same problem. Here are the steps for Windows 10 users.
Open CMD: win+r then type cmd. Now,
Type pip install virtualenv
Create a Virtual Environment, Type virtualenv testopencv
Get Inside testopencv, Type cd testopencv
Activate the Virtual Environment, Type .\Scripts\activate
Now Install Opencv, Type pip install opencv-contrib-python --upgrade
Let's test Opencv, Type Python then import cv2 hit enter then type print(cv2.__version__) to check if its installed
Now, open a new cmd, win + r then type cmd, repeat step 6. If it gives you an error.
Go inside the testopencv folder, inside lib. Copy everything, go to your python directory, inside lib folder paste it and skip that are already present.
Again open a new cmd, repeat Step 6.
Hope it helps.
In win, download the py based latest numpy and Opencv from Unofficial Windows Binaries for Python Extension Packages and pip install its source in cmd. Later copy site-package folder from main py lib to venv lib.
In jetso nano this work for me.
$ git clone https://github.com/JetsonHacksNano/buildOpenCV
$ cd buildOpenCV
When I was facing this issue I used to install OpenCV in pycharm installed package panel where we can find under the settings tab. Search "OpenCV-python" and install it in the installed package panel of right interpreter.
First run from cmd
pip --version
to make sure that you have the updated version installed.
Then run
pip install opencv-python
Go through with this link: https://learnopencv.com/install-opencv-4-on-raspberry-pi/
you can install OpenCV perfectly with out any error. but the problem was it will take lot of time to install.
I had used pi3 model B+ with 32GB class10 SD card for me it took more than 12 hours for complete installation.
If you still find any error to install open-cv in your mac, try this:
opencv-python==4.2.0.34
This worked for me.