How do I install opencv using pip?

Question

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 pro

Answer 1

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.

Answer 2

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.

Answer 3

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.

Answer 4

1. Open terminal
2. Run the following command pip install --trusted-host=pypi.org --trusted-host=files.pythonhosted.org opencv-python.
3. Hope it will work.

Answer 5

As of OpenCV 2.2.0, the package name for the Python bindings is "cv".The old bindings named "opencv" are not maintained any longer. You might have to adjust your code.

The official OpenCV installer does not install the Python bindings into your Python directory. There should be a Python2.7 directory inside your OpenCV 2.2.0 installation directory. Copy the whole Lib folder from OpenCV\Python2.7\ to C:\Python27\ and make sure your OpenCV\bin directory is in the Windows DLL search path.

Alternatively use the opencv-python installers at http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv.

Or Simply install

sudo pip3 install opencv-python  #for python3

sudo pip install opencv-python   #for python2

Answer 6

Everybody struggles initially while installing opencv. Opencv requires lot of dependencies in back-end. The best way to start with opencv is, install it in virtual environment. I suggest you to first install python anaconda distribution and create virtual environment using it. Then inside virtual environment using conda install command you can easily install opencv. I feel this is the most safe and easy approach to install opencv. The following command work for me, you can try the same.

conda install -c menpo opencv3