Anaconda：即使安装了 opencv，也无法导入 cv2（如何为 python3 安装 opencv3）

Question

I have Anaconda (version: conda 4.2.9, python3) installed and am trying to do import cv2 when I get the following error:

ImportError: No module named 'cv2'

With conda search cv2 I get this:

  opencv                     2.4.2                np15py26_0  defaults        
                             2.4.2                np15py27_0  defaults        
                             2.4.2                np16py26_0  defaults        
                             2.4.2                np16py27_0  defaults        
                             2.4.2                np17py26_0  defaults        
                             2.4.2                np17py27_0  defaults        
                             2.4.2                np15py26_1  defaults        
                             2.4.2                np15py27_1  defaults        
                             2.4.2                np16py26_1  defaults        
                             2.4.2                np16py27_1  defaults        
                             2.4.2                np17py26_1  defaults        
                             2.4.2                np17py27_1  defaults        
                             2.4.6                np16py26_0  defaults        
                             2.4.6                np16py27_0  defaults        
                             2.4.6                np17py26_0  defaults        
                             2.4.6                np17py27_0  defaults        
                             2.4.6                np18py26_0  defaults        
                             2.4.6                np18py27_0  defaults        
                             2.4.9                np18py27_0  defaults        
                             2.4.10               np19py26_0  defaults        
                             2.4.10               np19py27_0  defaults        
                             2.4.10              np110py27_1  defaults        
                             2.4.10               np19py26_1  defaults        
                             2.4.10               np19py27_1  defaults        

What do I need to do to be able to import the cv2 module?

I am using Ubuntu 16.04.

Answer 1

opencv is not compatible with python 3. I had to install opencv3 for python 3. The marked answer in how could we install opencv on anaconda? explains how to install opencv(3) for anaconda:

Run the following command:

conda install -c https://conda.binstar.org/menpo opencv

I realized that opencv3 is also available now, run the following command:

conda install -c https://conda.binstar.org/menpo opencv3

Edit on Aug 18, 2016: You may like to add the "menpo" channel permanently by:

conda config --add channels menpo

And then opencv can be installed by:

conda install opencv (or opencv3)

Edit on Aug 14, 2017: " clinicalgraphics " channel provides relatively newer vtk version for very recent python3

conda install -c clinicalgraphics vtk

Edit on April 16, 2020 (based on @AMC's comment): OpenCV can be installed through conda-forge (details see here )

conda install -c conda-forge opencv

Answer 2

你可以试试

conda install -c menpo opencv=3

Answer 3

Use this code at the Anaconda prompt:

conda update conda -c conda-canary

Then don't type this code:

conda install -c conda-forge opencv

but, instead, use:

Pip install opencv-python

It worked with me after few days of trials

See Krishna Ojha's video and read the comments below the video.

Answer 4

I had created my Anaconda environment and installed everything I needed, but when trying to import cv2, I always got the message "no module named cv2". I reinstalled and followed Linda's tips, which didn't work.

Finally, I noticed that my Anaconda environment didn't have cv2 installed, even with all I did.
I copied the cv2 folder to "miniconda'X'/envs/yourEnv/lib/python'X.X'/site-packages/" which worked for me.

Answer 5

The file may be not installed properly.

Run the following commands:

Sudo apt-get update
Sudo apt-get upgrade

then

pip install opencv-python

Check-in your jupyter notebook:

import cv2
print cv2.__version__

This may solve the issue.

Answer 6

如果上述解决方案对您不起作用并且您在 conda 环境中安装了 opencv，请尝试以下命令：

conda install nb_conda

Answer 7

opencv不在默认的conda安装仓库中，因此您需要从通道安装它。

conda install --channel https://conda.anaconda.org/anaconda opencv