Install OpenCV for Python on Mac OS X

In our previous post we described how to develop driver assistance systems on Android devices. We are using OpenCV SDK for Android, but during the app development we had to test & calibrate the cameras using a computer. Out platform for now is Mac OS X (Yosemite). Therefore, we needed to install & configure OpenCV for Python on Mac.

Install OpenCV

The “traditional” way didn’t work out: downloading OpenCV zip from their website and then compile it & link it with Python. There is a simpler way to do it using Homebrew.

Homerew is a package manager for Mac OS X, more info can be found on their website.

Installing brew is simpler than you think, just run this in terminal:

You might need to install Python first:

Add OpenCV using the following commands:

Install OpenCV:

Your OpenCV installation will be located at:

Python setup

The final part is to setup Python, use the following:

That’s it! If you have issue with Python when running some OpenCV samples, you need to make sure that you have numpy & matplotlib installed. You can do this using brew, in terminal enter:


Here is a simple Python sample to test out that everything works fine:

Check out the new guide on installing Python and OpenCV 3 using Anaconda: here

More information & sources:

  • OpenCV:
  • Homebrew package manager:
  • Install OpenCV for Python on Mac:
  • Calibrate camera with OpenCV & Python:
  • OpenCV Python samples:
    • Hello,

      thank you for the article, with your help I’ve installed OpenCV with Homebrew.

      In particular, I’ve installed OpenCV 3.0.0-beta because I need some new functions.

      Stuff like SIFT, SURF, BRIEF and FREAK with OpenCV are installed by default in the “nonfree” folder, but with OpenCV 3.0.0 they have been moved to a separate repository called “opencv_contrib” that Homebrew doesn’t install by default.

      So, I would to know if it is possible to install an external repository, like “opencv_contrib”, with Homebrew, and how to do it; or if it is possible to add a repository in another (simple?) way without messing up everything installed with Homebrew.

      Thank you

      • Hi, I also face the problem. Have you solved it?

        • No, at the end I had to reinstall everything without Homebrew and it has worked.
          However I have a blurred memory of the thing, this was 4 month ago, sorry 🙁

    • I couldn’t get this working with OpenCV2.4.10 or OpenCV2.4.11. However seemed to work OK as soon as OpenCV2.4.11_1 became available and I installed it with Homebrew

    • Will Huang


      it is a great tutorial. But I have the following problems:

      cat ~/.bash_profile | grep PYTHONPATH

      I don’t have .bash_profile in my home directory, is there anything wrong?

      ln -s /usr/local/Cellar/opencv/2.4.10/lib/python2.7/site-packages/
      ln -s /usr/local/Cellar/opencv/2.4.10/lib/python2.7/site-packages/
      I got “ln: File exists” and “ln: File exists”.

      Is it because of the missing bash_profile?

      Thank you!

      • Razvan

        Open terminal, type “cd ~/” and then: “touch .bash_profile” to create the file.

    • DaveGao


      I have installed OpenCV successfully using brew on my mac with OS X 10.10.3. Created the symbolic link as well to the and files. when I use the import command in python I receive the following error

      >>> import cv2

      Traceback (most recent call last):

      File “”, line 1, in

      ImportError: dlopen(./, 2): Library not loaded: /usr/local/lib/libImath-2_2.12.dylib

      Referenced from: /usr/local/Cellar/opencv/2.4.11_1/lib/libopencv_highgui.2.4.dylib

      Reason: image not found

    • rickoshay

      What is the purpose of cat’ing ~/.bash_profile and grep’ing for PYTHONPATH?

    • Lin

      Any suggestions? Thanks!

      • Alex Sobrino

        having the same issue :S

      • Daniela Florit

        I am having this same problem. were you able to get a solution? thanks

    • cgrinaldi

      Thanks for the post! Helped keep me from bashing my head in 🙂

    • lunabus

      Thank you so much for this!

    • where do you want to link the and

      • I mv the and into /usr/local/lib/python2.7/site-packages can solve the link error problem

        • cp /usr/local/Cellar/opencv/2.4.12_2/lib/python2.7/site-packages/* /usr/local/lib/python2.7/site-packages/

          • Ilhom Saidjafar

            Could you explain it step by step, please?

    • S Charlesworth

      What if I don’t want to jack with my existing python setup? Does installing python w/ homebrew pretty much wipe that out?

    • Jamie


      Thanks for the step by step guide.

      It looks like this was written about a year ago – Ive followed your instructions with updated the links for python 3.5 and opencv 2.4.12_2, but when I “import cv2” I get this error:

      ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/, 2): Symbol not found: _PyCObject_Type

      Any idea how to fix this please?


    • Frank

      Hi, thanks for the convenient tutorial! Unfortunately I got stuck while installing OpenCV using the ‘brew install opencv’ command. Everything seemed to work fine, until the last part of the installation process. I got this error message:

      Linking /usr/local/Cellar/opencv/2.4.13…
      Error: Could not symlink include/opencv2/calib3d/calib3d.hpp
      /usr/local/include/opencv2/calib3d is not writable.

      Does anyone know how to solve this problem?

      Thank you!

      • Brihi

        Hey! You can always change the permissions using sudo chmod 777 /usr/local/include/opencv2/calib3d to make it writeable!

    • I’m guessing that when your instructions show “cat ~/.bash_profile | grep PYTHONPATH”, you actually mean that you should cd into that directory before creating the symlinks. If so, the following would work better: “cd python -c 'import site; site.getsitepackages()'“.

      • Brad Gibson

        Thanks for this Ken.
        I have to install Python 2 (2.7.13) to run a Python2 script, and needed to run the following to get it to work:
        cd python -c "import site; print(site.getsitepackages()[0])"

    • Ron

      thanks for the tutorial 🙂 could you please tell me how to test the code? where am I supposed to execute the sample code?