with-contrib - This is optional, but recommended. By now you're hopefully using a compiler that supports modern C++! c++11 - Tells Homebrew to build with C++11 support. with-python3 - Tells Homebrew to include Python 3 support for OpenCV.
#Install opencv for python3 mac install
The opencv formula will install the latest version of OpenCV 2. Note that Homebrew has both an opencv and opencv3 package. Let’s break down the commands and options a little bit:īrew install opencv3 - This specifies the package to install. If something went wrong, check out the Troubleshooting section below. If you are using Python 3.4.3, replace python3.5 above with python3.4) Then run this command:Įcho /usr/local/opt/opencv3/lib/python3.5/site-packages > venv/lib/python3.5/site-packages/opencv3.pthĪnd you should now be able to import cv2 from within your virtual environment! If you have a different Python version than 3.5, you will need to change the major version numbers in the command above. Here I assume that the virtual environment exists in the venv directory. Open a command prompt and cd to the directory where your virtualenv is installed. If you're using a virtual environment, there is one more step to get Python to recognize the OpenCV package. So far I've assumed you're working with the standard Python installation. Type "help", "copyright", "credits" or "license" for more information. First install the opencv3 package with Homebrew, and then tell Python 3 where to look for the OpenCV binary: There are two steps to correctly install Python support. I’ll assume that Homebrew is up-to-date and brew doctor doesn't bring up anything serious before installing OpenCV. What follows are the instructions to correctly install. Even though OpenCV includes the Python 2 bindings by default, the same is not true of Python 3. This seems especially true when trying to use the Python bindings that OpenCV provides. Usually Homebrew makes dependency management a breeze, but OpenCV is a curious exception to this rule. Since our research team all develops on OS X, we also make use of the Homebrew package manager. It’s very useful for implementing computer vision algorithms, but getting the library installed properly isn’t always easy. Introductionĭo you want to use OpenCV, but can't get it to work with Python 3? You've come to the right place! Here at Gravity Jack we tackle computer vision problems using OpenCV as one of the tools in our arsenal. Run the following command, the installation is successful.Post by Gravity Jack research team member, Marc Rollins. Ln -s /usr/local/Cellar/opencv3/3.1.0_4/lib/python3.5/site-packages/ cv2.soĪctivate the virtualenv virtual environment, enter python > import cv2 cd /usr/local/lib/python3.5/site-packages Just go to the site-packages folder of python3 and create a soft link with the original so above. I am associated with a virtual environment, and the same is true for the python physical environment. The following is the association with the python3 environment, as well as the association with the virtual virtualenv development environment. So what we need to find is the cv2*.so file of opencv (refer to my previous ubuntu installation of opencv and finally the associated cv2.so file), and finally my so file location is: /usr/local/Cellar/opencv3/3.1.0_4/lib/python3.5/site-packages/ Note that we installed the programs using homebrew above, and the locations of the programs installed by homebrew are below. Our next task is to correctly associate python3 with opencv. If it is not successful, continue to see. If it is successful, congratulations, you don’t have to look further down.
If opencv is not installed successfully after the above steps (in fact, opencv has been installed, but it is not correctly associated with python3), you can try the following command again: brew unlink opencv3 & brew link -force opencv3 with-contrib is used to install opencv's contrib support. c++11 is used to tell homebrew to provide c++11 support, with-python3 is used to tell homebrew to use opencv to support python3, Congratulations! First explain the above commandīrew install opencv3 This command is used to specify the python3 version to be installed (there are two python versions, opencv and opencv3, the former corresponds to python2), If there is no error, the installation was successful. Run the command: brew install opencv3 -with-python3 -c++11 -with-contrib
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