Monthly Archives: May 2012

installing OpenCV on MacOS Snow Leopard for Python 2.6

As a result of encountering problems in installing OpenCV, I thought I would drop a few lines with the sequence of steps that worked for me, in the end. However Homebrew looks cooler, and probably it is, I found it more helpful to make use of MacPorts and do all of the installation with it.

My specific problem was that Python 2.6 (Framework) was 32-bit which then clashed with the Homebrew installation of OpenCV 2.3.1a which is 64-bit. Homebrew instructions says you can customise the installation to 32-bit but… it just didn’t work, not even in installing Python 2.6 64-bit as a Framework.

So, I moved on to try the MacPorts option and that actually managed to install Python 2.6 64-bit as a Framework, in the first place, and the rest of the libraries followed smoothly after too.

So, installing MacPorts is step one. Use the Terminal from now on.

2) sudo port selfupdate
3) install zlib, sudo port install zlib +universal
4) install Python 2.6.8 (as framework and 64-bit), sudo port install python26 +universal
5) make it the first choice,
sudo port select –set python python26 (or ‘sudo port select python python26’ in Mac OS Lion)
6) install OpenCV,
sudo port -v install opencv +python26
7) (optional) install PyQt4 and OpenGL library,
sudo port install py26-pyqt4

sudo port install py26-opengl

That’s all.

A test to see whether your python is 64-bit is open python in Terminal and type
print hash(‘a’)
If the result is 12416037344 then you’re setup with a 64-bit python framework.

Hope this helps,
Ivano