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pythonmacosopencvmacports

opencv python osx

(Step 1)

I'm trying to get openCV to run from python on my mac using the MacPorts install http://opencv.willowgarage.com/wiki/Mac_OS_X_OpenCV_Port, and also trying to follow The Petite Geek's guide:

sudo port -v install opencv +python26

It runs for about 10 minutes without errors.

(Step 2)

I download ctypes-opencv source and demo files. I navigate to the src directory and run:

sudo python setup.py install

I see like 50 lines almost all of the form: copying ... -> ..., which looks good to me. No errors here.

(Step 3)

I add export DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib to the end of my ~/.profile.

(Step 4)

I open a new terminal to test my install. From my home folder:

$ python

Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39) 
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named cv
>>>

Does not work.

I read somewhere that opencv installs python bindings with the default version of python for OSX, and I am probably running a non-default version, but this is not actionable information to me.

Solution

  • I struggled for a while with Python on Mac. Here is how I finally (and easily!) installed it. Remove all the things Python you have on there already. They will probably be located at /Library/Frameworks/Python.Framework and /opt/local/var/macports/software/py26*

    First download Python with Macports. 

    sudo port install python27

    Then make sure your system is using this version with: 

    sudo port select --set python python27

    Next install numpy with: 

    sudo port install py27-numpy

    Now install opencv: 

    sudo port install opencv +python27

    Now edit your ~/.bash_profile with: 

    sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit ~/.bash_profile

    or

    open -t ~/.bash_profile

    and add the line:

    export PYTHONPATH=/opt/local/var/macports/software/opencv/2.2.0_0+python27/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages:$PYTHONPATH

    or where ever your version of the cv.so file is hidden....

    Now restart terminal and try: 

    %python
>>>import cv

    I'm using Netbeans for opencv and python and it works really nice. Good luck.