(I posted the same question on stackoverflow: https://stackoverflow.com/questions/53816368/trouble-installing-opencv-on-a-mac-after-opencv-worked-fine-a-few-months-ago)
I have opencv installed on my mac which was working a few months ago but doesn't work anymore.
I have the following specificities. - OpenCV: 3.4.3.1 - Operating System / Platform: macOS 10.14 - Python 3.6.5
I tried to reload a python script where I used opencv. However, I got the following error message:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: dlopen(/anaconda3/lib/python3.6/site-packages/cv2.so, 2): Library not loaded: /usr/local/opt/ilmbase/lib/libImath-2_2.12.dylib
Referenced from: /usr/local/Cellar/opencv/3.4.1_4/lib/libopencv_imgcodecs.3.4.dylib
Reason: image not found
I then tried to re-install opencv with the step by step explanation of this site with which I successfully installed opencv for the first time.
- determine which version of opencv I have on my machine
After having written cd /usr/local/Cellar/opencv and ls I get: 3.4.1_4 3.4.3 3.4.3_1. So I conclude that the latest version on my machine is 3.4.3_1 which is in /usr/local/Cellar/opencv/3.4.3_1/cv2.cpython-37m-darwin.so
- Determine the path for package in python
Then if i do the following $ cd /usr/local/Cellar/opencv/3.4.3_1 and $ cd lib, I get (among others): python3.7.
Then I do the following:
$ cd python3.7 and then $ cd site-packages and $ pwd, I get: /usr/local/Cellar/opencv/3.4.3_1/lib/python3.7/site-packages
- add the cv2.<version>.so to System python
I enter then python with $ python3 and get
Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 03:03:55)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
Question N°1 Isn't it weird that it says version 3.6.5 and opencv seems to have a lib 3.7 (and no 3.6)
type >>> import sys and then >>> print(sys.path)and get the following list:
['', '/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages']
I then enter:
$ ln -s /usr/local/Cellar/opencv/3.4.3_1/lib/python3.7/site-packages/cv2.cpython-37m-darwin.so /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/cv2.so
- Add OpenCV to Virtualenvs
I then add the following command:
$ mkdir ~/Dev
$ cd ~/Dev
$ virtualenv -p python3 newcvtest
$ cd newcvtest
$ source bin/activate
(newcvtest) $ python --version
Python 3.6.5
$ pip install numpy
$ cd lib/python3.6/site-packages
$ ln -s /usr/local/Cellar/opencv/3.4.3_1/lib/python3.7/site-packages/cv2.cpython-37m-darwin.so
After that the installation should be finished. However I still get the same error message
What should I do?
