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I'm using ubuntu 18.04 and needed to install opencv 2.4 (to use the patented features that are not available in newer versions e.g SIFT, SURF). But whenever I install any version whether it's 2.4, 3.2 or even 3.4 and check for the version using python cv2.__version__ it outputs '3.2.0' and hence, can't use the patented functions.

So, is there a way of using the installed version 2.4 instead of 3.2, or do I need to uninstall and reinstall? I installed it by following this answer https://stackoverflow.com/a/18590112

EDIT

I didn't uninstall the previous version properly. The correct way to uninstall is 

$ cd ~/opencv/build
$ sudo make uninstall

then delete the opencv folder

islamamr
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  • the minor version number is the "2" in 3.2, not the one in 2.4 – Miki May 27 '20 at 11:09
  • Okay, excuse me for that. I'll edit the question – islamamr May 27 '20 at 11:10
  • also in 4.3.0 SIFT detector has been excluded from non-free algorithms set – Miki May 27 '20 at 11:10
  • But the problem lies in the fact that i always get the 3.2 version, no matter which version I download from the opencv website. Btw, I use the answer in this link https://answers.opencv.org/question/209088/how-to-completely-remove-opencv3/ to uninstall any version to try and reinstall another version. – islamamr May 27 '20 at 11:32

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