Star Detector, BRIEF and FREAK listed in nonfree modules [closed]

asked 2014-09-03 09:15:07 -0500

Doombot gravatar image

updated 2020-11-09 11:32:02 -0500

Looking for information on the aforementioned detectors, I noticed they are listed in the "Non-free 2D Features Algorithms" section of the OpenCV docs. See:

I thought only SURF and SIFT were non-free... Could someone confirm the info? It might be only an error in the title of the section, though!

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Closed for the following reason the question is answered, right answer was accepted by StevenPuttemans
close date 2014-09-05 03:29:59.723605



Mmm, maybe they have a different licence, but I don't know either.

Guanta gravatar imageGuanta ( 2014-09-03 09:37:20 -0500 )edit

If you look at the and click on non free modules (, only SURF and SIFT are non free. Your guess of a different licence seems plausible, but working for a small company I can't afford copyright infringement... ;)

Doombot gravatar imageDoombot ( 2014-09-03 10:10:20 -0500 )edit

Actually as I see it, there is simply a typo in the titel here. xfeatures2d stands for experimental features 2d, though nonfree moved to that module. So basically the first title is wrong and second one is correct. I will add a pull request in the near future to fix this.

StevenPuttemans gravatar imageStevenPuttemans ( 2014-09-04 08:40:34 -0500 )edit
2 here is the solution! Thank you for the report.

StevenPuttemans gravatar imageStevenPuttemans ( 2014-09-04 08:47:20 -0500 )edit

Pull request submitted. This can be marked as solved.

StevenPuttemans gravatar imageStevenPuttemans ( 2014-09-05 03:29:35 -0500 )edit