[Cin] OpenCV, again!

[Andrew Randrianasulu]

On Sunday, May 22, 2022, Phyllis Smith via Cin <cin at lists.cinelerra-gg.org>
wrote:

> Checked the 2 patches by Andrew into GIT.  Both 2018 and 2020 opencv
> versions work on Fedora 32 and Ubuntu 16 but I did not test on an older O/S
> that had the older cmake.
>
> PS: I was thinking that since compiling the latest version on git
>> works (4.5, on https://github.com/opencv/opencv.git), can we try
>> putting this in CinGG git? I mean instead of the current version 3.
>>
>> The whole reason for not updating OpenCV is because of licensing with the
> Surf algorithm which is necessary for FindObj to work well.  The later
> versions (at that time) had the Surf algorithm removed as no longer
> non-free.
>
>
At least here
https://github.com/opencv/opencv_contrib/blob/4.x/modules/xfeatures2d/src/surf.cpp


I still see #ifdef OPENCV_ENABLE_NONFREE

while may be patents for this exactly algo already expired?

ah no, only SIFT patent expired...

https://github.com/scikit-image/scikit-image/issues/4499





>
>  So if you can verify that Surf is again free and part of the released
> OpenCV version 4.5, then we can certainly upgrade and that would be very
> good.
>
>
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