[Cin] OpenCV, again!

[Andrew Randrianasulu]

On Sunday, May 22, 2022, Andrew Randrianasulu <randrianasulu at gmail.com>
wrote:

>
>
> 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
>



https://github.com/herbertbay/SURF/blob/master/LICENSE

to be honest licence sounds a bit contradicting itself?

====
Permission to use, copy, modify, and distribute this software and
its documentation for educational, research, and non-commercial
purposes, without fee and without a signed licensing agreement, is
hereby granted, provided that the above copyright notice and this
paragraph appear in all copies modifications, and distributions.

Any commercial use or any redistribution of this software
requires a license from one of the above mentioned establishments.

For further details, contact Herbert Bay (herbert.bay at gmail.com).

=====


how can 'any redistribution' be prohibited if it granted permussion to use,
modify and _distribute_ this software forb(research/education) ... and
non-commercial purposes?

>
>
>
>
>
>>
>>  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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