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A comment on The patent on SIFT expired yesterday.

Re:The patent on SIFT expired yesterday by chewxy on Sunday March 08, 2020 @10:25PM (#22522383)
TIL SIFT was patented. I wonder if SURF was as well. Not that it matters nowadays
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Re:The patent on SIFT expired yesterday by throwlaplace on Sunday March 08, 2020 @11:40PM (#22522801)
yes it is

>In computer vision, speeded up robust features (SURF) is a patented local feature detector and descriptor.

https://en.m.wikipedia.org/wiki/Speeded_up_robust_features

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