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Expired US patent on SIFT

asked 2020-11-29 17:25:20 -0500

I am a new user of OpenCV.

I am suprised why SIFT is not avaliable in OpenCV.

The only patent for SIFT algoritm is; David G. Lowe, US Patent 6,711,293. Provisional application filed March 8, 1999. Asignee: The University of British Columbia

This patent has been EXPIRED in March 7, 2020*.

Currently there is no legal restriction OpenCV to include SIFT algoritm.

My question; Is there any other legal restriction or only OpenCv developers miss the patent expire date ?

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Which opencv version? -Update your code read https://github.com/opencv/opencv/pull...

LBerger gravatar imageLBerger ( 2020-11-29 20:12:42 -0500 )edit

open CV 4.4.0

rafetirmak gravatar imagerafetirmak ( 2020-11-30 15:32:49 -0500 )edit

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answered 2020-11-30 02:11:53 -0500

berak gravatar image

updated 2020-11-30 02:13:48 -0500

indeed, the patent expired, so SIFT could be moved away from the nonfree xfeatures2d module in the opencv_contrib repo.

opencv versions from 4.4.0 or 3.4.11 onwards have it in the features2d module in the main repo, and there are no restrictions to use it.

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This should be GREAT ;

"indeed, the patent expired, so SIFT could be moved away from the nonfree xfeatures2d module in the opencv_contrib repo."

rafetirmak gravatar imagerafetirmak ( 2020-11-30 15:33:39 -0500 )edit

let me clarify again, it was moved into the main repo in 4.4, and you can freely use it.

berak gravatar imageberak ( 2020-12-03 09:38:43 -0500 )edit

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Asked: 2020-11-29 17:25:20 -0500

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Last updated: Nov 30 '20