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** The [https://patents.google.com/patent/US6711293B1/en patent for SIFT] expired on March 6, 2020 so it might be added to opencv-contrib-python in a future update. | ** The [https://patents.google.com/patent/US6711293B1/en patent for SIFT] expired on March 6, 2020 so it might be added to opencv-contrib-python in a future update. | ||
** The [https://patents.google.com/patent/US20090238460A1/en patent for SURF] should expire around 2029. | ** The [https://patents.google.com/patent/US20090238460A1/en patent for SURF] should expire around 2029. | ||
* You can use <code>opencv-python</code> if you do not need extra contrib modules. | |||
=== Non-free Algorithms === | === Non-free Algorithms === |