sift algorithm for opencv 4.1

Question

I am executing statement sift = cv2.xfeatures2d.SIFT_create(). It is working fine with OpenCV 3.4 but I want to execute it with the OpenCV version 4.1.

I am getting the following error:

Message=OpenCV(4.1.1) D:\Build\OpenCV\opencv_contrib-4.1.1\modules\xfeatures2d\src\sift.cpp:1207: error: (-213:The function/feature is not implemented) This algorithm is patented and is excluded in this configuration; Set OPENCV_ENABLE_NONFREE CMake option and rebuild the library in function 'cv:

And which part of the error message don't you understand?

HansHirse
– HansHirse

2019-09-27 10:10:08 +00:00
Commented Sep 27, 2019 at 10:10 — HansHirse
– HansHirse, Commented Sep 27, 2019 at 10:10

Piotr Siekański · Accepted Answer · 2019-09-27 10:51:43Z

3

As SIFT is patented in the USA to enable it in OpenCV you have to compile OpenCV from source with contrib modules and explicity set the flag OPENCV_ENABLE_NONFREE while configuring your project in CMake.

See this question for more information.

edited Sep 27, 2019 at 10:51

answered Sep 27, 2019 at 10:18

Piotr Siekański

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