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just believe the errormsg.

the nonfree SIFT,SURF and the b3dm denoising algos can only be used, if you explicitly enable it.

you need to add: -DOPENCV_ENABLE_NONFREE=ON to your cmake flags, and rerun cmake && make && make install

just believe the errormsg.

the nonfree SIFT,SURF and the b3dm denoising algos can only be used, if you explicitly enable it.

you need to add: -DOPENCV_ENABLE_NONFREE=ON to your cmake flags, and rerun cmake && make && make install

(and it is OPENCV_ENABLE_NONFREE, not BUILD_OPENCV_ENABLE_NONFREE !)