'fatal error: opencv2/xfeatures2d.hpp: No such file or directory

I am trying to build this code: https://docs.opencv.org/3.2.0/d5/d6f/tutorial_feature_flann_matcher.html

I am using Ubuntu 16.04 with CLion 2017.3 and have OpenCV 3.4 installed.

xfeatures2d.hpp can't be found on the system.

I have looked at many different problems on the internet, but couldn't find a solution.

Any help?

Solution 1:^[1]

You have to include cmake comiplation flag to opencv OPENCV_EXTRA_MODULES_PATH and set it to the opencv_contrib/modules.

cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules

Solution 2:^[2]

Here's what I had to do to compile OpenCV with xfeatures2d:

Download opencv_contrib (I took a release from the releases page). This step is what gives us xfeatures2d.
Unpack the tarball somewhere, e.g., ~/src/opencv_contrib-4.5.5
When configuring OpenCV (the main OpenCV source like opencv-4.5.2) with CMake, add the following option to cmake command line (adjusting the value to be your actual path to the modules subdirectory of the opencv_contrib tarball):

-DOPENCV_EXTRA_MODULES_PATH=$HOME/src/opencv_contrib-4.5.5/modules/

Now just build as you normally would and install.

The above actions gave me the expected file (among others): /usr/include/opencv4/opencv2/xfeatures2d.hpp.

Sources

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Source: Stack Overflow

Solution	Source
Solution 1	craken
Solution 2	Ruslan

'fatal error: opencv2/xfeatures2d.hpp: No such file or directory

Solution 1:[1]

Solution 2:[2]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]