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

[suljaxm]

I installed opencv4.1.0 but when I ran the project, I couldn't find xfeatures2d.hpp.

the error is

matching2D.hpp:16:35: fatal error: opencv2/xfeatures2d.hpp: No such file or directory
 #include <opencv2/xfeatures2d.hpp>
                                   ^
compilation terminated.
CMakeFiles/2D_feature_tracking.dir/build.make:62: recipe for target 'CMakeFiles/2D_feature_tracking.dir/src/matching2D_Student.cpp.o' failed
make[2]: *** [CMakeFiles/2D_feature_tracking.dir/src/matching2D_Student.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/2D_feature_tracking.dir/all' failed
make[1]: *** [CMakeFiles/2D_feature_tracking.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

What should I do?

[roman-smirnov]

see this issue opencv/opencv_contrib#1301

[suljaxm]

Thanks, I added opencv_contrib and it is still compiling.

-DOPENCV_EXTRA_MODULES_PATH=<opencv_contrib>/modules <opencv_source_directory>

I was curious why add opencv_contrib because I also saw features2d in opencv-4.1.0\module.

[AmbatiHemasree]

Hi, The same issue has occurred to me. But i dont the xfeaures2d module as my application is not on that. How could i disable this? Please suggest me with a solution

Thanks and regards!

[yihe2018]

@AmbatiHemasree -DBUILD_opencv_xfeatures2d=OFF
in cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/home/heyi/Myir/Tools/opencv-3.4.1 -D OPENCV_EXTRA_MODULES_PATH=/home/heyi/Myir/Tools/opencv_contrib-3.4.1/modules/ -DBUILD_opencv_xfeatures2d=OFF -D CMAKE_TOOLCHAIN_FILE=arm-linux-gnueabihf.cmake ..

[Shivani1796]

opencv2/xfeatures2d.hpp: No such file or directory.

Can anyone help solve this issue.

[Nuri-benbarka]

The xfeatures2d.hpp file is in the OpenCV contrib repository, so I guess you need to install the OpenCV library with the modules in the OpenCV contrib repository. Check this link for installation guidance:
https://docs.opencv.org/trunk/d7/d9f/tutorial_linux_install.html

[jaytxrx]

You need to download the opencv_contrib package and reinstall opencv
Below steps were tried on Ubuntu 20.04

Note: if you already have OpenCV installed, then do from step 2. In step 3, your build directory might already have files, you can delete them

1. If you have not installed OpenCV, follow the below steps

git clone https://github.com/opencv/opencv.git
cd opencv
git checkout 4.1.0
cd .. #get out of opencv folder

2. now get opencv_contrib

https://github.com/opencv/opencv_contrib/
cd opencv_contrib
git checkout 4.1.0
cd .. #get out of opencv_contrib folder

3. lets create a build directory inside opencv folder and install opencv where we will refer opencv_contrib

cd opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE -D OPENCV_ENABLE_NONFREE=ON -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules -D WITH_GTK=ON ..
make
sudo make install

[pkeir]

On Ubuntu 20.10 the libopencv-features2d-dev package includes features/features2d.hpp, but not xfeatures2d.hpp (as reported by dpkg -L libopencv-features2d-dev). libopencv-contrib-dev also doesn't have it. I don't know what the 'x' signifies.

[SudKul]

Intentionally keeping this thread open to help new students.

Though we encourage such user-specific issues to be raised on the Knowledge hub so that our experienced mentors can chime-in and new students can also learn from the discussion thread.

Thanks, @jeffreyantony, and @Nuri-benbarka for pointing out the missing step

[ok-kewei]

You need to download the opencv_contrib package and reinstall opencv Below steps were tried on Ubuntu 20.04

Note: if you already have OpenCV installed, then do from step 2. In step 3, your build directory might already have files, you can delete them

1. If you have not installed OpenCV, follow the below steps

git clone https://github.com/opencv/opencv.git
cd opencv
git checkout 4.1.0
cd .. #get out of opencv folder

2. now get opencv_contrib

https://github.com/opencv/opencv_contrib/
cd opencv_contrib
git checkout 4.1.0
cd .. #get out of opencv_contrib folder

3. lets create a build directory inside opencv folder and install opencv where we will refer opencv_contrib

cd opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE -D OPENCV_ENABLE_NONFREE=ON -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules -D WITH_GTK=ON ..
make
sudo make install

Thanks for sharing. It works for me at Ubuntu 18.04 <3
My experience told the opencv and opencv_contrib both have to be in the same version.
Reference: https://answers.opencv.org/question/221263/make-error-about-opencv_contrib-348/