why

[chuichuiY]

[xukuanHIT]

@chuichuiY Hi, have you installed OpenCV?

[chuichuiY]

@chuichuiY你好，你安装了OpenCV吗？

yes,I downloaded opencv4.2.0 and this problem occurred when compiling AIRSLAM.

[xukuanHIT]

OpenCV is not found when compiling DBoW2. Can you check your installation of the OpenCV? For example, can you find the path of OpenCV ".hpp" and ".so" files on your computer?

[chuichuiY]

[xukuanHIT]

They are building results. Have you installed them?

[chuichuiY]

OpenCV is not found when compiling DBoW2. Can you check your installation of the OpenCV? For example, can you find the path of OpenCV ".hpp" and ".so" files on your computer?

opencv4.x only has the opencv.hpp file

[xukuanHIT]

@chuichuiY https://docs.opencv.org/4.x/d7/d9f/tutorial_linux_install.html

[chuichuiY]

They are building results. Have you installed them?

[xukuanHIT]

Can you find opencv2/opencv.hpp?

[chuichuiY]

Can you find opencv2/opencv.hpp?

yes ,@WP:~/opencv-4.2.0/include/opencv2/opencv.hpp

[xukuanHIT]

OK, can you find the OpenCVConfig*.cmake in /usr/local/cmake/opencv4?

[chuichuiY]

OK, can you find the OpenCVConfig*.cmake in /usr/local/cmake/opencv4?

/usr/local/stow/absl/lib/cmake/opencv4/OpenCVConfig-version.cmake
/usr/local/stow/absl/lib/cmake/opencv4/OpenCVConfig.cmake

[xukuanHIT]

I am not sure why the Cmakelist can not find your opencv. You can set the path in the Cmakelist using "set(OpenCV_DIR /usr/local/stow/absl/lib/cmake/opencv4)". You can also create a small project to test whether your opencv can be linked correctly.

[chuichuiY]

I am not sure why the Cmakelist can not find your opencv. You can set the path in the Cmakelist using "set(OpenCV_DIR /usr/local/stow/absl/lib/cmake/opencv4)". You can also create a small project to test whether your opencv can be linked correctly.

Thank you so much. It is true that DBOW2 cannot find my opencv, and it can be compiled successfully after modification. I would like to ask what data sets this can run on, and do I need to use rosbag to run it?

[chuichuiY]

[xukuanHIT]

Please use the original dataset. We use the image name to get the time stamp

[chuichuiY]

Is this error due to the data set? I changed the name of the MH01 data and the .launch file as required.

[xukuanHIT]

Please use the original dataset. Don't change the image name.