I'm currently working on a study comparing the performance of different operating systems in image processing.
Because of this, i have to install OpenCV 2.4.x (2.4.3 preferably) on a FreeBSD system.
The problem is that it includes asm/types.h, which is not a POSIX-compliant library but rather a Linux one.
So i run cmake with the standard flags suggested by the install guide:
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
Where .. points correctly to the source folder. Everything goes ok, so i run make:
[ 16%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_libv4l.cpp.o
/root/work/OpenCV-2.4.3/modules/highgui/src/cap_libv4l.cpp:238:54: error: asm/types.h: No such file or directory
The question is: what should i do in order to tell the compiler that it needs to include another header instead of the original header file?
This problem was addressed at Bug#651872: opencv: FTBFS on kfreebsd
In modules/highgui/src/cap_libv4l.cpp, remove or comment out the following include:
#include <asm/types.h>
Do the same in modules/highgui/src/cap_v4l.cpp.
Related
I have been troubling with changing version of opencv. I deleted old version of it for some reason and installed new version follow this site:
https://docs.opencv.org/master/d7/d9f/tutorial_linux_install.html
my cmake parameters are as follows:
cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_GENERATE_PKGCONFIG=ON -D WITH_CUDA=ON -D OPENCV_DNN_CUDA=ON -D OPENCV_EXTRA_MODULES_PATH=/home/robotics/opencv_contrib/modules ..
and now I realized that I can not catkin_make. the error message is below:
CMake Error at /usr/share/OpenCV/OpenCVModules.cmake:179 (message):
The imported target "opencv_core" references the file
"/usr/lib/libopencv_core.so.3.3.1"
but this file does not exist. Possible reasons include:
The file was deleted, renamed, or moved to another location.
An install or uninstall procedure did not complete successfully.
The installation package was faulty and contained
"/usr/share/OpenCV/OpenCVModules.cmake"
but not all the files it references.
I think the problem is that cmake is still searching old version of opencv I installed by package, but I don't know how to change that path to new opencv I installed is any idea can allow me to edit this path? Or any way to install opencv with path set correctly? Thank you!
I am new to Ubuntu and OpenCV. Apologies for my amateurishness.
I think I messed up OpenCV installation.
I had installed OpenCV 2.4 months back. The installation was successful (built openCV from source using CMake)
Couple of days back I had also installed OpenCV 3.0 using the same procedure.
The problem began when one of my code gave a segmentation fault for seemingly no reason. On suggestion by a friend on Caffe Neural Network issues forum (https://github.com/BVLC/caffe/issues/3416), it seems that I am compiling with 3.0 headers but linking against the 2.4 libraries.
I checked /usr/local/include. It has the standard openCv header files ( I didn't understand what 'compiling with 3.0 header means' )
In /usr/local/lib I have OpenCV 3.0 libraries ( no 2.4.8 at all).
Now compilation was successful, but when I try to run it, I get the following error.
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff76c49bc in cv::merge(cv::_InputArray const&,
cv::_OutputArray const&) ()
from /usr/lib/x86_64-linux-gnu/libopencv_core.so.2.4
Just to add
"pkg-config --modversion opencv"
3.0.0
whereas dpkg -l | grep libopencv
gave out
i libopencv-calib3d-dev:amd64 2.4.8+dfsg1-2ubuntu1 amd64 development files for libopencv-calib3d
ii libopencv-calib3d2.4:amd64 2.4.8+dfsg1-2ubuntu1 amd64 computer vision Camera Calibration library
ii libopencv-contrib-dev:amd64 2.4.8+dfsg1-2ubuntu1 amd64 development files for libopencv-contrib
.......
q.1> why does my code link to libopencv_core.so.2.4 instead of 3.0. I have checked in /usr/local/lib and did not see a single 2.4 library. I have tried manually defining links to header files and libraries in CMake but still same result.
q.2> Do OpenCV headers have a version number? I don't understand how they are called '2.4 headers'. I have checked the source code but did not see any specific requirement for a version of library. Then what dictates to link to 2.4 version libraries?
Sorry if this is theoretical but this would be highly beneficial to beginners like me. Please do comment for a suitable question title if the current one is not appropriate.
Thanks
Your opencv2.4 libraries are located in /usr/lib/x86_64-linux-gnu/ while the new opencv3 libraries are most likely located in /usr/local/lib. The linker is first looking in the /usr/lib/x86_64-linux-gnu/ directory, and thus finding the opencv2.4 libs first. To fix this you can tell the linker to look in /usr/local/lib first by adding the following to your ~/.bashrc file
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
Reload the bashrc file in the terminal as follows (or simply close and re-open the terminal):
source ~/.bashrc
And update the library database:
sudo ldconfig
To check the order in which the linker will search for libraries, you can use the following:
ld -lopencv_core --verbose | grep attempt
I wanted to use the "extra" modules, that come as opencv_contrib from here for other functions of opencv 3.0. I followed the instructions as per the page, for building and compiling the modules, but am stuck with this error
Command:
cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..
Error:
<Skipping the common Cmake statements and going straight to the error>
CMake Error at opencv_contrib/modules/adas/tools/fcw_train/CMakeLists.txt:16 (ocv_include_modules_recurse):
Unknown CMake command "ocv_include_modules_recurse".
-- Configuring incomplete, errors occurred!
I checked the CMakeLists.txt as mentioned in the path and there were other lines of code that had ocv_xxx , thus it was not a rename issue (I thought they misspelt opencv).
This is my folder structure:
Opencv
- build
- opencv_contrib
This is to verify if my CMake command was correct, as I had posted above.
Can you please tell me how to rectify this error?
UPDATE 1
As per a suggestion, I tried,by putting the opencv_contrib folder outside the opencv folder structure. The new structure was like this
-Opencv
- build
-opencv_contrib
and my new command was
cmake -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules ..
the error is still the same.
Fixed it, thanks to this question. From that question, I understood that the value of the argument should be correct, to turn on the build or something like that. So I changed my command from
cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..
to
cmake -DOPENCV_EXTRA_MODULES_PATH=opencv_contrib/modules .
Plain and simple, without hierarchy information and it worked. Cheers.
I am compiling a dependency for a project on Ubuntu 10.10, and instead of having it install to /usr/local by default, I am instead installing it to /tmp/stage/usr/local. How do I go about informing CMake of the location of this custom installed dependency when I call it to generate the build files for said project.
I am running CMake 2.8.1, and I have tried to set CMAKE_PREFIX_PATH on the cmake command line, like so
cmake -D CMAKE_PREFIX_PATH=/tmp/stage/usr/local
but this doesn't seem to make a difference - the project doesn't seem to detect the dependency.
Also, if it matters, the project in question is OpenCV 2.2, and the dependency in question is FFMPEG...
I figured out how to fix my problem, and trying to point CMake at the appropriate install location isn't the issue.
Apparently, CMake is unable to find the pkg-config files for FFMPEG (i.e. libavcodec.pc, libavdevice.pc, etc.) that tell it where the FFMPEG headers and libraries are located. In a typical install scenario, these files would be located at /usr/lib/pkgconfig. However because of the custom install location, they are instead located at /tmp/stage/usr/local/lib/pkgconfig.
So that CMake could find these files, I had to add the following environment variable:
export PKG_CONFIG_PATH=/tmp/stage/usr/local/lib/pkgconfig
After which point, OpenCV built against FFMPEG as expected.
I am trying to build Erlang on Solaris 10. The build process fails with the message that it can not find libncurses.so.5.
I have installed libncurses from sunfreeware.com, which I have build from scratch and has installed itself in /usr/local/lib/.
I have tried to set LDFLAGS with -L/usr/local/lib/ but have still had no luck.
What am I missing so that make picks up the library?
I am using GNU Make 3.81 and GCC 3.4.6.
Could you post the relevant bit from config.log?
Did you also set the include path with -I in either CPPFLAGS or CFLAGS?
Update: You could also try installing Erlang from OpenCSW instead.