Make error __atomic_fetch_add_8 on RaspberryPi4
Hello, I've been trying to compile OpenCV 4.1.1 on my RaspberryPi 4 running Rasbian Buster with Python 3.7. I use the following command for cmake running inside a build folder under opencv (as...
View ArticleTrouble building opencv4.1.1 on RHEL 6
Steps followed: -> Installed dependancies:python 2.7, python-devel, numpy, matplotlib, cmake, gcc, gcc-c++, tbb, tbb-devel, gtk2-devel, pkgconfig, ffmpeg-devel, gstreamer-plugins-base-devel, ->...
View ArticleOpenCV build for Mac Catalyst/iOS 13 iOS app on Mac support?
I have been trying to build openCV libraries which would be compatible for mac catalyst (iOS app built for Mac which is a new feature on iOS 13/Mac 10.15 beta) without much success. This is the command...
View ArticleWhich Qt 4 configuration options are needed by OpenCV?
We are compiling Qt 4 from source and using it as a private copy. Looking at the configuration banners, OpenCV seems to only be using a tiny fraction of Qt's functionality. E.g. stuff like network...
View ArticleAndroid 3.4.6 build from source
I'm going crazy trying to build and Android version from scratch again. It seems no matter what hoops I jump through, or old google tools I find there is always another error right around the corner....
View Articlecan't find libpthread_nonshared.a
I am trying to build opencv from source and I inserted cmake instructions, then when I enter make command, it reaches 11% and then shows the following error >> /usr/bin/ld: cannot find...
View ArticleBuild Raspbain Segmentation fault
OpenCV build fails with Segmentation fault. Does anyone has an idea why? CMake Command cmake -D CMAKE_BUILD_TYPE=RELEASE \ -D CMAKE_INSTALL_PREFIX=/usr/local \ -D...
View ArticleHow to link with OpenCV as cmake subdirectory
I have a project in which I manage most dependencies by tracking them with git submodules and then, where possible, adding them to a CMake build with `add_subdirectory`. I am having trouble getting...
View Articlefailed to compile OpenCV with CUDA at opencv_cudev module
Environment: - OS: Ubuntu 18.04 server - CUDA: 10.0 - GCC: 7.4.0 - CMake: 3.10.2 - Make: 4.1 CMake Configuration: ``` cmake ../opencv-4.1.1/ -LH -DCMAKE_BUILD_TYPE=Release -DWITH_GTK=OFF -DWITH_QT=OFF...
View ArticleInclude opencv contrib modules in opencv.js
Is it possible to include opencv contrib modules to opencv .js, please guide me if there is way to include opencv contrib modules in opencv.js.
View ArticleHas OpenCV been approved for safety critical applications?
a) Has anyone obtained approval for use of OpenCV in safety-critical applications, such as aircraft flight control? The rumor is that has been done within the unmanned vehicle space. Of course, it...
View ArticleGeany settings for user builds in RPi under Buster
Is there a set of suggested/recommended settings for Geany to work on the standard test cases after a successful build of 4.1.x on RPi (any) under Buster for C++ as well as Python? *Running into...
View ArticleRPi 3B+ setting OPENCV_ENABLE_NONFREE:BOOL=ON does not enable "non-free...
This question was asked before, but the solutions provided, eg....
View ArticleBuilding "Tracking" module in OpenCV extra modules with Cmake does not...
I am not able to get a working custom build for implementation of some OpenCV sample motion tracking examples which requires the module "tracking" part of **opencv_contrib**. I tried to custom build...
View ArticleBuilding Error VS 2017
Hi I have some trouble with building my opencv on a windows. I will attache the CMAKE log file and the Output build from VS2017. Please rename the files to .txt...
View ArticleHow to add openMP changes openCV source (eg. DetectMultiscale function))
I have read some research papers (https://ieeexplore.ieee.org/document/7362651 , ) wherein they added changes to OpenCV functions (DetectMultiscale, DetectSinglescale) to achieve execution time...
View ArticleTest Changes in forked repo
Is it necessary to build and install all the modules of my forked repo so that any changes I have made are reflected in the my programs? I am using Cmake to build and install the modules on a Linux...
View ArticleError building opencv with sfm module
Hy, I have download the opencv and opencv_contrib sources from git and I'm trying to build opencv with the sfm module. I have already download, build and install Eigen, gflags, glog and ceres. When...
View ArticleBuild OpenCV 4.x for Android with c++_static
I had been happily using opencv as a shared library, but now I want to try out this open source project where they link to it statically. The only problem is google stopped supporting gnustl and gcc....
View Articleopen_cv build fails
Some initial information: - Windows 7 Visual Studio 16 2019 - OpenCV 3.4.9 - CUDA 10.1 - CMake 3.16.2 - GTX 780 (compute capability up to 3.5) After generating the project in cmake and building it in...
View ArticleOpenCV build for Windows x64/Python3.7 from source. Where is the .pyd file?
CMake is AFAICT correctly configured and producing the usual .DLL files in build/bin/Debug (as that is the configuration I'd like). The settings for Python3 have the correct directories and BUILD_XXX...
View ArticleSite_packages not updated after Windows Build of Open CV
I completed building OpenCV on Windows 10. All steps are successful but Site_Packages are not updated, Can you please help
View ArticleBuild fails in nvidia docker; cuda:9.2-cudnn7-devel-ubuntu16.04
got following error when install opencv in nvidia docker; nvidia/cuda:9.2-cudnn7-devel-ubuntu16.04 > [ 30%] Building NVCC (Device) object...
View ArticleBuild OpenCV 3.4 for python 3.6 on ubuntu
Lately, I have been contributing to opencv 3.4 branch. I am facing trouble building 3.4 branch locally, 4.2 is getting build successfully. Here is the status of my branches when I checkout master...
View ArticleChanges in PR not getting build on custom builders
I have pushed a PR #16750 (https://github.com/opencv/opencv/pull/16750) where command is already added in description to build on custom builders. Xforce_builders=Custom,Custom Win,Custom Mac...
View ArticleHow to get static libs for installed modules?
I am building OpenCV from source on Windows 10. I have downloaded 'opencv' and 'opencv_contrib' from Github and used the CMake GUI to configure it to build, then opened the solution in Visual Studio...
View ArticleTest failure with opencv_perf_tracking
Hi, I'm running a "make test" with an OpenCV 4.3.0 build against GCC 7.3, CUDA 10.0, and MKL 2019.5. Most tests are passing, but the next one I'm trying to pass is generating errors like Do I need to...
View ArticleHow to add python2 to pre-built OpenCV?
Hello I have built OpenCV from source with Python3 enabled. Now I want to add Python2 as well. Is there any way to avoid re-building the whole Library? I guess there might be a way because only the...
View Articlewhich version of OpenCV includes x86(32-bit) lib files? how should I use it?
I want to create project with OpenCV in Windows using visual studio also i want to build my project as x86(Win32) program. When I compile the program errors occur that show I don't have appropriate x86...
View ArticleOpencv-Python built for Windows x64 Python 3.7, .pyd file not found, OpenCV...
I'm trying to build opencv-python with cuda. Despite following a few guide, i still can't get it....
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