In this tutorial, we will introduce a quick way to check your OpenCV build settings.
If you have ever compiled or installed OpenCV, you know it can be compiled with an overwhelming number of options. For example, when installed on MacOS with Homebrew, OpenCV3 has the following options.
$ brew options opencv3
--c++11
Build using C++11 mode
--with-contrib
Build "extra" contributed modules
--with-cuda
Build with CUDA v7.0+ support
--with-examples
Install C and python examples (sources)
--with-ffmpeg
Build with ffmpeg support
--with-gphoto2
Build with gphoto2 support
--with-gstreamer
Build with gstreamer support
--with-jasper
Build with jasper support
--with-java
Build with Java support
--with-jpeg-turbo
Build with libjpeg-turbo instead of libjpeg
--with-libdc1394
Build with libdc1394 support
--with-nonfree
Enable non-free algorithms
--with-opengl
Build with OpenGL support (must use --with-qt)
--with-openni
Build with openni support
--with-openni2
Build with openni2 support
--with-python3
Build with python3 support
--with-qt
Build the Qt backend to HighGUI
--with-quicktime
Use QuickTime for Video I/O instead of QTKit
--with-static
Build static libraries
--with-tbb
Enable parallel code in OpenCV using Intel TBB
--with-vtk
Build with vtk support
--without-eigen
Build without eigen support
--without-numpy
Use a numpy you've installed yourself instead of a Homebrew-packaged numpy
--without-opencl
Disable GPU code in OpenCV using OpenCL
--without-openexr
Build without openexr support
--without-python
Build without Python support
--without-test
Build without accuracy & performance tests
--HEAD
Install HEAD version
It can be mind numbing to figure out what option you had used while compiling or installing OpenCV.
I had written a detailed post earlier on how to find OpenCV version.
But if you want the full build information, you need to use getBuildInformation. The usage is straightforward.
The C++ and Python code are listed below.
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How to find OpenCV build information using C++ ?
The code for obtaining build information is shared below.
#include <opencv2/opencv.hpp>
int main(void)
{
std::cout << cv::getBuildInformation() << std::endl;
}
How to find OpenCV build information using Python?
The code for obtaining build information using python is shared below.
import cv2
print cv2.getBuildInformation()
Output of getBuildInformation
I have shared an example of getBuildInformation output below. This is very useful to share when asking questions in a forum.
General configuration for OpenCV 3.2.0 =====================================
Version control: unknown
Extra modules:
Location (extra): /tmp/opencv3-20170521-37568-15s9x5w/opencv-3.2.0/opencv_contrib/modules
Version control (extra): unknown
Platform:
Timestamp: 2017-05-21T18:48:31Z
Host: Darwin 16.6.0 x86_64
CMake: 3.8.1
CMake generator: Unix Makefiles
CMake build tool: /usr/local/Homebrew/Library/Homebrew/shims/super/gmake
Configuration: Release
C/C++:
Built as dynamic libs?: YES
C++ Compiler: /usr/local/Homebrew/Library/Homebrew/shims/super/clang++ (ver 8.1.0.8020042)
C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -fno-omit-frame-pointer -msse -msse2 -mavx -mavx2 -fvisibility=hidden -fvisibility-inlines-hidden -mf16c -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -fno-omit-frame-pointer -msse -msse2 -mavx -mavx2 -fvisibility=hidden -fvisibility-inlines-hidden -mf16c -g -O0 -DDEBUG -D_DEBUG
C Compiler: /usr/local/Homebrew/Library/Homebrew/shims/super/clang
C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -fno-omit-frame-pointer -msse -msse2 -mavx -mavx2 -fvisibility=hidden -fvisibility-inlines-hidden -mf16c -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -fno-omit-frame-pointer -msse -msse2 -mavx -mavx2 -fvisibility=hidden -fvisibility-inlines-hidden -mf16c -g -O0 -DDEBUG -D_DEBUG
Linker flags (Release):
Linker flags (Debug):
ccache: NO
Precompiled headers: NO
Extra dependencies: -framework OpenCL /usr/local/opt/jpeg/lib/libjpeg.dylib /usr/local/lib/libpng.dylib /usr/local/lib/libtiff.dylib /usr/local/lib/libImath.dylib /usr/local/lib/libIlmImf.dylib /usr/local/lib/libIex.dylib /usr/local/lib/libHalf.dylib /usr/local/lib/libIlmThread.dylib avcodec avformat avutil swscale avresample -framework VideoDecodeAcceleration bz2 -framework Cocoa -framework AVFoundation -framework CoreGraphics -framework CoreMedia -framework CoreVideo -framework QuartzCore /usr/local/lib/libhdf5.dylib /usr/local/lib/libsz.dylib /usr/lib/libz.dylib /usr/lib/libdl.dylib /usr/lib/libm.dylib /usr/local/lib/libtesseract.dylib /usr/local/lib/liblept.dylib tbb -framework Accelerate
3rdparty dependencies: libwebp libprotobuf
OpenCV modules:
To be built: core flann hdf imgproc ml photo reg surface_matching video dnn fuzzy imgcodecs shape videoio highgui objdetect plot superres xobjdetect xphoto bgsegm bioinspired dpm face features2d line_descriptor saliency text calib3d ccalib datasets rgbd stereo tracking videostab xfeatures2d ximgproc aruco optflow phase_unwrapping stitching structured_light matlab python2
Disabled: world contrib_world
Disabled by dependency: -
Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python3 ts viz cnn_3dobj cvv freetype sfm
GUI:
QT: NO
Cocoa: YES
OpenGL support: NO
VTK support: NO
Media I/O:
ZLib: /usr/lib/libz.dylib (ver 1.2.8)
JPEG: /usr/local/opt/jpeg/lib/libjpeg.dylib (ver 80)
WEBP: build (ver 0.3.1)
PNG: /usr/local/lib/libpng.dylib (ver 1.6.29)
TIFF: /usr/local/lib/libtiff.dylib (ver 42 - 4.0.7)
JPEG 2000: NO
OpenEXR: /usr/local/lib/libImath.dylib /usr/local/lib/libIlmImf.dylib /usr/local/lib/libIex.dylib /usr/local/lib/libHalf.dylib /usr/local/lib/libIlmThread.dylib (ver 2.2.0)
GDAL: NO
GDCM: NO
Video I/O:
DC1394 1.x: NO
DC1394 2.x: NO
FFMPEG: YES
avcodec: YES (ver 57.89.100)
avformat: YES (ver 57.71.100)
avutil: YES (ver 55.58.100)
swscale: YES (ver 4.6.100)
avresample: YES (ver 3.5.0)
GStreamer: NO
OpenNI: NO
OpenNI PrimeSensor Modules: NO
OpenNI2: NO
PvAPI: NO
GigEVisionSDK: NO
Aravis SDK: NO
AVFoundation: YES
V4L/V4L2: NO/NO
XIMEA: NO
gPhoto2: NO
Parallel framework: TBB (ver 2017.0 interface 9106)
Other third-party libraries:
Use IPP: 9.0.1 [9.0.1]
at: /tmp/opencv3-20170521-37568-15s9x5w/opencv-3.2.0/macbuild/3rdparty/ippicv/ippicv_osx
Use IPP Async: NO
Use VA: NO
Use Intel VA-API/OpenCL: NO
Use Lapack: YES (-framework Accelerate)
Use Eigen: YES (ver 3.3.3)
Use Cuda: NO
Use OpenCL: YES
Use OpenVX: NO
Use custom HAL: NO
OpenCL: <Link with OpenCL library>
Include path: /usr/local/include /usr/local/include
Link libraries: -framework OpenCL
Use AMDFFT: YES
Use AMDBLAS: YES
Python 2:
Interpreter: /usr/bin/python (ver 2.7.10)
Libraries: /System/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib (ver 2.7.10)
numpy: /usr/local/lib/python2.7/site-packages/numpy/core/include (ver 1.12.1)
packages path: lib/python2.7/site-packages
Python 3:
Interpreter: /usr/local/bin/python3 (ver 3.6.1)
Python (for build): /usr/bin/python
Java:
ant: NO
JNI: /Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/include /Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/include/darwin /Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/include
Java wrappers: NO
Java tests: NO
Matlab:
mex: /Applications/MATLAB_R2016b.app/bin/mex
Compiler/generator: Working
Documentation:
Doxygen: /usr/local/bin/doxygen (ver 1.8.11)
Tests and samples:
Tests: NO
Performance tests: NO
C/C++ Examples: NO
Install path: /usr/local/Cellar/opencv3/3.2.0
cvconfig.h is in: /tmp/opencv3-20170521-37568-15s9x5w/opencv-3.2.0/macbuild
-----------------------------------------------------------------
Thanks for the tutorial
I intel TBB with command $ sudo apt-get install libtbb-dev and in the cmake I gave -D WITH_TBB=ON
-D BUILD_TBB=ON
but when i print cv2.getBuildInformation() it says the parallel framework is pthreads and not TBB.
Am I missing something ?
Thanks in advance