How to determine OpenCV version

Question

How to determine which version of OpenCV I have installed?

I am most interested in knowing a way of doing it programatically (and cross-platform), but I can

Answer 1

pkg-config --modversion opencv

Answer 2

I would like to enhance one of the answers using version.hpp defines.

Please notice the potential problem with that solution:

v. 2.4.13.6 defines:

#define CV_VERSION_EPOCH 2
#define CV_VERSION_MAJOR 4
#define CV_VERSION_MINOR 13
#define CV_VERSION_REVISION 6
#if CV_VERSION_REVISION
#  define CV_VERSION    CVAUX_STR(CV_VERSION_EPOCH) "." CVAUX_STR(CV_VERSION_MAJOR) "." CVAUX_STR(CV_VERSION_MINOR) "." CVAUX_STR(CV_VERSION_REVISION)
#else
#  define CV_VERSION        CVAUX_STR(CV_VERSION_EPOCH) "." CVAUX_STR(CV_VERSION_MAJOR) "." CVAUX_STR(CV_VERSION_MINOR)
#endif

and v. 3.4.2 defines:

#define CV_VERSION_MAJOR 3
#define CV_VERSION_MINOR 4
#define CV_VERSION_REVISION 2
#define CV_VERSION    CVAUX_STR(CV_VERSION_MAJOR) "." CVAUX_STR(CV_VERSION_MINOR) "." CVAUX_STR(CV_VERSION_REVISION) CV_VERSION_STATUS

As a result, CV_VERSION_MAJOR are not comparable. Much safer solution is to parse CV_VERSION and use the first value before a dot.

Answer 3

if you are working under Windows and you need to configure Codeblocks or any other IDE (thus,you can not issue any command yet nor compile a program ) you can simply go to the folder of installation of OpenCV and look after the final leters of the libraries in the sub-folder "/lib" .All libraries there are named in a pattern that reflects the major,minor and the revision of the build of OpenCV.For instance if you stumble upon a file named opencv_ts300.lib or opencv_world300.lib then the major is 3,minor is 0 and revision is 0.

(Note: it's likely that this method fails I mean when these informations do not comply with the real version but this will be maybe with the revision but unlikely with the major)

Answer 4

You can check the following macro variables:

CV_MAJOR_VERSION
CV_MINOR_VERSION

Answer 5

You can check the CV_VERSION macro.

Answer 6

The version string is located in:

https://github.com/opencv/opencv/blob/master/modules/core/include/opencv2/core/version.hpp

Top of version.hpp, below the BSD license:
#define CV_VERSION_MAJOR    3
#define CV_VERSION_MINOR    2
#define CV_VERSION_REVISION 0