Find OpenCV Version Installed on Ubuntu [duplicate]

I would like to find out what version of OpenCV is installed on my computer (i am running Ubuntu 10.04). Is there a simple way to check it if ? If not then can i find out the directories where files (samples, etc) are installed ?

I am trying to run some code that i have already tested on another computer with OpenCV 2.3 installed and i get many errors.

The other methods here didn't work for me, so here's what does work in Ubuntu 12.04 'precise'.

On Ubuntu and other Debian-derived platforms, dpkg is the typical way to get software package versions. For more recent versions than the one that @Tio refers to, use

 dpkg -l | grep libopencv

If you have the development packages installed, like libopencv-core-dev, you'll probably have .pc files and can use pkg-config:

 pkg-config --modversion opencv

You can look at the headers or libs installed. pkg-config can tell you where they are:

pkg-config --cflags opencv
pkg-config --libs opencv

Alternatively you can write a simple program and print the following defs:

CV_MAJOR_VERSION
CV_MINOR_VERSION

A similar question has been also asked here:

1) Direct Answer: Try this:

   sudo updatedb
   locate OpenCVConfig.cmake

For me, I get:

   /home/pkarasev3/source/opencv/build/OpenCVConfig.cmake

To see the version, you can try:

   cat /home/pkarasev3/source/opencv/build/OpenCVConfig.cmake

giving

    ....
   SET(OpenCV_VERSION 2.3.1)
    ....

2) Better Answer:

"sudo make install" is your enemy, don't do that when you need to compile/update the library often and possibly debug step through it's internal functions. Notice how my config file is in a local build directory, not in /usr/something. You will avoid this confusion in the future, and can maintain several different versions even (debug and release, for example).

Edit: the reason this questions seems to arise often for OpenCV as opposed to other libraries is that it changes rather dramatically and fast between versions, and many of the operations are not so well-defined / well-constrained so you can't just rely on it to be a black-box like you do for something like libpng or libjpeg. Thus, better to not install it at all really, but just compile and link to the build folder.

There is also a flag CV_VERSION which will print out the full version of opencv

To install this product you can see this tutorial: OpenCV on Ubuntu

There are listed the packages you need. So, with:

# dpkg -l | grep libcv2
# dpkg -l | grep libhighgui2

and more listed in the url you can find which packages are installed.

With

# dpkg -L libcv2

you can check where are installed

This operative is used for all debian packages.