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It is free software and provides a rich API in C, C , Java and Python. The library itself is platform-independent and often used for real-time image processing and computer vision.Ubuntu's latest incarnation, Utopic Unicorn, comes with a new version of libav, and opencv sources will fail to build with this new library version.
It has C , C, Python and Java interfaces and supports Ubuntu Linux.
error: -------src-dir-------/opencv-2.4.10/modules/highgui/src/window.cpp:501: error: (-2) The function is not implemented.
Rebuild the library with Windows, GTK 2.x or Carbon support.
If you’re planning to use Qt 5.x, don’t use -D WITH_QT=ON.
Learn how to use Open CV 3 with Qt Creator 3.2 (Qt 5.3). If you do so, you’ll see that in addition to installing Open CV, the script will generate a log for you, to know how long did it take.