OpenCV Essentials by Oscar Deniz Suarez et al.

By Oscar Deniz Suarez et al.

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Choose a compiler. 4. Set the BUILD_EXAMPLES and WITH_QT options, and finally click on the Configure button. 5. Then, click on Configure again. 6. Close CMake after the Generate step. 8. Open a console under the OPENCV_BUILD directory and run the mingw32-make command to start the compilation. 9. If the build process doesn’t produce an error, run mingw32-make install on the command line. 10. Add the OpenCV bin directory (for DLLs) to the Path environment variable (for example, OPENCV_BUILD\install\x64\mingw\bin\).

Create an output window (namedWindow) and show (imshow) an image on it. 5. Wait for a key (waitKey). org/). The second argument is a flag or flag combination, which controls some window properties (for example, enable resize). Then, the window created with Qt and the namedWindow function uses the default flags: CV_WINDOW_AUTOSIZE, CV_WINDOW_KEEPRATIO, or CV_GUI_EXPANDED. get(CV_CAP_PROP_FPS); Since the method returns a double value, an explicit cast to int is done.

Pro files as input, qmake generates the makefiles for Make (that is, mingw32-make) that drive the build process for each profile (that is, release and debug). In Windows, path backslashes should be duplicated, as shown in the preceding example. hpp header since it will in turn include all the header files of OpenCV. The following example illustrates several essential tasks in an OpenCV application: 1. Read an image from the file (imread) to a Mat class and check whether the target variable is not empty (Mat::empty).

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