Qt 5 and OpenCV 4 Computer Vision Projects

Capturing and playing with Qt

In the preceding section, we showed you how to capture a video from a webcam using OpenCV. The Qt library also provides many facilities for playing with multimedia in its Qt Multimedia module, including ones that allow us to capture a video from a webcam. In this section, we will have a go at using these facilities to capture a video from the webcam instead of using OpenCV.

To capture a video using Qt, we can simply use an instance of the QCamera class with a QCameraViewfinder object instead of the QGraphicsSence and QGraphicsView objects. Let's see their declarations in the mainwindow.h header file:

     #ifdef GAZER_USE_QT_CAMERA         QCamera *camera;         QCameraViewfinder *viewfinder;     #endif

As you can see, the variable ...