Building Computer Vision Projects with OpenCV 4 and C++

Graphic user interface with Qt

The Qt user interface gives us more control and options to work with our images.

The interface is divided into the following three main areas:

• Toolbar
• Image area
• Status bar

We can see these three areas in the following picture. At the top of the image is the toolbar, the image is the main area, and the status bar can be seen at the bottom of the image:

The toolbar has the following buttons from left to right:

• Four buttons for panning
• Zoom x1
• Zoom x30, show labels
• Zoom in
• Zoom out
• Save current image
• Show properties

These options can be seen clearly in the following image:

The image area shows an image and ...