OpenCV 3.x with Python By Example - Second Edition

What's happening underneath?

Let's start with the main function in this program. We create a white image on which we are going to click using the mouse. We then create a named window and bind the MouseCallback function to this window. The MouseCallback function is basically the function that will be called when a mouse event is detected. There are many kinds of mouse events, such as clicking, double-clicking, dragging, and so on. In our case, we just want to detect a mouse click. In the detect_quadrant function, we check the first input argument event to see what action was performed. OpenCV provides a set of predefined events, and we can call them using specific keywords. If you want to see a list of all the mouse events, you can go to the ...