How does the movement on an interactive whiteboard get captured?

The movement on an interactive whiteboard is captured through interference with infrared light. Interactive whiteboards typically use a series of infrared emitters and sensors to detect the user's input. When a user interacts with the board—whether by touching it with a finger or a stylus—the infrared light is disrupted. The sensors then detect these disruptions, which allows the system to track the movement and translate it into actions on the screen.

This method provides precise and responsive interaction, as the system constantly monitors for changes in the infrared signals to determine where and how the user is engaging with the board. Other input methods, while potentially effective, do not operate on the same principle of infrared light interference, which is fundamental to the functionality of many interactive whiteboards.