Researchers claim that this method is accurate to ±5 bpm.
Webcams may be installed at places such as childcare centres, offices, shops and private areas to monitor security and general activity.
Some of them, for example, those used as online traffic cameras, are expensive, rugged professional video cameras.
They have also become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware.
The most popular use of webcams is the establishment of video links, permitting computers to act as videophones or videoconference stations.
This can be applied to games, providing additional control, improved interactivity and immersiveness.
Free Track is a free webcam motion-tracking application for Microsoft Windows that can track a special head-mounted model in up to six degrees of freedom and output data to mouse, keyboard, joystick and Free Track-supported games.