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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.
By removing the IR filter of the webcam, IR LEDs can be used, which has the advantage of being invisible to the naked eye, removing a distraction from the user.
Track IR is a commercial version of this technology.
For example, the position of a single light source can be tracked and used to emulate a mouse pointer, a head-mounted light would enable hands-free computing and would greatly improve computer accessibility.
making them the lowest-cost form of videotelephony.