Noldus observer can be used to analyze the user’s facial expression in real-time. The system is based on video analysis that can be performed either in real-time (by recording the user with a web-camera or a built-in laptop camera) or offline using previously recorder videos.
In addition to determining the user’s facial expressions the system can also calculate the user’s gaze direction, head orientation and other personal characteristics.
More information can be found on the manufacturer’s website.