These parameters are typically estimated during the process called calibration. However, to be usable in gaze position estimation, this information must be associated with an area in an observer scene, which requires evaluating several parameters. There are already well established methods for eye detection on a camera capture. Video based oculography (VOG) is the most popular technique because it is non-intrusive, can be use in users’ natural environment and are relatively cheap as it uses only classic cameras. Recently eye tracking has become a popular technique that may be used for variety of applications starting from medical ones, through psychological, analyzinguser experience, ending with interactive games.
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