Review of Pupil

Pupil is an accessible, affordable and extensible open source platform for ubiquitous eye-tracking and gaze-based interaction. Pupil's advantages are:

1. Light-weight eye tracking headset
2. an open source software framework for mobile eye tracking
3. A graphical user interface to playback and visualize video and gaze data.
4. High-resolution scene and eye cameras for monocular and binocular gaze estimation.
5. Software and GUI are platform-independent and include state-of-the-art algorithms for real-time pupil detection and tracking, calibration, and accurate gaze estimation.

After doing a performance evaluation it was shown that Pupil can provide an average gaze estimation accuracy of 0.6 degree of visual angle (0.08 degree precision) with a processing pipeline latency of only 0.045 seconds.

In order to know what someone is looking at, we must to establish a mapping between pupil and gaze positions. This is what we call calibration. The following pictures will show us the process in using Pupil hardware and software for gaze-tracking.

Pic.1 Positioning of the headset and adjusting the direction of the gaze

Pic.2 A correct way of looking at the camera (1) and three following incorrect was of doing that (2,3,4)

Pic.3 Points for calibrating our gaze

Pic.4 The process of recording the gaze

Pic.5 Recording live gaze example