Gaze calibration

A computer-implemented method comprising:

• receiving, from a gaze tracker, a stream of gaze measurements of a user operating a computing device having a display;
• carrying out an explicit calibration phase of which the user is aware by:
• obtaining measurements from the stream during a hand-eye coordination task of the user, the task involving user input at a plurality of calibration markers on the display;
• and
• carrying out an implicit calibration phase of which the user is unaware by obtaining measurements from the stream during operation, by the user, of a graphical user interface at the display.

A computer-implemented gaze calibration module comprising:

• an input interface arranged to receive, from a gaze tracker, a stream of gaze measurements of a user operating a computing device having a display;
• a processor arranged to carry out an explicit calibration phase of which the user is aware by:
• displaying a plurality of calibration markers at the display;
• detecting, at the computing device, a plurality of manual user input events associated with the calibration markers;
• identifying a plurality of the gaze measurements associated with at least some of the detected manual user input events;
• and where the processor is arranged to calibrate the stream of gaze measurements using the identified plurality of gaze measurements and locations of the associated manual user input events.