Eye-tracking using a GPU

A gaze tracking system, comprising:

• a visual display controllable by a display signal;
• an imaging device adapted to image the face of a viewer of the visual display;
• and
• a graphics card adapted to generate a display signal for causing said visual display to produce a screen pattern,
• said system characterized in a gaze-point determining module adapted to use the graphics card as a parallel processor to determine a gaze point of the viewer's eye based on in part the geometry of a corneo-scleral reflection of the screen pattern using an image of the viewer's eye containing said corneo-scleral reflection of the screen pattern, said image being received from the imaging device,
• wherein the gaze-point determining module is operable to cause the graphics card to receive, directly from the imaging device, an image of the viewer's eye containing a cornea-scleral reflection of the screen pattern, and
• wherein the graphics card is further adapted to:
• extract image features in said corneo-scleral reflection of the screen pattern;
• and
• compare said image features with the display signal in order to retrieve these in the screen pattern.