Systems and methods for performing eye gaze tracking

A system configured to determine eye gaze vectors of a subject, the system comprising:

• one or more imaging devices configured to capture a sequence of time separated images of the subject's face including one or both of the subject's eyes;
• and
• a processor circuit configured to:
• process the images to detect specular reflections present in the images;
• determine, from the detected specular reflections, a presence or absence of corneal reflections and non-corneal reflections;
• upon determination of at least one corneal reflection, determine a two dimensional position of at least one corneal reflection and a two dimensional position of at least one reference eye feature of the subject, and perform a first eye gaze tracking procedure based on relative positions of the at least one corneal reflection and the at least one reference eye feature;
• upon determination of an absence of corneal reflections, determine one or more three dimensional positions of respective one or more reference facial features of the subject, and perform a second eye gaze tracking procedure on one or both eyes of the subject based on an estimation of a head pose of the subject based on the three dimensional positions of the one or more reference facial features;
• and
• determine, based on the first or second eye gaze tracking procedure, eye gaze vectors.