Patent ID: 8971570
Filing Date: 2015-03-03
Classification: A61B,G02B,G06F,G06K

Abstract:
1. A method, comprising: illuminating a viewing location during a first period of time with at least a first light source and a second light source, such that during the first period of time the first and second light sources both illuminate the viewing location and the first light source illuminates the viewing location with a higher intensity than the second light source; acquiring a first image from light reflected from the viewing location during the first period of time using a camera, wherein the first and second light sources are located off-axis with respect to an optical axis of the camera; illuminating the viewing location during a second period of time with at least the first light source and the second light source, such that during the second period of time the first and second light sources both illuminate the viewing location and the second light source illuminates the viewing location with a higher intensity than the first light source; acquiring a second image from light reflected from the viewing location during the second period of time using the camera; obtaining combined data from at least the first and the second images, wherein the combined data comprises a reference location, a first glint location, and a second glint location; and determining a gaze direction based on the combined data.