Dual Purkinje-Image Eyetracker
Abstract
This project presents a new tool to track the eye's angle of rotation. The method employed is that of tracking two reflections, the first and fourth Purkinje-images. Four Purkinje-images are formed within the eye as light is reflected off of cornea and eye lens surfaces. Coincidentally, the first and fourth reflections occur on the same image plane allowing them to be simultaneously captured by a focused charge-coupled device (CCD) camera. Measurements of the relative displacement between these two images reveal the orientation of the eye in space independent of head position in space. An infrared point light source was used to create the Purkinje-images within the eye and a CCD camera was used to capture the images. Computer hardware and software were used to record the eye images and to analyze the image data. Image processing techniques were successfully employed to locate two Purkinje-images within each image of the eye. Through the use of image processing techniques, it is shown that it is feasible to develop a more efficient and lightweight system that is accurate, non-invasive to the subject, and allows the subject to be mobile. Eye tracking systems find application in aids to disabled patients, medical procedures, and military systems. Adapting this work to real-time Eye tracking is a future consideration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1996
- Accession Number
- ADA375792
Entities
People
- Ann C. Chamberlain
Organizations
- United States Naval Academy