From: john1@ED.AC.UK Subject: PROD: Low-Cost Eye Tracking System Date: Fri, 19 Jan 1996 15:17:28 +0000 Message-ID: cavazza@thomson-lcr.fr (Marc Cavazza) asked: >I'm looking for a low-cost eye tracking system to be > used in VR-based systems for disabled patients... > > I remember seeing some videos on such a low-cost system > based on EMG detection rather than pupillar reflectance >Can anyone help me finding a reseller for the system or provide > me with alternative sources ? > EOG based systems have a fundamental problem with baseline drift. They can be quite an effective technology for detecting eye-MOVEMENTS, but there are substantial problems to be overcome before you can use them as eye-POSITION transducers. Commmercial suppliers may calim that they can be used for this, but if you want to know where someone is looking in a scene (which I'd guess you do) I would suggest that you examine the performance of any EOG sysem very carefully before you buy. I do have a contact with a British based company developing a low-cost centre-of-pupil tracker based around some rather elegant holographic optics that may suit your needs and those of others in this research area. The product is not on the shelves, but close to Beta-release. I'm not sure how much info. I can release at this time so I'll check with the company and re-post what the status is. ********************************************************* Dr John P. Wann or < J.P.Wann@rdg.ac.uk> ********************************************************** Edinburgh Virtual Environment Lab. - Now sited at: (Wann, Mon-Williams) (Rushton, Hawkes) Department of Psychology AND Department of Psychology University of Reading University of Edinburgh PO Box 238 7 George Square Reading RG6 6AL Edinburgh EH8 9JZ +44 1734 318532 +44 131 650 3426 Fx +44 1734 316604 +44 131 650 3461 ***********************************************************