Current eye tracking systems are often limited by restrictive user constraints such as fixed head position, wearable sensors, infrared lighting, or expensive stereo camera setups. There are limitations to real-world deployment, including inconvenience, discomfort, and expense for users and organizations. Many existing systems also struggle with accuracy under head movement, lighting variation, or occlusion. A new solution is needed that enables accurate gaze tracking with minimal hardware, robustness to uncontrolled environments, and greater user friendliness.
This invention combines a fixed wide-angle camera with an active pan-tilt-zoom (PTZ) camera that dynamically zooms in on the eyes, then employs a novel calibration to recover each user’s 3D eyeball center, radius, and fovea position. A least-squares method computes the optical axis, then rotates the fovea to obtain the visual axis. The system operates entirely in visible light without infrared, stereo cameras, or room-specific setups and accommodates natural head pose changes through a two-stage iterative calibration procedure. The lab-scale prototype system has been validated using controlled user studies and webcam-based experimental gaze tracking trials.
• Enables gaze tracking from distances of ~3-11 feet using a dual-camera architecture
• Achieves compact gaze clusters with intra-cluster variation as low as ~1.09° mean angular deviation
• Eliminates the need for wearable eye-tracking devices or infrared-based systems
• Real-time 3D eyeball estimation and eye gaze tracking
• Enables accurate PoG estimation at distances beyond the ~50 cm range
• Accommodates natural head movement in uncontrolled environments
• United States Patent 8,885,882 – Filed 11/10/2014, Issued 11/11/2014
• United States Patent 9,311,527 – Filed 11/10/2014, Issued 4/12/2016
• United States Patent 9,953,214 – Filed 3/9/2016, Issued 4/24/2018
• Related publication available upon request
Lab-scale prototype system validated using controlled user studies and webcam-based experimental gaze tracking trials. TRL ~4–5.
This technology is available for licensing.
Strong licensing potential in human-computer interaction, adaptive interfaces, security analytics, AR/VR, and attention-monitoring markets where low-cost, head-free gaze tracking can enable scalable commercial deployment.
Prototype performance data, user study results, and additional technical details available upon request.