Autostereoscopic Gaze Projection for Low-Latency 3D Alignment
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Solution Overview
Problem
Existing 3D display systems in vehicles suffer from system latency, misalignment of displays with gaze direction, and inaccuracies in eye gaze prediction, which compromise safety and user experience.
Innovation Solution
An autostereoscopic display system that uses a controller to process multiple frames of video data to extract coordinates, calculate velocity of body movement, and compensate for latency by adjusting the optical arrangement to align with the projected gaze position, using time factors to enhance accuracy and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the entire 3D display is actuated by motors to adjust orientation, then the display can be oriented relative to vehicle occupant, but the angle of rotation is limited and may not always be in line of sight of user
Solution Approach 1:
The system segments the display into two independent components: a fixed display screen and a movable optical arrangement (parallax barrier). This allows the optical arrangement to be adjusted independently to track user gaze without requiring the entire display to rotate, thereby achieving line-of-sight alignment while avoiding the limitations of motorized full-display actuation.
2Measurement precision
If high-resolution cameras are used to capture high frame rate for eye tracking, then eye tracking accuracy is improved, but system cost increases substantially
Solution Approach 1:
The system uses dynamic prediction algorithms that process video data at standard frame rates (e.g., 30 fps) and predict future eye gaze positions based on velocity and acceleration calculations. This dynamic approach compensates for lower frame rate limitations, achieving accurate eye tracking without requiring expensive high-resolution cameras operating at high frame rates.
3Device complexity
If standard cameras are used for eye tracking, then system cost is reduced, but the cameras cannot support high sampling rate to characterise actual movement of eye due to rapid movement of viewer
Solution Approach 1:
The system performs preliminary calculations of velocity and acceleration from consecutive video frames, then uses these predictions to proactively adjust the optical arrangement before the eye actually moves to the predicted position. This preliminary action compensates for the low sampling rate of standard cameras, allowing accurate tracking of rapid eye movements without requiring high frame rates.
4Manufacturing precision
If the display is positioned perpendicular to line of sight, then 3D effect is optimized, but the parallax barrier may not always be at correct angle due to driver position shift
Solution Approach 1:
The system implements a feedback loop using video capture devices to continuously monitor eye position, calculate predicted gaze positions based on movement velocity and acceleration, and adjust the optical arrangement accordingly. This closed-loop feedback ensures the display maintains optimal 3D effect alignment regardless of driver position shifts or viewing angle changes.
Data Source
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AI summary
This disclosure describes an autostereoscopic system comprising: an optical arrangement; and a controller operable to calculate and actuate the optical arrangement relative to a projected gaze position, wherein the projected gaze position is determined based upon a velocity of body movement calculated between at least one coordinate extracted between two frames of video data received by the controller, and at least one category of time factor in relation to a performance of the system. A method for actuating an optical arrangement of an autostereoscopic display screen system as disclosed herein is also provided.