AR Glasses Projection Positioning via Marker Triangulation
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Solution Overview
Problem
Existing augmented reality (AR) image display systems for drivers face challenges in accurately setting the projection position and size of AR images due to variations in the driver's posture and position, leading to potential overlaps with vehicle interior components.
Innovation Solution
An image display system comprising AR glasses, a control unit, and markers, where the control unit calculates the projection position and size of AR images using a triangulation method based on the angles of incidence and separation distance between markers placed on the vehicle's interior surfaces, ensuring accurate and comfortable AR image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the projection position is determined based on a fixed reference point in the vehicle cabin, then the system structure is simple, but the projection accuracy deteriorates due to driver posture variations
Solution Approach 1:
The patent introduces markers as intermediary objects placed on the vehicle interior surfaces. These markers serve as mediators between the driver and the projection system, providing reference points that account for driver position and posture variations. The control unit calculates the projection position based on the relative positions between the driver and these marker intermediaries, thereby improving projection accuracy without significantly complicating the overall system structure.
2Measurement precision
If markers are placed on the vehicle interior surfaces, then the projection position accuracy is improved, but the device complexity increases due to additional components
Solution Approach 1:
The patent employs markers that are already present in the vehicle interior as part of the normal design, such as decorative elements or functional components. These markers serve dual purposes: their original vehicle functions and as reference points for AR projection. This self-service approach allows the system to utilize existing vehicle components for measurement purposes, improving accuracy without adding significant complexity.
3Reliability
If the AR image projection does not account for driver position variations, then the system operation is simple, but the projection reliability deteriorates due to overlapping with interior components
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the relative positions between the driver and the markers, and adjusts the projection position accordingly. The imager captures the positions of markers relative to the driver, and this information feeds back to the control unit which calculates and adjusts the optimal projection position. This closed-loop feedback system ensures reliable projection that adapts to driver position variations while maintaining reasonable operational simplicity.
Data Source
AI summary
In AR glasses, an incident angle calculation unit calculates first and second angles of incidence of first and second markers, respectively, to an imager relative to a reference line in the real world in accordance with image plane coordinates of the first and second markers in the image captured by the imager. A separation distance calculation unit calculates a camera-to-marker distance, which is a distance from the imager to the first marker, in accordance with the calculated first and second angles of incidence, and an inter-marker separation distance between the first and second markers along the reference line in the real world. A display adjustment unit adjusts a projection position and size of the AR image with respect to the first marker in the image plane coordinates in accordance with the camera-to-marker distance.