AR Device Alignment via Mobile Surveying Rod
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Solution Overview
Problem
Surveying systems, particularly augmented-reality devices, face challenges in accurately aligning their coordinate systems with the environment due to positional drift, especially when used in dynamic or obstructed environments, where traditional calibration methods are cumbersome and prone to errors.
Innovation Solution
The integration of a surveying rod with a reflector and a visual design, such as a QR code, allows for precise alignment of the augmented-reality device's coordinate system with the environment by using a combination of laser-based and image-based measurements, leveraging the reflector for positional accuracy and the visual design for image-based orientation, thereby correcting for drift and improving measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used for aligning augmented-reality devices, then the alignment process can be completed, but the process is cumbersome and prone to errors
Solution Approach 1:
A mobile reference object is introduced as an intermediary between the correction source and the augmented-reality device. This mobile reference carries both a reflector (for laser-based position measurement) and a visual design (for image-based orientation measurement), enabling the AR device to align its coordinate system with the environment through a simplified two-step process rather than complex traditional calibration
2Adaptability or versatility
If augmented-reality devices are used in dynamic or obstructed environments, then the devices can operate in more scenarios, but positional drift occurs reducing measurement accuracy
Solution Approach 1:
The system implements real-time feedback by continuously measuring the position of the mobile reference using both laser-based (correction source) and image-based (AR device camera) methods. The AR device uses this feedback to calculate its position and orientation relative to the environment and dynamically corrects for drift, maintaining measurement accuracy even in dynamic or obstructed environments
Solution Approach 2:
The mobile reference object serves multiple functions simultaneously: it acts as a position marker for the correction source, an orientation target for the AR device camera, and a reference frame for coordinate system alignment. This multi-functionality enables the system to maintain accuracy across diverse environmental conditions without requiring multiple separate calibration tools
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise and accurate alignment of augmented-reality devices with the environment, reducing measurement errors and improving usability by allowing for real-time correction of positional drift, even in complex or obstructed settings, with accuracy within millimeter or centimeter precision.
Implementation Method 1
a correction source (e.g., comprising a laser), wherein the correction source is precisely positioned relative to the environment
Implementation Method 2
measure a position of the surveying rod in relation to the correction source (e.g., based on light from the laser of the correction source reflecting from the reflector coupled with the surveying rod)
Data Source
AI summary
An augmented-reality device is aligned with an environment using a correction source. A position of a reflector (or other device that is part of a surveying system) coupled with a surveying rod is measured in relation to a correction. A position of a visual design, which is coupled with the surveying rod, is measured in relation to an augmented-reality device, based on an image of the visual design acquired by the augmented-reality device. A coordinate system of the augmented-reality device is aligned with the environment based on the position of the reflector in relation to the correction source, the position of the visual design in relation to the augmented-reality device, and an offset between the reflector and visual design.