Headset BIM Alignment via 2D Marker Coordinate Transformation
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Solution Overview
Problem
Existing augmented reality solutions for displaying Building Information Models (BIM) at construction sites are cumbersome, requiring lengthy calibration processes and often result in inaccuracies due to noisy measurements and the need for specific marker placements, limiting flexibility and accuracy in dynamic construction environments.
Innovation Solution
A method using a camera-equipped headset that captures images of two-dimensional markers to align the headset's coordinate system with the BIM's coordinate system, allowing for quick initialization and dynamic high-accuracy tracking without the need for additional calibration tools, and enabling flexible use with various positioning systems, including deep neural network architectures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional stake out/set out devices and control points are used to establish locations, then the BIM model can be displayed at the construction site, but the calibration process becomes lengthy and complex
Solution Approach 1:
The patent extracts the calibration function from complex conventional devices and concentrates it into a simple two-dimensional marker. The marker contains encoded coordinate information that can be directly read by the camera-equipped headset, eliminating the need for lengthy calibration procedures while maintaining alignment accuracy.
Solution Approach 2:
The patent uses a two-dimensional marker that encodes three-dimensional coordinate information as a simplified copy of the spatial reference data. This 2D representation contains all necessary coordinate system transformation data, allowing the headset to quickly initialize and align with the BIM coordinate system without physical measurement devices.
2Measurement precision
If additional calibration tools are used to align coordinate systems, then alignment accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the coordinate system alignment function into the two-dimensional marker itself. The marker encodes multiple pieces of information including coordinate transformations, allowing a single simple component to perform what previously required multiple complex calibration tools and procedures.
Solution Approach 2:
The two-dimensional marker serves multiple functions: it provides coordinate system reference, enables camera calibration, and facilitates headset initialization all in one component. This universal marker replaces multiple specialized calibration tools, reducing device complexity while maintaining alignment precision.
3Measurement precision
If specific marker placements are required for calibration, then alignment accuracy is maintained, but ease of operation decreases
Solution Approach 1:
The patent changes the parameters encoded in the two-dimensional marker to include complete coordinate transformation information. This allows the marker to provide accurate alignment data regardless of its placement location, giving operators flexibility in where to position the marker without compromising alignment accuracy.
Data Source
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AI summary
Certain examples described herein present a method of configuring a headset for display of a building information model (BUM) at a construction site. In one example, the method includes: determining a pose of the headset using a positioning system; obtaining an image of a two-dimensional marker positioned within the construction site; determining a BIM-to-camera transformation between an origin of a coordinate system used by the building information model and an origin of the coordinate system of the camera based on a location of the two-dimensional marker within the image; determining a camera-to-positioning transformation between the origin of the coordinate system used by the camera and an origin of a coordinate system used by the positioning system; and determining a BIM-to-positioning transformation.