AR Device Calibration Using Distance-Based Camera-Antenna Offsets
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Solution Overview
Problem
Linking virtual reality (VR) and augmented reality (AR) devices to high-accuracy Global Navigation Satellite System (GNSS) data has proven difficult.
Innovation Solution
A calibration method for AR devices using a camera, an antenna, and an electronic distance measurement (EDM) device, involving capturing distances and images to compute 3D surface points and offsets, allowing precise alignment of AR models with real-world coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If VR and AR devices are linked to GNSS data, then position and velocity information can be obtained, but high-accuracy alignment between device coordinates and GNSS coordinates is difficult to achieve
Solution Approach 1:
The patent replaces complex manual calibration procedures with an automated optical measurement system. The EDM device uses laser-based electronic distance measurement to automatically determine spatial relationships between the camera and antenna, substituting mechanical alignment procedures with optical field-based measurement.
Solution Approach 2:
The patent introduces a calibration target as an intermediary object between the camera and EDM device. This target provides known reference points that facilitate the measurement and calculation of the camera-to-antenna offset, serving as a mediator that enables precise coordinate transformation.
2Measurement precision
If manual calibration methods are used to determine camera-to-antenna offsets, then device positioning can be achieved, but accuracy and precision are insufficient
Solution Approach 1:
The patent replaces manual measurement tools with an electronic distance measurement device that uses laser-based optical fields to automatically determine distances. This substitution enables rapid, high-precision measurement of the camera-to-target and antenna-to-target distances without manual intervention.
Solution Approach 2:
The patent creates a mathematical model (copy) of the physical calibration setup through coordinate geometry calculations. By computing the camera-to-antenna offset based on measured distances and known target coordinates, the system creates an accurate virtual representation of the spatial relationship without requiring physical measurement 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
Enables accurate superimposition of AR models onto real-world environments by determining camera-to-antenna offsets, enhancing the precision and alignment of AR devices with GNSS data.
Implementation Method 1
capturing, at a first time, a first distance to a first point using the EDM device
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
Techniques are described for calibrating an AR device having a camera, an antenna, an EDM device, and a display. First and second distances to first and second points are captured using the EDM device. First and second camera images containing the first and second points are captured using the camera. First and second 2D screen coordinates for the first and second points on the display are determined using the first and second camera images. First and second 3D surface points for the first and second points are computed based on the first and second 2D screen coordinates and the first and second distances. A position of the EDM device is computed using a 3D vector formed between the first and second 3D surface points. A camera-to-antenna offset is computed based on the position of the EDM device and a known antenna-to-EDM offset.