Radio Transceiver Scale Factor Determination in 3D Reconstruction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 3D reconstruction methods from 2D images face challenges in determining the scale factor, which is essential for making metric measurements, adding external objects, and combining different reconstructions, due to the ambiguity in camera parameters and positions, often requiring manual intervention or external references.
Innovation Solution
An active device, such as a radio transceiver, is integrated with the camera to transmit and measure radio signal reflection profiles, comparing them to simulated profiles generated from a 3D model to estimate the unknown scale factor, utilizing existing camera transceivers like cellular or Bluetooth radios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the perspective camera model is used for 3D reconstruction from 2D images, then the reconstruction can be determined only up to an unknown projective transformation, but the scale factor remains unknown and cannot be determined
Solution Approach 1:
A radio transceiver is introduced as an intermediary device between the camera and the 3D reconstruction system. The transceiver transmits radio signals and measures reflection profiles from the scene, providing additional constraints that resolve the scale ambiguity in the reconstruction without requiring direct modification of the camera parameters or positions.
Solution Approach 2:
The patent replaces traditional mechanical or optical measurement methods (such as using reference objects of known dimensions or tracking camera motion) with a radio-based measurement system. The radio transceiver uses electromagnetic wave reflection profiles to determine scale information, substituting physical measurement approaches with a different physical domain.
2Measurement precision
If reference objects or multiple cameras with known distances are used to determine scale, then the scale factor can be determined, but the device complexity and setup requirements increase
Solution Approach 1:
The radio transceiver serves multiple functions: it acts as both a communication device and a measurement instrument for determining scale in the 3D reconstruction. By integrating the radio signal transmission and reflection profile measurement capabilities into a single device, the system eliminates the need for separate reference objects or additional calibration equipment.
Solution Approach 2:
The radio transceiver enables the system to self-determine its scale factor by measuring reflection profiles from the scene itself. The system uses the radio signals to directly probe the spatial structure and obtain scale information without requiring external reference objects or complex calibration procedures.
3Adaptability or versatility
If manual scaling is performed to combine 3D reconstructions, then the reconstructions can be combined, but the process is time-consuming and inaccurate
Solution Approach 1:
The radio transceiver provides feedback information through measured reflection profiles that directly indicate the scale of the 3D reconstruction. This feedback enables automatic scale determination and alignment of multiple reconstructions without requiring manual intervention, as the system can use the reflection profile data to computationally determine the correct scaling and positioning.
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 allows for automatic and accurate determination of the scale factor, enabling precise measurements and combination of 3D reconstructions without manual scaling, improving the reliability and accuracy of 3D reconstruction processes.
Implementation Method 1
measuring a reflection profile for a radio signal transmitted by the radio transceiver from a first one of the camera positions
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A radio transceiver included in or attached to an imaging camera is used to facilitate the automatic determination of a scale factor in a three-dimensional (3D) reconstruction. The radio transceiver transmits a radio signal from each of one or more camera positions and measures a reflection profile for the transmitted signal. The measured reflection profile is compared to a simulated reflection profile, generated from a 3D model of the subject/scene of interest, to determine an estimate of an unknown scale for the 3D model. In various embodiments, the radio transceiver may be adapted from a radio device that already exists in or on the imaging camera (e.g., a cellular radio, Bluetooth® radio, or the like) or may be added to an imaging camera.