Curb Ramp Inspection Tool Using Photogrammetric 3D Modeling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current manual methods for inspecting curb ramps for compliance with ADA requirements are time-consuming, labor-intensive, and difficult to replicate, lacking accuracy and convenience.
Innovation Solution
A curb ramp inspection tool that uses 3D data point acquisition through photogrammetric techniques, combined with a gravity reference and markers, to calculate distance and slope measurements, generating a detailed report for compliance verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual measurement techniques (measuring tapes, levels) are used to inspect curb ramps, then the inspection process is simple to implement, but the inspection is time-consuming and labor-intensive
Solution Approach 1:
The patent replaces manual mechanical measurement tools (measuring tapes, levels) with an automated photogrammetric system using cameras and image processing algorithms. The system captures multiple images of the curb ramp from different angles and uses structure-from-motion techniques to automatically generate 3D models and calculate slope measurements, eliminating the need for manual mechanical measurements and significantly reducing inspection time.
Solution Approach 2:
The inspection system performs self-measurement by automatically capturing images, processing them through photogrammetric algorithms, and generating slope calculations without requiring manual intervention. The system autonomously identifies key points on the curb ramp, computes 3D coordinates, and determines compliance metrics, making the inspection process self-service and highly efficient.
2Measurement precision
If manual measurement techniques are used, then the equipment required is simple, but the measurement accuracy and repeatability are difficult to ensure
Solution Approach 1:
The patent replaces simple mechanical measurement tools with a sophisticated photogrammetric system that uses multiple cameras, GPS receivers, and complex image processing algorithms. This substitution increases device complexity but dramatically improves measurement precision by using automated coordinate geometry and 3D modeling to calculate slope with high accuracy and repeatability.
Solution Approach 2:
The system transitions from 2D image capture to 3D spatial measurement by using photogrammetric techniques. Multiple images taken from different angles are processed to create three-dimensional models of the curb ramp, enabling precise measurement of slope and dimensions that cannot be accurately obtained with traditional 2D manual measurement methods.
3Reliability
If automated photogrammetric techniques are used to acquire 3D data points, then measurement accuracy and repeatability are improved, but the device complexity and processing requirements increase
Solution Approach 1:
The inspection system integrates multiple functions into a single platform: image capture, GPS location tracking, 3D modeling, slope calculation, and compliance assessment. This multi-functional approach increases device complexity but ensures consistent, repeatable results by using the same automated processes for every inspection, eliminating variability introduced by different inspectors using different manual methods.
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
The tool provides accurate, repeatable, and efficient inspections, reducing labor requirements and ensuring compliance with ADA standards by generating precise 3D models and measurements.
Implementation Method 1
The acquired images are then used to obtain 3D data points using photogrammetric range imaging techniques, such as a structure from motion (SFM) technique.
Implementation Method 2
The ARP may utilize a dual axis inclinometer to determine a reference (e.g., gravity) plane.
Data Source
AI summary
Techniques for measuring a monument, including obtaining a set of two or more images of a monument environment, detecting a set of markers in the set of images, wherein the set of markers are positioned on a plane level with respect to gravity by a leveling device, and wherein the leveling device is configured to automatically level the markers, generating a virtual representation of the monument environment with respect to gravity, mapping the monument to a virtual representation, determining one or more slopes and dimensions of the monument based on the mapped monument and the gravity plane, and outputting the one or more slopes and dimensions of the monument.