Camera-GPS Offset Correction for Accurate PTC Asset Location
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Solution Overview
Problem
The misrepresentation of PTC critical asset locations due to field errors and environmental changes in railroad environments affects the performance of Positive Train Control systems, necessitating improved localization methods.
Innovation Solution
A system utilizing a camera and GPS unit on a vehicle to determine pixel distances and offset distances for accurate geographical positioning of PTC critical assets, eliminating the need for manual measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual measurements are used to locate PTC critical assets, then measurement precision can be maintained, but productivity and safety are reduced due to manual intervention requirements
Solution Approach 1:
The patent replaces manual mechanical measurement systems with an automated image processing system. Cameras capture images of PTC critical assets, and computer vision algorithms automatically determine object locations by analyzing pixel coordinates and calculating distances based on image geometry and GPS data, eliminating the need for manual surveying while maintaining accuracy.
Solution Approach 2:
The patent creates a digital copy of the physical measurement process through image data. Instead of physically measuring distances with tape measures or surveying equipment, the system uses captured images and processes pixel information to mathematically calculate distances and locations, reproducing measurement results without physical intervention.
2Productivity
If GPS units are used for location data, then productivity is improved, but measurement precision deteriorates due to offset distances between camera and GPS unit
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously calculates and adjusts offset distances based on the relative positions of the camera and GPS unit. By determining the offset distance from the camera location to the GPS unit location and applying this correction to all measurements, the system compensates for the fixed spatial relationship between components, maintaining precision despite the separation.
Solution Approach 2:
The patent changes the parameter used for location determination from raw GPS coordinates to corrected coordinates that account for offset distance. The system transforms location data by adjusting GPS positions based on the calculated offset between camera and GPS unit, converting inaccurate raw measurements into precise corrected measurements.
3Adaptability or versatility
If field errors and environmental changes are present, then adaptability is improved, but measurement precision deteriorates affecting PTC system performance
Solution Approach 1:
The patent replaces traditional mechanical surveying methods that are susceptible to field errors with a digital image processing system. By using cameras to capture visual data and computer vision algorithms to analyze pixel coordinates, the system eliminates human measurement errors and adapts to environmental changes without affecting measurement precision.
Data Source
AI summary
In one embodiment, a method includes receiving an image generated by a camera associated with a vehicle. The image includes a point of interest (POI) associated with a physical object. The method also includes determining a number of pixels from the POI of the image to an edge of the image. The edge of the image represents a location of the camera. The method further includes determining an offset distance from the POI to a Global Positioning System (GPS) unit associated with the vehicle using the number of pixels.