Vehicle Localization via 3D Model Reprojection Across Zones
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Solution Overview
Problem
Current systems for locating a vehicle in multiple zones are costly and complex, requiring the duplication of localization systems to achieve accurate vehicle tracking and speed measurement across different areas, such as road sections and line crossings.
Innovation Solution
A system that uses a pair of calibrated cameras to create a 3D model of a vehicle in one zone and estimates its position in subsequent zones through non-linear optimization of reprojection error, allowing for accurate tracking and speed measurement between zones using a monocular camera.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a localization system consisting of a camera and additional sensor (such as a loop on the ground) is used to ensure accurate vehicle positioning, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a 3D model (virtual copy) of the vehicle created from images taken at a first location to represent the vehicle's characteristics. This virtual model is then tracked across multiple zones without requiring additional physical sensors at each location, replacing complex hardware duplication with computational modeling
Solution Approach 2:
The patent replaces physical mechanical sensors (such as ground loops) with image processing and computational methods. The localization system uses computer vision algorithms to track the vehicle's 3D model across zones, substituting mechanical measurement systems with optical and computational approaches
2Measurement precision
If localization systems are doubled to track the same vehicle in a first zone and then in a second zone, then measurement precision is improved, but facility cost increases
Solution Approach 1:
The patent creates a universal 3D vehicle model that can be tracked across multiple zones using the same imaging infrastructure. The single set of cameras serves multiple functions: creating the initial 3D model and subsequently tracking the vehicle across all zones, eliminating the need for separate localization systems in each zone
Solution Approach 2:
The patent merges the vehicle modeling function and the multi-zone tracking function into a single integrated system. The 3D model created at the first location is reused and tracked across all subsequent zones, combining what would traditionally require separate systems into one unified approach
3Measurement precision
If a pair of cameras is used to create a 3D model of a vehicle, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent transitions from 2D images to a 3D virtual model of the vehicle. By constructing a three-dimensional representation from two-dimensional camera images, the system gains depth information and spatial accuracy without proportionally increasing hardware complexity, as the 3D model is computationally generated rather than physically constructed
Data Source
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AI summary
The present invention relates to a system for locating a single vehicle (50) in at least two zones (110, 120, 121, 122) through which it passes consecutively, characterized in that it comprises: - a pair of cameras (11 and 12) and, - at least one monocular camera (20, 21, 22), - a modeling unit (31), - a position estimation unit (32) designed to determine the coordinates of at least one point of said vehicle (50) at a second location within said zone (120, 12n) based on: - image signals from a monocular camera at a second location (20n), - the model at the first location M1 of said vehicle (50) established by said modeling unit (31), and - information I1, and thus to locate said vehicle (50) at said second location. The present invention also relates to a localization method.The present invention further relates to a method and system for measuring the speed of a vehicle between two areas far apart from each other, a method and system for detecting crossing of at least one line, a method and system for measuring instantaneous speed, as well as a computer program.