Average Speed Monitoring via Camera Network and Time Verification
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Solution Overview
Problem
Existing vehicle speed monitoring systems face challenges in detecting speeding vehicles between camera locations, as drivers often slow down near cameras but may exceed speed limits in between, and previous solutions like toll-based systems are costly and inconvenient.
Innovation Solution
A network of cameras captures images of vehicle registration marks, with electronic processing and transmission of data files to a central system for comparison, calculating travel times between camera locations and generating evidential records for speeding violations, using synchronized clocks and independent time sources for accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If speed cameras are placed at specific locations to detect speeding vehicles, then vehicles can be detected at camera locations, but vehicles may exceed speed limits between cameras with no detection possible
Solution Approach 1:
The system segments the monitoring task by placing multiple cameras at different geographical locations along the road network. Each camera captures images at its specific location, and the central processing system segments the analysis by matching vehicle registration marks across different camera locations to calculate travel times between segments, thereby achieving continuous monitoring coverage.
Solution Approach 2:
The system introduces an intermediary element - the vehicle registration mark - that serves as a unique identifier allowing the system to track and match the same vehicle across different camera locations. This intermediary enables the calculation of travel times between locations without requiring direct continuous observation of the vehicle's speed.
2Measurement precision
If toll-based systems are used to measure travel time between tolls for average speed calculation, then average speed can be measured, but construction costs and inconvenience to motorists increase
Solution Approach 1:
Instead of using physical toll gates that require construction and infrastructure installation, the system uses optical copies - images of vehicle registration marks captured by cameras - to identify and track vehicles. This copying approach eliminates the need for expensive physical toll infrastructure while achieving the same function of measuring travel time between points.
Solution Approach 2:
The system replaces the mechanical toll gate infrastructure with an optical and electronic system. Cameras capture images optically, character recognition processes the images electronically to extract registration marks, and central processing systems calculate travel times digitally, substituting the entire mechanical toll collection infrastructure with a non-contact optical-electronic system.
3Productivity
If multiple cameras are deployed across different locations for comprehensive monitoring, then detection coverage improves, but system complexity and data processing requirements increase
Solution Approach 1:
The system extracts only the essential information - vehicle registration marks - from the full camera images using character recognition processes. Instead of transmitting and processing entire high-resolution images from multiple cameras, the system extracts and transmits only the extracted registration marks and associated metadata, significantly reducing data processing requirements and system complexity.
Data Source
AI summary
A vehicle speed monitoring system comprises a plurality of cameras (10, 40) for capturing images of vehicle registration marks of passing vehicles. An electronic processing means produces electronic records for each vehicle recognition mark with an associated time of image capture. When a match is found between a vehicle registration mark stemming from a first camera (10) and from a second camera (40) then a central electronic processing means (20) uses the image capture times to calculate a travel time of the vehicle. This time is compared with a minimum travel time for a journey between the first and second cameras. Each camera (10, 40) is provided with clock means individual thereto which produces the times of image capture and each camera is also provided with timing verification means which accesses a plurality of independent time sources. The independent time sources originate time signals independently of the central electronic processing means, and the verification means is capable of checking whether the clock means is generating a time within a predetermined tolerance of the time signals obtained from the independent sources.