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Casey Smith Doug Ritchie Fred Lloyd Michael Geary

Automated Speed Enforcement Using a Digital Imaging System. Casey Smith Doug Ritchie Fred Lloyd Michael Geary. December 15, 2011 ECE 4007. School of Electrical and Computer Engineering. Project Overview.

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Casey Smith Doug Ritchie Fred Lloyd Michael Geary

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  1. Automated Speed Enforcement Using a Digital Imaging System Casey Smith Doug Ritchie Fred Lloyd Michael Geary December 15, 2011 ECE 4007 School of Electrical and Computer Engineering

  2. Project Overview • A prototype speed enforcement system which processes images captured by a pair of webcams to determine remote controlled car speed and locate license plates • Improve roadway safety while producing revenue for governments which choose to deploy them • Potential customers of the finished product include local, state, and federal law enforcement officials • Development Cost: $227.61

  3. Project Illustration

  4. Camera Only Design Approach Advantages • Easy to interface with a computer for processing • No need to interface several physical detection devices • Disadvantages • More coding compared to other methods • Must capture multiple images of vehicles

  5. Design Objectives

  6. ASED Specifications

  7. Software Algorithm

  8. Image Acquisition • Key component of ASED • Acquires two images every 300ms • SD camera captures images of vehicles travelling perpendicular to its field of view • LPL camera captures a rear image of the vehicle passing through its field of view • Dynamic image filename structure for data storage and later processing

  9. Motion Detection: Input Images Input Images before manipulation

  10. Motion Detection: Image Comparison and Thresholding Image After Thresholding Subtracted Image

  11. Speed Detection: RC Car Distance Computation • The RC Car will travel perpendicular to the SD Camera at 8 feet away • We can then use the camera’s field of view to calculate distance d

  12. Speed Detection: Finding Regions of Interest • Using a particle filter specifies the region of interest to be the front of the RC car

  13. Speed Detection: Determining RC Car Speed • Picture size is 640x480 pixels so we can use a ratio to find real world distances in the pictures • Given that we know the ROI lines are at x1 and x2 respectively we can perform the following to calculate our speed in miles per hour

  14. License Plate Location: Input Images Input Images

  15. License Plate Location: Isolation Subtracted Image Mask Image

  16. License Plate Location: Extraction License Plate Image Extracted License Plate

  17. Project Demonstration • Setup cameras in proper locations to create test area • Run the car once in the test area above the set speed limit (5mph) • Run the car once in the test area below the set speed limit (5mph) • To be considered successful the ASED must correctly detect whether or not the car is speeding and locate the license plate of the speeding car.

  18. Problems and Solutions

  19. Final Budget

  20. Recommended Future Work • Design should allow for full functionality in non-ideal environments • Using motor vehicles with standard license plates instead of remote controlled cars with paper license plates • Incorporating cameras with more advanced image processing functionality built-in

  21. Questions

  22. Alternative Speed Detection Devices Pneumatic road tubes Infrared Sensors Radar Gun LiDAR

  23. Speed Error Values

  24. Speed Error Values

  25. Speed Error Values

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