Casey Smith Doug Ritchie Fred Lloyd Michael Geary School of Electrical and Computer Engineering November 2, 2011 ECE 4007 Automated Speed Enforcement Using a Digital Imaging System

2 Project Overview A prototype speed enforcement system which processes images captured by multiple cameras 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

3 Design Objectives System –Software will determine car speed and isolate the license plate Accuracy –Detect car speed within 1 mile per hour Cost –Complete prototype for under $405.00

4 Design Illustration Camera Control and Image Acquisition Motion Detection Speed Detection License Plate Location Software Overview No Motion Detected Motion Detected Once Motion Detected Twice Above 5 mph

5 Image Acquisition Most critical component of ASED Acquires two images every 500ms –Left/Right camera Dynamic image filename structure for data storage and later processing

6 Image Acquisition: Demo

7 Motion Detection: Input Images Input Images before manipulation

8 Motion Detection: Image Comparison and Thresholding Subtracted Image Image After Thresholding

9 Motion Detection: Erosion and Dilation Erosion Dilation

10 Motion Detection: Noise Reduction Noise Reduced Image Masked Image

11 Speed Detection: RC Car Distance Computation Stereo Vision Triangulation Image courtesy of NI Developer Zone at

12 Speed Detection: Determining RC Car Speed Triangulation performed at times t and t + 500ms

13 License Plate Location: Reflection Removal Image With Reflection Image After Correction

14 License Plate Location Original License Plate Processed License Plate

15 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 More calculation required for speed detection via triangulation

16 Project Costs There are few costs associated with this design as LabVIEW and the required camera were provided free of charge by Georgia Tech. –Rolling cart: $90 –Remote controlled car: $60 –Total current cost: $150

17 Project Demonstration Place clear distance marks in the test area by which hand speed calculations can be done Run the car once in the test area above the set speed limit Run the car once in the test area below the set speed limit To be considered successful the ASED must correctly detect weather or not the car is speeding and locate the license plate of the speeding car.

18 Project Timeline (10/07) - Write image acquisition code (10/14) - Write motion detection code (11/18) - Write speed detection code (11/18) - Write license plate location code (11/25) - Modify code segments to work together (12/02) - Testing and debugging (12/16) - Final project presentation

19 Issues with Design Compatibility between LabVIEW 2009 and the Bumblebee XB3 camera Converting pixel distances to real-world distances for speed detection Finding a license plate within a given image Interfaces between code segments

20 Questions

21 Speed Detection: Trigonometric Functions Law Of SinesLaw Of Cosines

22 Speed Detection: Triangulation Details

23 Speed Detection: Triangulation Details Continued Known: D1, D2, b Unknown: H, g, c, I, k, d

24 Speed Detection: Alternatives Quickbird –Earth observation satellite –Object based vehicle extraction VASCAR –Combines stopwatch with computer –Two measurement spots on road

25 License Plate Location : ROI Location

26 Optical Character Recognition

27 Alternative Speed Detection Devices Pneumatic road tubesInfrared Sensors Radar Gun LiDAR