A License Plate Recognition and Speed Detection System - Index of

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Early in their development stages these devices used wet-film cameras to record alleged violators’ actions. This required a police officer to manually retrieve the film, have it developed, and then it required visual inspection to obtain a license plate number. When Charge Coupled Device (CCD) cameras became available in digital cameras, they replaced the film camera. The pictures could now be recorded on flash drives, saving the time and expense of developing film. However, an officer still had to retrieve the flash drive. With the proliferation of wireless communications devices, it should only be a matter of time before a company like Hi-Tech Solutions replaces the wired connections in the diagram below with wireless connections via Bluetooth or ZigBee technology. For a listing of major radar gun manufacturers, please see Appendix A. Fig. 55 Possible Traffic Enforcement Network 74
As with any new technology affecting people’s lives, automated traffic enforcement systems have been the object of various legal challenges, which we’ll briefly discuss in the next section. Legality of LPR/traffic violation systems Disclaimer: In this section we discuss the legality of license plate recognition systems. Since we are not lawyers, the material presented here is not to be construed to be legal advice, nor is it intended to be an exhaustive treatment of the subject matter. Research has shown that some of the major causes of motor vehicle accidents are speeding and failure to obey traffic signs and signals, i.e. stop signs and red lights. In 2002, over thirteen thousand people were killed in speed related motor vehicle accidents, which resulted in a cost to the American taxpayer of $10 billion. Statistics for 2003 have shown more than 176,000 people were injured by motorists that ran stop lights. This has lead to an additional $14 billion dollar tax burden. This is above and beyond all the pain and suffering resulting from these accidents. The Insurance Institute of Highway Safety conducted a 9-month study using photo radars in Scottsdale, Arizona. The study was confined to an 8-mile stretch of the 25-mile long highway known as “the Loop”. Prior measurements showed fifteen percent of the motorists were driving at speeds < 10 mph above the posted limit. By the end of the study period the percentage had dropped to less than 2%. Similarly, in Montgomery County, MD, the number of speeding motorists dropped by 70%. However, once the program in Scottsdale ended, the average speeds went up to 69 mph in a 65-mph zone and more than 12% of the drivers were traveling at 75 mph or more. As a result of such studies and in order to prevent the violation of traffic laws, the 75
Page 1 and 2:
A License Plate Recognition and Spe
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I. Abstract Since the 1980’s law
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II. Introduction The purpose of thi
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III. License Plate Recognition Conc
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III.A. LPR Light Source There are s
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eflective paint effect greatly incr
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Uniform and Constant To be as unifo
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“Horizontal angle must not exceed
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The video camera has another compon
Page 19 and 20:
width is only 5/16” will be 3 pix
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signal, such as NTSC, a capture car
Page 23 and 24: choose a trigger that will require
Page 25 and 26: We briefly considered laser rangefi
Page 27 and 28: Fig. 17 Doppler Effect (Ref. 14) Th
Page 29 and 30: In this project, we will be using t
Page 31 and 32: V. Our System Design and Implementa
Page 33 and 34: LPR/SD System Process Flow Retrieve
Page 35 and 36: Fig. 25 Image of our LPR/SD system
Page 37 and 38: Our video camera served two functio
Page 39 and 40: V.B.2. Radar Gun The Ramsey Kit Ram
Page 41 and 42: Fig. 31 Assembled Oscillator The mi
Page 43 and 44: up to 100MHz. Once the signal has b
Page 45 and 46: I will discuss the pathway the inpu
Page 47 and 48: Fig. 35 Comparator Operation The si
Page 49 and 50: V.B.3. Serial Interface Circuit Boa
Page 51 and 52: we set pins 8 to 15 as input pins a
Page 53 and 54: Application Main Window Fig. 37 LPR
Page 55 and 56: Fig. 40 LPR.exe application windows
Page 57 and 58: Serial library was written by Ramon
Page 59 and 60: W1, B2, B3, B4, W5, B6, B7, B8, B9,
Page 61 and 62: characters were first extracted. Th
Page 63 and 64: Plate Number - 791GPB Test Results
Page 65 and 66: VI. Additional Applications The lic
Page 67 and 68: needed to communicate with the traf
Page 69 and 70: Local Network Fig. 50 LPR applicati
Page 71 and 72: VII. State of the Art Commercial Sy
Page 73: 100 MHz wide or 200 MHz wide. Since
Page 77 and 78: law, a warrant-less crime must be c
Page 79 and 80: experience high traffic volumes or
Page 81 and 82: quite a fun experience to build the
Page 83 and 84: 15) Radar Setup: http://mpdc.dc.gov
Page 85 and 86: Appendix A: Our LPR/SD System Compo
Page 87 and 88: Appendix B: Commercial Components 8
Page 89 and 90: MDL LaserAce® IM OEM Laser Modules
Page 91 and 92: UF500 Infrared Illuminator 91
Page 93 and 94: HI-TECH Solutions SeeCar Software R
Page 96: Appendix C: Camera Setup Calculatio
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