A License Plate Recognition and Speed Detection System - Index of

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Federal Highway Administration and the National Highway Traffic Safety Administration have indicated their support for automated enforcement systems. Numerous states (Arizona, California, Colorado, Delaware, Hawaii, Illinois, Maryland, New York and Virginia) have enacted statutes allowing the use of these automated systems to enforce traffic laws (Ref21). Connecticut statute (C.G.S. Title 14, Chapter 248, § 14-219c, Vehicle Highway Use), does not specifically mention photo radar or red light cameras, but the statute’s phrase “any other speed monitoring device approved by the Commissioner of Public Safety” could allow for their use. In the 2005 legislative session, House Bill 5744 (Ref. 31) attempted to introduce devices that are “designed to automatically record the image of the license plate of a motor vehicle that is entering an intersection in violation of a traffic control signal”. However, the bill was never signed into law. In the January 2007 session, raised bill #1443 was introduced in the State Senate where it has been referred to the Joint Committee on Judiciary; it has not left the Committee. In November 2007, Connecticut Governor Jodi Rell proposed installing automated traffic enforcement devices along a stretch of Interstate-95 in East Lyme where I-95, I-395, and Route 1 intersect. This proposal is being reviewed by the Department of Public Safety. The National Highway Safety Commission has set 65/55 mph as the speed limit on much of the Federal Interstate Highway system, with lower limits set for densely populated areas. It is the responsibility of the individual states to establish appropriate speed limits for roadways that are not part of the Interstate system. For example, Connecticut General Statute Title 14, Chapter 249, Part 1, Section 14-309, assigns the responsibility for determining safe speed limits to State Highway Traffic Commission. In most states motor vehicle violations are considered warrant-less misdemeanor violations and in general they fall under common law practice (Ref. 28). According to common 76
law, a warrant-less crime must be committed in presence of a police officer and the arrest for the crime must be immediate. This has lead to a number of legal challenges to moving violation arrests based on the use of photo radars or red light cameras. The challenges have two components. First, since the photo radar/red light cameras are machines and not human beings, the requirement “in presence of a police officer” was not met. Second, the infraction was recorded by a device that required the retrieval of film or the processing of digital data introducing a time delay, the arrest was not immediate. An on-line review (Lexus-Nexus and Loislaw databases) has shown the courts to be unsympathetic to these arguments provided that the citation is issued “in a reasonable amount of time”. Various state laws have defined the meaning of “in a reasonable amount of time”. For example, the State of Rhode Island defines it to be within 14 days of the occurrence of the infraction. Other states require the citation to be mailed within 48 hours of the infraction. The U.S. Supreme Court to date has not commented on nor felt obligated to redefine common law practices; thus legal challenges based on a strict interpretation of common law will continue to fail. Further legal challenges to the use of photo radar and/or red light cameras have contended that these devices violate a person’s rights under the 4 th , 6 th , and 14 th Amendments to the U.S. Constitution. The Fourth Amendment states in part "the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated." For a photo radar/red light camera to be considered constitutional under the 4 th Amendment it must provide the government with “probable cause” to assume that a crime has been committed. Probable cause is defined under the 4 th Amendment as “a reasonable belief” that a crime has been committed. Reasonable belief is based on the circumstances. Thus, the reasonable belief that establishes the probable cause requirement is present when the police 77
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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
Page 15 and 16:
“Horizontal angle must not exceed
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The video camera has another compon
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width is only 5/16” will be 3 pix
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signal, such as NTSC, a capture car
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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 and 74: 100 MHz wide or 200 MHz wide. Since
Page 75: As with any new technology affectin
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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A License Plate Recognition and Speed Detection System - Index of

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