A License Plate Recognition and Speed Detection System - Index of

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camera would be capable of performing both functions. It would be possible to both, capture high quality images of license plates for character recognition, and also, be used as a trigger to signal when an image should be passed to the character recognition routines. Calculations for the distances shown in figure 26 are given in appendix C. Our LPR system used a standard laptop (Compaq nc6220) to run the image processing and object character recognition software. The processing power of the laptop was fast enough to detect the presence of a vehicle in an image within the 30 frames per second time limit. It was also fast enough to perform the character recognition before a second vehicle would pass. We also purchased a FireWire PCMCIA card for the laptop to be able to connect the video camera to the laptop since it did not have a FireWire port. Using a laptop is impractical for an LPR system. Most systems need to be weatherproofed. . 38
V.B.2. Radar Gun The Ramsey Kit Ramsey Electronics of Victor, New York (Ref. 3) has been selling hobby electronic kits since the early 1970’s. The advantages of using the Ramsey kit over hacking the Mattel toy is that the kit has a full schematic diagram and all parts are labeled. Thus it is easier to locate the point in the Ramsey circuit where we could tap into the circuit for an RS232 fed line. We purchased and assembled a kit similar to the one shown below. The Microwave Oscillator Circuitry Fig. 29 Ramsey Radar Gun Kit The kit contains two printed circuit boards that require assembly, the microwave oscillator board and the speed readout board. . We will discuss each in turn. Figure 30 is the circuit diagram for the microwave oscillator. Figure 31 shows the completed circuit board. 39
Page 1 and 2: A License Plate Recognition and Spe
Page 3 and 4: I. Abstract Since the 1980’s law
Page 5 and 6: II. Introduction The purpose of thi
Page 7 and 8: III. License Plate Recognition Conc
Page 9 and 10: III.A. LPR Light Source There are s
Page 11 and 12: eflective paint effect greatly incr
Page 13 and 14: Uniform and Constant To be as unifo
Page 15 and 16: “Horizontal angle must not exceed
Page 17 and 18: The video camera has another compon
Page 19 and 20: width is only 5/16” will be 3 pix
Page 21 and 22: 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: Our video camera served two functio
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 and 76: As with any new technology affectin
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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