A License Plate Recognition and Speed Detection System - Index of

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lane is 9 feet wide, the HFOV should be at least 5 feet wide in order to capture the license plate of a passing vehicle even when the vehicle is traveling within its lane. Another telephoto lens specification is the aperture. The telephoto lens aperture defines the size of the hole that allows light to pass through. The larger the value, the more light enters the camera providing faster exposure times. However, too large a value will provide a smaller depth of field and the image will be in focus for only a small range. “The depth of field (DOF) of a lens is its ability to maintain a desired amount of image quality as the object is positioned closer to and further from best focus (Ref 41).” A telephoto lens that meets LPR requirements will have a depth of field capable of imaging cars at varying distances and also allow enough light to enter for fast exposure times. Vehicle 2 Ft 2 Ft Plate 1 Ft 5 Ft HFOV Video Camera Fig. 10 Camera horizontal field of view 16
The video camera has another component called the charge-coupled device (CCD) chip. Light passes through the telephoto lens and lands on the video camera’s CCD. The CCD converts electromagnetic energy received from the light into electrical energy. The CCD chip sensors must be extremely sensitive to near infrared light. This is to offset the minimum amount of light energy that will fall on the CCD as previously discussed. Sensitivity is usually defined in a camera specification called the minimum illumination. It is measured in LUX. The lower the LUX value the more sensitive the camera is to light. A very low LUX value is desirable for license plate recognition. Consumer cameras are built to be sensitive to mostly visible light. An LPR camera needs to be sensitive to near infrared light. The graphs below show the difference in sensitivity between a standard consumer CCD chip and one specialized for infrared imaging. 17
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: “Horizontal angle must not exceed
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 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 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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