A License Plate Recognition and Speed Detection System - Index of

More documents

Recommendations

Info

opens a submenu that sets the camera’s frame rate, i.e. 30fps, 15fps, 7.5fps, etc. The “LPR” main menu item contains commands to set the intensity threshold and also commands to start and stop recording plate numbers to a file. There are two other application windows in addition to the main window. They are the “Processed Image” window and the “License Plate Detected” window. They are shown below. Processed Image Window License Plate Detected Window Fig. 38 Processed image Fig. 39 License number detected The “Processed Image” window shows live video from the webcam that has gone through image processing. Image processing functions create a black and white image where pixel values are either black (0) or white (1). The “License Plate Detected” shows the last license plate number detected and the speed the vehicle was traveling. The license plate number shown in this window is not an image but text. The three application windows show how the software converts live video to license plate number data. 54
Fig. 40 LPR.exe application windows showing image progression V.C.1 Instructions for Running the Application The application is run by double clicking the LPR.exe icon on the desktop. Before the application can successfully record license plate numbers of passing vehicles, the intensity threshold must first be set. The intensity threshold is a value used by the image processing algorithms and will be described in more detail later. To set the intensity threshold, the video camera should be placed in its final position along the roadside. The camera should be focused on a vehicle license plate. The vehicle should be in the center of its lane approximately 38.5’ from the camera lens. 1. Click Camera->check link. This will search the laptop for attached cameras. 2. Click Camera->select camera. This will select the desired camera. 3. Click Camera->init camera. This will initialize the camera. 4. Click Mode->640x480 Mono (8 bit). Camera images will be 640x480 pixels, each pixel will have an 8 bit value. 5. Click Camera->Show Camera. 6. Click Camera->Control Dialog (Optional). Set appropriate camera settings for a clear readable image picture or leave on auto settings. 7. Click Rate->30fps. Sets camera to send images at 30 frames per second. 8. Click LPR->Set Threshold plate number. Enter the license plate number of the vehicle in focus. 9. Click LPR->Set Intensity Threshold. This will set the intensity threshold. 10. A popup window will show the chosen intensity threshold. Make sure this number is not 0 and click OK. Once the threshold is set, the application can start recording license plates of passing vehicles. Click LPR->Start Recording to record license plate numbers to a file named licensePlates.txt. 55
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 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: Application Main Window Fig. 37 LPR
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
show all

A License Plate Recognition and Speed Detection System - Index of

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?