A License Plate Recognition and Speed Detection System - Index of

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.
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