A License Plate Recognition and Speed Detection System - Index of
A License Plate Recognition and Speed Detection System - Index of
A License Plate Recognition and Speed Detection System - Index of
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Telephoto Lens Aperture Small enough to provide required<br />
depth <strong>of</strong> field, but large enough for fast<br />
exposure time<br />
CCD Sensitivity / Minimum High sensitivity. Low LUX value for<br />
Illumination<br />
infrared lighting<br />
Signal Output Digital or computer protocol for clean<br />
high resolution image<br />
Frame Rate (optional) If camera is also being used as a<br />
trigger it must have a high frame rate<br />
Trigger Port (optional) Most cameras have a trigger port that<br />
is used to signal the camera when to<br />
take a picture<br />
CCD Resolution High enough to provide acceptable<br />
level <strong>of</strong> license plate detail when<br />
capturing an entire lane width<br />
III.C. LPR Computer<br />
A computer specialized for license plate recognition is similar to a st<strong>and</strong>ard PC running a<br />
Windows or Linux operating system. An example <strong>of</strong> a good c<strong>and</strong>idate computer would consist<br />
<strong>of</strong> an MSI Industrial GM965 Mini-ITX motherboard running an Intel Core 2 Duo Mobile<br />
processor (see appendix B). There are several characteristics an LPR customized computer<br />
should have. A powerful microprocessor <strong>and</strong> much memory are needed to perform the<br />
dem<strong>and</strong>ing calculations needed by the image processing <strong>and</strong> object character recognition<br />
algorithms. Having multiple processors is a plus due to the parallel nature <strong>of</strong> these algorithms.<br />
For example, one processor can run low level image processing functions while another<br />
processor performs object character recognition functions. For roadside LPR systems, it is<br />
desirable to have computers that are compact, weather pro<strong>of</strong>, <strong>and</strong> consume minimum electricity.<br />
They may need to have wireless communication if wired technology is unavailable. The LPR<br />
computer may also need to have an image acquisition capture card in order to connect to a<br />
camera. The type <strong>of</strong> card is dependent on the camera interface. If camera output is an analog<br />
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