The ALPR matcher is the AutoVu™ software engine that matches license plates captured by Sharp cameras to license plates in a data source such as a hotlist or permit list, or to previously captured license plates, such as for overtime enforcement. The ALPR matcher determines if a plate read results in a hit.
How ALPR matcher logic works
Real-world conditions make license plate recognition difficult. License plates might have characters that are hidden by dirt or snow, while other characters’ paint may be faded or chipped. Some license plates have pictures or screws that can be misread as legitimate license plate characters.
If the ALPR matcher were only capable of raising a hit based on an exact match, many plates that should be hits would instead be missed.
The ALPR matcher must be capable of more than “yes/no” logic because the plate read ABC12 might be a match. It would be better to raise the hotlist hit, and let the Genetec Patroller™ operator decide whether or not the hit is legitimate. To do this, the ALPR matcher uses different levels of “maybe” logic to allow for more possibilities for a plate match.