About Sharp read strategies - SharpV | SharpOS 13.2

AutoVu™ SharpV Administrator Guide 13.2

Applies to
SharpV | SharpOS 13.2
Last updated
2020-09-16
Content type
Guides
Guides > Administrator guides
Language
English (United States)
Product
SharpOS
SharpV
Version
13.2

When you define a read strategy analytic for a Sharp camera, it optimizes how the camera captures license plate reads based on the expected vehicle speed and behavior.

Read strategies for fixed and mobile Sharp cameras

There are several scenarios where ALPR might be required. If vehicles generally pass the Sharp at the same speed, you can enable a read strategy to optimize ALPR performance for that scenario. For example, a mobile unit on a law enforcement vehicle must read license plates at a higher speed and frequency than a fixed unit used to control a gate. The read strategy analytic takes advantage of these differences to minimize duplicated and missed license plate reads. Each read strategy automatically configures the optimal internal values for the scenario.

Slow moving vehicle
Select this strategy for fixed Sharp cameras monitoring parking lots and for mobile Sharp cameras used for parking enforcement. Generally results in better ALPR accuracy, but occasionally misses or duplicates plate reads.
Fast moving vehicle
Select this strategy for fixed Sharp cameras monitoring highways and for mobile Sharp cameras used for law enforcement. This strategy obtains ALPR reads quickly, but often duplicates reads if the plate is in the field of view for a long time.
Gate control
Select this when vehicles must come to a stop when the license plates are read. For example, select this option for a SharpV camera that is monitoring a gated parking lot entrance or toll booth.
Free-Flow
Select this when AutoVu™ Free-Flow is enabled on the ALPR Manager. This strategy improves the accuracy of the parking lot occupancy calculation.
NOTE: When using the Free-Flow read strategy, the system waits for the vehicle to exit the field of view before selecting the best plate read. You might notice a delay of a few seconds when monitoring live plate reads. For this reason, we do not recommend using this strategy when the camera relays are also used to control a physical gates.
ALPR scenario Slow moving vehicle Fast moving vehicle Gate control Free-Flow
Mobile
Parking enforcement

     
Law enforcement  

   
Fixed        
Highways  

   
Parking lots

     
Parking lots (AutoVu™ Free-Flow)      

Gate control    

 

Read strategy characteristics

Characteristic Slow moving vehicle Fast moving vehicle Gate control Free-Flow
Missed plate reads More frequent Less frequent Less frequent More frequent
Duplicated plate reads More frequent More frequent if plates are in the field of view for a long time. Less frequent Less frequent
Latency Medium-low Low Medium High
ALPR accuracy Better Good Best Best