SharpOS 11.8 Portal - Configuration page: Plate read - SharpOS 11.8

Sharp Administrator Guide 11.8

series
SharpOS 11.8
revised_modified
2020-04-22

In the Plate read section of the Sharp Portal Configuration page, you define the Reading mode of the SharpX cameras connected to the LPR Processing Unit. By default, the AutoVu system will capture plate reads continuously. This mode is the required reading mode for mobile AutoVu systems. Using Security Center event-to-actions or hot actions, you can also configure fixed AutoVu systems to capture plate reads when certain conditions are met, or when an external trigger is activated.

NOTE:
  • If you have upgraded the SharpOS software on the Sharp camera, any triggers that were configured prior to SharpOS 11.3 will continue to function, however the Source and State of the trigger will not be editable. For full functionality, you must delete the existing trigger and add a new trigger.
  • To control the outputs of the LPR Processing Unit using Security Center event-to-actions or hot actions, the SharpX video unit entity must be enrolled under the Archiver. It is no longer possible to control outputs if the LPR Processing Unit is enrolled under the LPR Manager.

Reading mode: Continuous

The Continuous reading mode is generally used for mobile AutoVu systems. It can also be used for fixed systems where no trigger is configured to signal the system to start reading plates.

Read strategy: The following options are available:
Fast moving vehicle
Applicable for installations where vehicles travel at moderate to high speeds. For example, use this read strategy for fixed Sharps overlooking a highway, or for mobile law enforcement installations where vehicles might be traveling at high speeds in opposite directions.
Slow moving vehicle
Applicable for use in typical mobile city law enforcement, mobile parking enforcement, and for monitoring parking lot entrances.
Gate control
Applicable for installations where vehicles must come to a stop when their plates are captured. For example, use this read strategy for fixed Sharps that are monitoring a gated parking lot or toll booth.
NOTE: The Gate control read strategy is applicable only for fixed Sharp installations.

Reading mode: Continuous with virtual loop

When a Sharp camera is set to the reading mode Continuous with virtual loop, the Sharp generates a plate read event whenever a vehicle is detected passing through the camera’s field of view. This allows the Sharp to act in a similar fashion to an induction loop installed under the road. Selecting the Continuous with virtual loop reading mode for a Sharp increases vehicle count accuracy when recording occupancy in parking lots, particularly in areas or in seasons that might have a higher rate of no-read events (for example, in muddy or snowy weather conditions). If the camera fails to capture a vehicle’s license plate, the plate number appears as NOPLATE in Security Center, and no LPR image is provided. For more information, see Investigating NOPLATE reads.
NOTE: This read mode is applicable only for fixed Sharp installations.
Read strategy: The following options are available:
Fast moving vehicle
Applicable for installations where vehicles travel at moderate to high speeds. For example, use this read strategy for fixed Sharps overlooking a highway, or for mobile law enforcement installations where vehicles might be traveling at high speeds in opposite directions.
Slow moving vehicle
Applicable for use in typical mobile city law enforcement, mobile parking enforcement, and for monitoring parking lot entrances.
Gate control
Applicable for installations where vehicles must come to a stop when their plates are captured. For example, use this read strategy for fixed Sharps that are monitoring a gated parking lot or toll booth.
NOTE: The Gate control read strategy is applicable only for fixed Sharp installations.

Reading mode: Conditional

The Conditional reading mode captures continuous plate reads from all SharpX cameras while an input signal is detected on the LPR Processing Unit.

Tip: Instead of using the Conditional reading mode, consider using the Multi-conditional reading mode, which offers more flexibility when creating conditions.
Read strategy: The following options are available:
Fast moving vehicle
Applicable for installations where vehicles travel at moderate to high speeds. For example, use this read strategy for fixed Sharps overlooking a highway, or for mobile law enforcement installations where vehicles might be traveling at high speeds in opposite directions.
Slow moving vehicle
Applicable for use in typical mobile city law enforcement, mobile parking enforcement, and for monitoring parking lot entrances.
Gate control
Applicable for installations where vehicles must come to a stop when their plates are captured. For example, use this read strategy for fixed Sharps that are monitoring a gated parking lot or toll booth.
NOTE: The Gate control read strategy is applicable only for fixed Sharp installations.
Generates reads only when input (A, B, C, or D) is (Off or On): Enables conditional plate reading that depends on the auxiliary inputs on the LPR Processing Unit. When you select this option, you must choose an input and state from the drop-down lists.
  • Input: Select the LPR Processing Unit auxiliary input.
  • Input states:
    • High: Starts reading when detecting voltage on the selected input that is higher than 4.5 V.
    • Low: Stops reading when detecting voltage on the selected input that is lower than 2.5 V.
NOTE:
  • There is an uncertain area between 2.5V and 4.5V where the LPR Processing Unit may interpret the signal as High or Low . This is due to normal electronics tolerances. Always ensure that your signal levels do not dwell (stabilize) in the uncertain area; as well, the level transitions (High-Low, Low-High) should be clean and fast.
  • The inputs can detect voltages between 0 V and 32 V.
  • Input impedance = 3.3 K Ω.

Reading mode: Multi-conditional

Using the Multi-conditional reading mode, you can control individual cameras using the LPR Processing Unit's input pins. This means that you can configure the system to generate reads from a specific SharpX camera after a signal is received from an electrical trigger.

NOTE: Patrol vehicles that are equipped with the AutoVu™ car camera switch must use the Mutli-conditional reading mode.
Read strategy: The following options are available:
Fast moving vehicle
Applicable for installations where vehicles travel at moderate to high speeds. For example, use this read strategy for fixed Sharps overlooking a highway, or for mobile law enforcement installations where vehicles might be traveling at high speeds in opposite directions.
Slow moving vehicle
Applicable for use in typical mobile city law enforcement, mobile parking enforcement, and for monitoring parking lot entrances.
Gate control
Applicable for installations where vehicles must come to a stop when their plates are captured. For example, use this read strategy for fixed Sharps that are monitoring a gated parking lot or toll booth.
NOTE: The Gate control read strategy is applicable only for fixed Sharp installations.
Generate reads from LPR camera when input A is High/Low: Enables conditional plate reading that depends on the auxiliary inputs on the LPR Processing Unit. Click Add new condition to add as many conditions as you require, then choose an input and state from the drop-down lists.
  • Input: Select the LPR Processing Unit auxiliary input.
  • Input states:
    • High: Starts reading when detecting voltage on the selected input that is higher than 4.5 V.
    • Low: Stops reading when detecting voltage on the selected input that is lower than 2.5 V.
NOTE:
  • There is an uncertain area between 2.5V and 4.5V where the LPR Processing Unit may interpret the signal as High or Low . This is due to normal electronics tolerances. Always ensure that your signal levels do not dwell (stabilize) in the uncertain area; as well, the level transitions (High-Low, Low-High) should be clean and fast.
  • The inputs can detect voltages between 0 V and 32 V.
  • Input impedance = 3.3 K Ω.

Reading mode: Single read on trigger

Using the Single read on trigger read mode, you can configure the system to capture a plate read after a signal is received from an electrical trigger, or after a Security Center event-to-action or hot action. This configuration is designed for use with fixed AutoVu installations and is ideal for controlling vehicle access to gated parking lots. If the trigger device is not located in view of the camera, you can configure the plate read capture to occur before or after the trigger is activated.

NOTE: If the camera fails to capture the plate, no LPR image is associated with the read and the plate number NOPLATE is associated to the read. For more information, see Investigating NOPLATE reads.
Add trigger...: The following options are available when adding a trigger:
  • For: Select which SharpX camera is activated by the trigger.
  • When: Select which LPR Processing Unit auxiliary input receives the trigger signal and indicate the state of the input. You can also select an External input (Security Center event-to-action).
  • Capture window:
    • Start X ms before/after trigger: The capture can occur up to 30000 ms before or after the trigger is activated.
    • Duration X ms: The system will try to capture a plate read for up to 30000 ms.
  • If no plate:
    • Capture image X ms after trigger: If no plate is read during the capture window, an "no plate" read is logged and the system captures a context image of the vehicle so that the read can be manually edited.
    • Use LPR image as context image: The system will use an image from the LPR camera for the "no plate" read.