How License Plate Recognition (LPR) Technology Works to Deliver Accurate Security for Businesses

January 25, 2021

Hikvision HikWire blog article How License Plate Recognition (LPR) Technology Works to Deliver Accurate Security for Businesses

Hikvision’s LPR Systems Quickly Gather Vehicle Plate Data Using Several Key Steps


Being able to identify vehicles at parking entrances or intersections can provide major benefits for a range of businesses and organizations. Accurate license plate recognition (LPR) technology can support better site security, vehicle entrance management, and help staff search for vehicle data when an incident occurs. Hikvision LPR systems identify plate numbers using several key steps to provide effective vehicle access and parking lot management.

LPR technology now uses the most advanced algorithms to provide highly accurate and effective data gathering for vehicle license plate and color. Hikvision’s current LPR systems offer several benefits.

  • Efficient: Provides ultra-high accuracy rate for license plate recognition and non-stop vehicle flow monitoring
  • Automated Security: Auto-alarm triggering and notifications for unauthorized license plates
  • Flexible: Easy deployment and installation
  • Centralized Management: With HikCentral central management software (CMS), you can generate reports, find vehicle entrance/exit records, and get real-time alarm notifications.  

Hikvision LPR technology extracts license plate data from complex backgrounds, separates and recognizes each character on the plate, and reformats the plate information to gather accurate, real-time data. It uses the following steps to accomplish this task:

  • Plate locating technology that is able to identify both single section and dual section license plates, and does not rely on plate color or character structure to gather data.
  • Character partitioning, which determines the left and right borders of each character after plate locating finds the plate’s upper and lower borders.
  • Hikvision’s character recognition algorithm provides improvements over traditional plate recognition with its ability to recognize a wide variety of characters. 

Learn more about how these steps work to gather accurate data about vehicles and plate numbers in this Hikvision LPR technology paper. Visit our Vehicle Entrance Control webpage for additional information.

IMPORTANT! This model requires non-standard firmware. Do Not Install standard firmware (e.g. v.4.1.xx) on this model. Doing so will permanently damage your system. You must use custom firmware v.4.1.25 from the iDS-9632NXI-I8/16S product page.

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The I-series NVR (such as the DS-7716NI-I4) is one of Hikvision's most popular and feature-rich recorders. As such, many firmware revisions have been introduced over the years to continually ensure the product is compatible with the newest technology available. Due to the many revisions, we recommend that the user closely follows the instructions below in order to reduce the amount of time spent as well as the chance of failure.


Database Optimization and Repair

As more affordable IP cameras are introduced over time with greater video resolution and data sizes, more efficient database management also becomes necessary. The introduction of firmware v4.0 brought about a new database architecture in order to be futureproof.


After upgrading to v4.X, the recorder database will need to be converted and optimized. If you are experiencing issues where playback is expected but not found, make sure "Database Repair" is performed as indicated in the procedures and scenarios below.


Preparing the Upgrade

Before proceeding with upgrade, it is recommended that NVR configuration file is exported from the NVR over the network or on to a local USB drive.


Upgrading from v3.4.92 build 170518 or Older

  1. All recorders must reach v3.4.92 before proceeding further. Upgrading from versions before v3.4.92 directly to any version of v4.X will likely cause the recorder to fail.
  2. If the recorder is already at v3.4.92, a full factory default is highly recommended before upgrading to any version of v4.X. There is a high chance of unit failure (requiring RMA) if the unit is not defaulted before upgrade.
  3. After reaching v3.4.92 and performing a full factory default, an upgrade directly to v4.50.00 is acceptable.
  4. After the upgrade is completed and the recorder is reprogrammed, it may be beneficial to perform a Database Repair. For details, refer to the section "Database Optimization and Repair" above.
  5. To verify repair progress, you may refer to the HDD status, or search the recorder log for repair started and stopped entries. Note that while the HDD is repairing, new recordings are still being made, but some existing recordings may not be searchable until repair is complete.
  6. If you continue to observe playback issues after database repair, ensure there are no power, network, or motion detection issues. Should the problem persist, contact technical support.


Upgrading from Any v4.X Build to v4.50.00.

  1. Any v4.X build can be upgraded directly to v4.50.00.
  2. Export configuration is highly recommended before performing the upgrade.
  3. If upgrading from any v4.X version that was not v4.22.005, a Database Repair is recommended. Refer to Step 4 and onwards in the previous section.



Downgrading is not recommended. Due to new features and parameters constantly being added, downgrading may cause the NVR to factory default itself or require a manual default to operate properly.

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