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ANPR Cameras Revealed: What Are They Watching, and What Are They Good For?

Author:

Márton Sipos

12 minutes read

ANPR cameras are advanced monitoring tools that use optical character recognition (OCR) to read license plates, offering valuable insights that enhance security and efficiency. These cutting-edge devices form a solid foundation for smart cities, road toll collection, automated parking access control, logistics, and numerous other applications where vehicle identification and tracking are essential.

In this article, you’ll not only learn what ANPR cameras are and how they work but also explore the numerous benefits they bring to smart city infrastructure. From automating access control systems and improving security to preventing car theft and optimizing traffic management, ANPR cameras play a crucial role in creating safer, smarter urban environments. 


What Is an ANPR Camera?

Most people don’t know, and we are here to provide an easy-to-understand explanation. ANPR stands for Automatic Number Plate Recognition (ALPR for Automatic License Plate Recognition, or just LPR). It’s a robust security device that relies on quality images and robust ALPR software that can perform various functions, which we will mention later in this blog post.

Adaptive Recognition is a leader in the ANPR software industry. Our purpose-made Vidar license plate recognition camera is a giant leap in traffic flow security because it can pull driver details from the number plate and index them in the backend data. The main purpose of these cameras is number plate recognition, a specialized functionality you can’t get with a conventional camera. They need to take clear images at any time of the day and any speed up to 300 km/h.

This is what an LPR camera looks like on a highway gantry

How do ANPR cameras work? 

The ANPR process consists of several well-coordinated steps, each designed to ensure maximum accuracy and reliability in identifying and processing license plates. Here’s a detailed step-by-step breakdown of how Adaptive Recognition’s smart ANPR cameras work: 

Step 1: Advanced Image Capture with Built-In Multi-Trigger Vehicle Detection 

The process begins when ANPR cameras, strategically positioned along roads, entrances, or checkpoints, capture high-quality images of vehicles as they pass by. These cameras are specially designed to focus on both the vehicle and its license plate, ensuring clear and precise visual data is collected for the next stages of analysis.

Step 2: License Plate Localization 

At this stage, the system’s software algorithms analyze the preprocessed image to detect the location of the license plate. The algorithms identify the exact position, size, and orientation of the plate within the image, which is essential for precise reading by eliminating distractions and cropping only the license plate from the image as an add-on feature. 

Step 3: Optical Character Recognition (OCR) 

Once the license plate has been located, the system employs Optical Character Recognition (OCR) technology. This process involves analyzing each character individually while also considering the full syntax of the license plate to ensure accurate interpretation. The system effectively excludes irrelevant elements and focuses solely on the license plate, enabling precise recognition and conversion into digital data. This step is critical for ensuring that the license plate is accurately read, even under varying conditions, such as different fonts or plate designs. 

+ 1 Extra Step: Vehicle Identification beyond ANPR 

Finally, smart ANPR cameras, such as Adaptive Recognition’s Vidar, go beyond simple license plate recognition. They also identify the vehicle’s make, model, and color, adding valuable context for enhanced vehicle profiling. This advanced capability supports more efficient and automated systems for tasks like access control, security monitoring, and traffic management.

The data collected by ANPR cameras is utilized by systems and business intelligence solutions built by system integrators. These systems can cross-check the data against police databases and other sources to enable informed decisions and trigger specific actions based on the results.  

By following this detailed, step-by-step process, ANPR systems provide a robust solution for a wide range of applications, from enhancing traffic safety to streamlining access control in secure facilities. The technology’s ability to read and process license plates with high accuracy and speed makes it an invaluable tool for modern traffic and security management.


Benefits of ANPR/LPR Cameras

ANPR cameras are the most advanced cameras in the market. They can perform various functions, like reading number plates and identifying the make and model of cars regardless of how fast or slow their speed is. Moreover, a number plate recognition camera can also identify the vehicle’s color. Besides, it sends the ANPR and make-n-model data to a central server, verifying the toll payment verification. Sometimes, manufacturers calibrate these cameras only to count cars to predict traffic jams and control the traffic flow.

1. 24/7 Monitoring

Unlike most car park barrier systems, an automatic number plate recognition camera is your best bet to track entering and exiting vehicles at the car park. Moreover, these cameras are active 24/7, and they record every detail of the scene. Therefore, you won’t be leaving your car park insecure even for a second. If there is an incident in your car park at late hours, a license plate recognition camera can record the scene, and you can pull driver information via their number plate.

2. Efficient Security at an Affordable Rate

Manned guards are excellent to control any criminal situation in your car park, but human error can sometimes become troublesome. Guards are efficient in the daytime, but they need breaks and cannot concentrate at the same level during an 8 to 12-hour shift. Moreover, it’s comparatively expensive to hire a person to secure your car park when you can do it at a lower cost with a license plate camera. Your guard can benefit from a digital ally so they can supervise multiple sites. This significantly improves the efficiency of available resources.

3.   Complete Automation and Full Visibility

License plate recognition cameras allow complete automation at the entry and exit points of your vicinity and control the incoming traffic flow. Company employees registered in the company database are allowed swift access through electronic barriers once the ANPR camera pulls their information. So, how does this work? Let’s take an example of the advanced Vidar ANPR/LPR camera by Adaptive Recognition. It sends signals directly to the gate/barrier. As a result, you won’t depend on any third-party software or hardware anymore. You can use the camera as a stand-alone gate controller to store an authorized and non-authorized list of license plates stored onboard.

However, people with less frequent visits must stop at the entry point and can go through the barrier once the guard presses a button in the control room. These entry and exit methods secure your location and provide complete visibility entering and leaving your car park.


Smart City Traffic During Night Monitored by ANPR Cameras
ANPR Cameras Revealed: What Are They Watching, and What Are They Good For?

Smart City and ANPR Cameras

Smart City projects can significantly benefit from ANPR cameras as these cameras remove the need for human intervention. Here are four ways automatic number plate recognition cameras can improve security and help in smart city development.

1. Restricted Access Control

ANPR cameras are efficient in tracking cars and pulling their records, but they have other use cases as well. For instance, the Einar vehicle access control camera can detect and enforce vehicles entering the low emission zones (LEZ) 24/7. With a vehicle processing rate nearing 100%, they offer a terrific value for money. In case a vehicle violates programmed permissions, Einar will inform law enforcement and share all relevant vehicle details with them.

2. Crucial For Law Enforcement

ANPR cameras can ease the job of law enforcement by tracking and analyzing number plates. When a car crosses an ANPR camera, it compares the car’s data against its number plate. Then the speed detection camera (or the mobile speed camera) informs law enforcement if the vehicle is wanted for any of the following reasons: previous criminal activity (e.g., vehicle theft, carjacking), speeding (e.g., in a school zone), or any traffic violation (e.g., driving under the influence)

Moreover, a purpose-made ANPR camera might be integrated with the law enforcement server to track vehicles of interest. These cameras pull number plate information and take adequate images in any light condition of the vehicle and its driver, making them efficient in a manhunt.

3. Toll Automation

Toll stations are notorious for causing traffic jams and highway accidents. Even if an efficient staff consistently monitors the toll station, the threat is still there when the driver has pulled over to receive a ticket against their payment. Sometimes, it becomes agonizing when the ticket doesn’t come out. Automatic number plate recognition can also serve the purpose of a traffic monitoring camera that mitigates accidents and traffic jams by reading license plates and generating a toll ticket. If ANPR cameras are connected with online payments, drivers can pay for their toll tickets without stopping, reducing traffic jams.

4. ANPR in Logistics

ANPR cameras can reduce transportation and logistics companies’ costs through their robust and innovative number plate reading technology. The license plate recognition camera installed at the exit point can record the departure time for a transport van and ping the transport company once its delivery reaches its destination. This innovation can remove the need for calling and confirming the delivery status for B2B logistics companies. However, if ANPR technology is widely accepted, it might make B2C deliveries simpler.

Any questions or inquiries? We’re here to support you every step of the way:


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