How to implement a real-time license plate recognition system using PHP and Redis

With the continuous growth of population and traffic volume, license plate recognition technology has become an important tool for modern traffic management. In the past, license plate recognition systems required setting up a separate server and using high-cost hardware equipment to capture and recognize license plate information. However, as technology advances, more affordable solutions are now available, including a combination of PHP and Redis.

Redis is a high-performance in-memory database that is widely used in various fields. PHP is a popular scripting language used for web development. Combining them creates an efficient, real-time license plate recognition system. In this article, we will introduce how to use PHP and Redis to implement a real-time license plate recognition system.

1. Download and install Redis

First, you need to install Redis on your server or local computer. You can download the latest version of the software from the official Redis website. The process of installing Redis depends on your operating system and configuration.

2. Connecting to Redis database

It is very easy to connect to Redis database in PHP. You can use the PECL extension or by compiling PHP source code. In order for the PHP script to connect to the Redis database, you need to call the Redis API and pass in the IP address, port number, and password of the Redis server.

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
$redis->auth('password');

If the password is not set, there is no need to pass in the third parameter.

3. Implementing license plate recognition

The implementation of license plate recognition requires the use of visual computing and pattern recognition technology. These techniques can be implemented using image processing libraries and artificial intelligence techniques. In order to simplify the implementation process, in this article, we will use API calls to implement real-time license plate recognition.

$plate = file_get_contents('http://api.example.com/recognize_plate?image=car.jpg');

In this example, the name of the API is "recognize_plate", which accepts the URL of a vehicle image and returns a string containing the license plate information.

4. Storing and retrieving license plate information

Once the license plate information is recognized and stored in Redis, you can use PHP code to retrieve it every time a request arrives. If your request matches the license plate number in Redis, the vehicle will be identified and processed. Otherwise, it will be rejected.

The following is a sample code using Redis:

if ($redis->exists($plate)) {
    echo "Welcome back!";
} else {
    $redis->set($plate, '1', 'EX', 3600); // 存储1小时
    echo "New car detected!";
}

In this example, if the license plate number already exists in Redis, the system will output "Welcome back!", otherwise the license plate number will be stored, And delete it from Redis after 1 hour.

5. Summary

Using PHP and Redis to implement a real-time license plate recognition system can greatly simplify the entire process. It can easily process vehicle images by calling API, and use Redis to store and retrieve license plate information. If you are developing such a system, we hope this article helps you.

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