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Use PHP to write camera call scripts to achieve real-time image capture

PHPzOriginal: 2023-07-31 19:53:48956browse

The use of cameras is becoming more and more common in modern life. We can use cameras for video chat, monitoring, face recognition, etc. kind of application. This article will introduce how to use PHP to write a camera calling script to realize the function of real-time image capture.

First of all, we need to understand the image processing library of PHP. Here we choose a widely used image processing library-GD library. The GD library provides a series of functions to operate images, including creating, modifying, saving images, etc.

Next, we need to install the GD library. Enter the following command in the terminal to install:

sudo apt-get install php-gd

After the installation is complete, we can start writing our scripts.

First, we create a file named capture.php as our PHP script file. In the script file we need to call the camera and get the image.

<?php
// 创建一个新的图像资源
$image = imagecreatetruecolor(640, 480);

// 调用摄像头并获取图像
$cam = file_get_contents("http://localhost:8080/?action=snapshot");

// 将图像写入到新建的图像资源中
imagejpeg($image, "snapshot.jpg");

// 释放图像资源
imagedestroy($image);

// 输出图像
header("Content-type: image/jpeg");
echo $cam;
?>

In the above code, we first create a new image resource $image, whose size is 640x480. Next, we use the file_get_contents function to call the camera and get the image, storing it in a variable called cam. Then, we use the imagejpeg function to write the image in the cam to the newly created image resource and store it as a snapshot.jpg file. Finally, we use the header function to output the image to the browser.

In the code below, we use a simple HTML form to call our capture.php script file.

<!DOCTYPE html>
<html>
<head>
    <title>实时图像捕捉</title>
</head>
<body>
    <img src="capture.php" alt="实时图像">
    <form method="POST" action="capture.php">
        <input type="submit" value="捕捉图像">
    </form>
</body>
</html>

In the above code, we use the "capture.php" file in the root directory as the src attribute of the img element to achieve real-time image display. At the same time, we placed a capture image button in a form and called the capture.php script file to capture the image by submitting the form.

Through the above code, we can use PHP to write a simple camera calling script to realize the real-time image capture function. You can save the above code as a php file, place it in your PHP server directory, and ensure the correct configuration of the camera. When you access this PHP file, you can obtain the camera image in real time.

Of course, the above code is just a simple example, you can modify and extend it according to your own needs. I hope this article will help you understand how to use PHP to write camera call scripts.

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